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Continuously tuneable single electrode pair liquid crystal optical vortex generators Nanophotonics (IF 7.5) Pub Date : 2024-04-18 Camron Nourshargh, Alec Xu, Patrick S. Salter, Martin J. Booth, Steve J. Elston, Stephen M. Morris
In this work, we demonstrate the use of two-photon polymerization direct laser writing in the production of continuously tuneable optical vortex beam (OV) generators in a liquid crystal (LC) layer sandwiched between glass substrates. Results are presented that show how an OV generator can be inscribed into a 20 μm-thick LC layer and how the order of the OV beam can be tuned with the application of
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Tunable high-order harmonic generation in GeSbTe nano-films Nanophotonics (IF 7.5) Pub Date : 2024-04-17 Viacheslav Korolev, Artem D. Sinelnik, Mikhail V. Rybin, Petr Lazarenko, Olga M. Kushchenko, Victoria Glukhenkaya, Sergey Kozyukhin, Michael Zuerch, Christian Spielmann, Thomas Pertsch, Isabelle Staude, Daniil Kartashov
High-order harmonic generation (HHG) in solids opens new frontiers in ultrafast spectroscopy of carrier and field dynamics in condensed matter, picometer resolution structural lattice characterization and designing compact platforms for attosecond pulse sources. Nanoscale structuring of solid surfaces provides a powerful tool for controlling the spatial characteristics and efficiency of the harmonic
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Silicon-based planar devices for narrow-band near-infrared photodetection using Tamm plasmons Nanophotonics (IF 7.5) Pub Date : 2024-04-17 Wenyue Liang, Yajin Dong, Long Wen, Yongbing Long
Designing efficient narrow-band near-infrared photodetectors integrated on silicon for telecommunications remains a significant challenge in silicon photonics. This paper proposes a novel silicon-based hot-electron photodetector employing Tamm plasmons (Si-based TP-HE PD) for narrow-band near-infrared photodetection. The device combines a one-dimensional photonic crystal (1DPC) structure, an Au layer
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Far-field mapping and efficient beaming of second harmonic by a plasmonic metagrating Nanophotonics (IF 7.5) Pub Date : 2024-04-16 Augustin Verneuil, Agostino Di Francescantonio, Attilio Zilli, Julien Proust, Jérémie Béal, Daniela Petti, Marco Finazzi, Michele Celebrano, Anne-Laure Baudrion
We study numerically and experimentally the second-harmonic generation (SHG) from rectangular metagratings of V-shaped gold nanoantennas. We show that by carefully engineering the array pitch to steer the diffraction orders toward the single antenna emission, the extracted signal is maximized. This enhancement is attributed to the angular overlap between the radiation pattern and array factor and is
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Emission engineering in microdisk lasers via direct integration of meta-micromirrors Nanophotonics (IF 7.5) Pub Date : 2024-04-16 Aran Yu, Moohyuk Kim, Da In Song, Byoung Jun Park, Hae Rin Jeong, Byeong Uk You, Seung-Woo Jeon, Sang-Wook Han, Myung-Ki Kim
Despite their excellent performance and versatility, the efficient integration of small lasers with other optical devices has long been hindered by their broad emission divergence. In this study, we introduce a novel approach for emission engineering in microdisk lasers, significantly enhancing their vertical emission output by directly integrating specially designed reflective metalenses, referred
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Extracting kinetic information from short-time trajectories: relaxation and disorder of lossy cavity polaritons Nanophotonics (IF 7.5) Pub Date : 2024-04-16 Andrew Wu, Javier Cerrillo, Jianshu Cao
The emerging field of molecular cavity polaritons has stimulated a surge of experimental and theoretical activities and presents a unique opportunity to develop the many-body simulation methodology. This paper presents a numerical scheme for the extraction of key kinetic information of lossy cavity polaritons based on the transfer tensor method (TTM). Steady state, relaxation timescales, and oscillatory
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Multistability manipulation by reinforcement learning algorithm inside mode-locked fiber laser Nanophotonics (IF 7.5) Pub Date : 2024-04-15 Alexey Kokhanovskiy, Evgeny Kuprikov, Kirill Serebrennikov, Aram Mkrtchyan, Ayvaz Davletkhanov, Alexey Bunkov, Dmitry Krasnikov, Mikhail Shashkov, Albert Nasibulin, Yuriy Gladush
Fiber mode-locked lasers are nonlinear optical systems that provide ultrashort pulses at high repetition rates. However, adjusting the cavity parameters is often a challenging task due to the intrinsic multistability of a laser system. Depending on the adjustment of the cavity parameters, the optical output may vary significantly, including Q-switching, single and multipulse, and harmonic mode-locked
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Nanolasers Nanophotonics (IF 7.5) Pub Date : 2024-04-13 Thomas Charles Ellis, Sahand Eslami, Stefano Palomba
As the demand for smaller and more compact lasers increases, the physical dimensions of laser diodes are already at the diffraction limit, which impairs this miniaturization trend and limits direct laser integration into photonic and especially nanophotonic circuits. However, plasmonics has allowed the development of a novel class of lasers that can be manufactured without being limited by diffraction
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Strong coupling in molecular systems: a simple predictor employing routine optical measurements Nanophotonics (IF 7.5) Pub Date : 2024-04-13 Marie S. Rider, Edwin C. Johnson, Demetris Bates, William P. Wardley, Robert H. Gordon, Robert D. J. Oliver, Steven P. Armes, Graham J. Leggett, William L. Barnes
We provide a simple method that enables readily acquired experimental data to be used to predict whether or not a candidate molecular material may exhibit strong coupling. Specifically, we explore the relationship between the hybrid molecular/photonic (polaritonic) states and the bulk optical response of the molecular material. For a given material, this approach enables a prediction of the maximum
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Inverse design of compact silicon photonic waveguide reflectors and their application for Fabry–Perot resonators Nanophotonics (IF 7.5) Pub Date : 2024-04-13 Yonghan Kim, Sung-Hoon Hong
Silicon photonic waveguide resonators, such as microring resonators, photonic crystal waveguide cavities, and Fabry–Perot resonators based on the distributed Bragg reflectors, are key device components for silicon-based photonic integrated circuits (Si-PIC). For the Si-PIC with high integration density, the device footprints of the conventional photonic waveguide resonators need to be more compact
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Hybrid plasmonic valley-Hall topological insulators Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Sam Lin, Zi Jing Wong
The emerging field of photonic topological insulators offers promising platforms for high-performance optical communication, computing, and sensing. However, conventional photonic topological insulator designs typically operate within the diffraction limit due to their dielectric nature. This limitation imposes constraints on device miniaturization, reduces light–matter interaction, and decreases overall
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Tunable on-chip optical traps for levitating particles based on single-layer metasurface Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Chuang Sun, Hailong Pi, Kian Shen Kiang, Tiberius S. Georgescu, Jun-Yu Ou, Hendrik Ulbricht, Jize Yan
Optically levitated multiple nanoparticles have emerged as a platform for studying complex fundamental physics such as non-equilibrium phenomena, quantum entanglement, and light–matter interaction, which could be applied for sensing weak forces and torques with high sensitivity and accuracy. An optical trapping landscape of increased complexity is needed to engineer the interaction between levitated
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Enhancing thermal stability of Nd:GGG WGM microdisk lasers via silica integration Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Huiqi Li, Zhaocong Wang, Lei Wang, Yang Tan, Feng Chen
Whispering gallery mode (WGM) resonators, as an integral component of integrated photonics, have attracted considerable attention due to their high Q factor, small footprint, and small mode volume, making them widely applied as microlasers. In this work, Nd:GGG crystal was prepared into a Nd:GGG film with thickness of 1.8 μm through ion implantation-enhanced etching (IIEE) technique, and subsequently
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Optical trapping and manipulating with a transmissive and polarization-insensitive metalens Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Dongni Yang, Jianchao Zhang, Pengshuai Zhang, Haowen Liang, Jie Ma, Juntao Li, Xue-Hua Wang
Trapping and manipulating micro-objects and achieving high-precision measurements of tiny forces and displacements are of paramount importance in both physical and biological research. While conventional optical tweezers rely on tightly focused beams generated by bulky microscope systems, the emergence of flat lenses, particularly metalenses, has revolutionized miniature optical tweezers applications
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Optically driven plasmons in graphene/hBN van der Waals heterostructures: simulating s-SNOM measurements Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Neven Golenić, Stefano de Gironcoli, Vito Despoja
Converting transverse photons into longitudinal two-dimensional plasmon-–polaritons (2D-PP) and vice versa presents a significant challenge within the fields of photonics and plasmonics. Therefore, understanding the mechanism which increases the photon – 2D-PP conversion efficiency could significantly contribute to those efforts. In this study, we theoretically examine how efficiently incident radiation
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Engineering topological interface states in metal-wire waveguides for broadband terahertz signal processing Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Mohammad Ghazialsharif, Junliang Dong, Domenico Bongiovanni, Anton Vorobiov, Ziteng Wang, Zhigang Chen, Detlef Kip, Roberto Morandotti
Innovative terahertz waveguides are in high demand to serve as a versatile platform for transporting and manipulating terahertz signals for the full deployment of future six-generation (6G) communication systems. Metal-wire waveguides have emerged as promising candidates, offering the crucial advantage of sustaining low-loss and low-dispersion propagation of broadband terahertz pulses. Recent advances
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From weak to strong coupling: quasi-BIC metasurfaces for mid-infrared light–matter interactions Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Shovasis Kumar Biswas, Wihan Adi, Aidana Beisenova, Samir Rosas, Eduardo Romero Arvelo, Filiz Yesilkoy
Thanks to their giant, yet tunable, Q-factor resonances, all-dielectric metasurfaces supporting the quasi-bound states in the continuum (q-BIC) resonances are well-suited to provide a promising platform for quantum-coherent light–matter interactions. Yet, the strong coupling regime, characterized by the hybrid light–matter states – polaritons, has not yet been fully explored in the mid-infrared regime
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Extracting accurate light–matter couplings from disordered polaritons Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Kai Schwennicke, Noel C. Giebink, Joel Yuen-Zhou
The vacuum Rabi splitting (VRS) in molecular polaritons stands as a fundamental measure of collective light–matter coupling. Despite its significance, the impact of molecular disorder on VRS is not fully understood yet. This study delves into the complexities of VRS amidst various distributions and degrees of disorder. Our analysis provides precise analytical expressions for linear absorption, transmission
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Focusing of mid-infrared polaritons through patterned graphene on van der Waals crystals Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Ruey-Tarng Liu, Yan-Ze Wu, Chia-Chien Huang
Manipulating the propagation of mid-infrared (mid-IR) light is crucial for optical imaging, biosensing, photocatalysis, and guiding photonic circuits. Artificially engineered metamaterials were introduced to comprehensively control optical waves. However, fabrication challenges and optical losses have impeded the progress. Fortunately, two-dimensional van der Waals (vdW) materials are alternatives
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Metallic photoluminescence of plasmonic nanoparticles in both weak and strong excitation regimes Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Xiaoguo Fang, Jiyong Wang, Min Qiu
The luminescent nature of plasmonic nanoparticles (NPs) has been intensively investigated in recent years. Plasmon-enhanced electronic Raman scattering and the radiation channels of metallic photoluminescence (PL) involving conventional carrier recombinations and emergent particle plasmons are proposed in the past few decades but largely limited to weak excitation regimes. Here, we systematically examine
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Nonlocal effects in plasmon-emitter interactions Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Mikkel Have Eriksen, Christos Tserkezis, N. Asger Mortensen, Joel D. Cox
Nonlocal and quantum mechanical phenomena in noble metal nanostructures become increasingly crucial when the relevant length scales in hybrid nanostructures reach the few-nanometer regime. In practice, such mesoscopic effects at metal–dielectric interfaces can be described using exemplary surface-response functions (SRFs) embodied by the Feibelman d-parameters. Here we show that SRFs dramatically influence
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Toward “super-scintillation” with nanomaterials and nanophotonics Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Hamish Carr Delgado, Parivash Moradifar, Garry Chinn, Craig S. Levin, Jennifer A. Dionne
Following the discovery of X-rays, scintillators are commonly used as high-energy radiation sensors in diagnostic medical imaging, high-energy physics, astrophysics, environmental radiation monitoring, and security inspections. Conventional scintillators face intrinsic limitations including a low extraction efficiency of scintillated light and a low emission rate, leading to efficiencies that are less
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Color arrestor pixels for high-fidelity, high-sensitivity imaging sensors Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Mingwan Cho, Joonkyo Jung, Myungjoon Kim, Jeong Yub Lee, Seokhwan Min, Jongwoo Hong, Shinho Lee, Minsung Heo, Jong Uk Kim, In-Sung Joe, Jonghwa Shin
Silicon is the dominant material in complementary metal-oxide-semiconductor (CMOS) imaging devices because of its outstanding electrical and optical properties, well-established fabrication methods, and abundance in nature. However, with the ongoing trend toward electronic miniaturization, which demands smaller pixel sizes in CMOS image sensors, issues, such as crosstalk and reduced optical efficiency
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Gouy phase effects on photocurrents in plasmonic nanogaps driven by single-cycle pulses Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Andrea Rossetti, Matthias Falk, Alfred Leitenstorfer, Daniele Brida, Markus Ludwig
The investigation of optical phenomena in the strong-field regime requires few-cycle laser pulses at field strengths exceeding gigavolts per meter (GV/m). Surprisingly, such conditions can be reached by tightly focusing pJ-level pulses with nearly octave spanning optical bandwidth onto plasmonic nanostructures, exploiting the field-enhancement effect. In this situation, the Gouy phase of the focused
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Strong coupling between WS2 monolayer excitons and a hybrid plasmon polariton at room temperature Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Yuhao Zhang, Hans-Joachim Schill, Stephan Irsen, Stefan Linden
Light–matter interactions between plasmonic and excitonic modes have attracted considerable interest in recent years. A major challenge in achieving strong coupling is the identification of suitable metallic nanostructures that combine tight field confinement with sufficiently low losses. Here, we report on a room-temperature study on the interaction of tungsten disulfide (WS2) monolayer excitons with
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Simultaneous generation of first- to fourth-order OAM modes based on a cascaded preset-twist long-period fiber grating Nanophotonics (IF 7.5) Pub Date : 2024-04-12 Wenzhe Chang, Yan-ge Liu, Zekun Shi, Huiyi Guo, Xin Wang, Pan Wang, Zhi Wang
We propose and demonstrate the simulation and fabrication of an all-fiber orbital angular momentum (OAM) mode converter capable of generating first- to fourth-order modes simultaneously, which is realized by inscribing a cascaded preset-twist long-period fiber grating (CPT-LPFG) in a six-mode fiber utilizing a CO2 laser. A new segmented Runge–Kutta method is proposed to simulate the preset-twist long-period
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On-chip wavelength division multiplexing by angled multimode interferometer fabricated on erbium-doped thin film lithium niobate on insulator Nanophotonics (IF 7.5) Pub Date : 2024-04-04 Jinli Han, Rui Bao, Rongbo Wu, Zhaoxiang Liu, Zhe Wang, Chao Sun, Zhihao Zhang, Mengqi Li, Zhiwei Fang, Min Wang, Haisu Zhang, Ya Cheng
Photonic-integrated circuits based on erbium-doped thin film lithium niobate on insulator has attracted broad interests with insofar various waveguide amplifiers and microlasers demonstrated. Wideband operation facilitated by the broadband absorption and emission of erbium ions necessitates the functional integration of wavelength filter and multiplexer on the same chip. Here, a low-loss wavelength
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Photon-assisted ultrafast electron–hole plasma expansion in direct band semiconductors Nanophotonics (IF 7.5) Pub Date : 2024-03-27 Tinkara Troha, Filip Klimovič, Tomáš Ostatnický, Hynek Němec, Petr Kužel
Time-resolved terahertz spectroscopy is used to investigate formation and ultrafast long-distance propagation of electron–hole plasma in strongly photoexcited GaAs and InP. The observed phenomena involve fundamental interactions of electron–hole system with light, which manifest themselves in two different regimes: a coherent one with the plasma propagation speeds up to c/10 (in GaAs at 20 K) and an
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Molecular scale nanophotonics: hot carriers, strong coupling, and electrically driven plasmonic processes Nanophotonics (IF 7.5) Pub Date : 2024-03-27 Yunxuan Zhu, Markus B. Raschke, Douglas Natelson, Longji Cui
Plasmonic modes confined to metallic nanostructures at the atomic and molecular scale push the boundaries of light–matter interactions. Within these extreme plasmonic structures of ultrathin nanogaps, coupled nanoparticles, and tunnelling junctions, new physical phenomena arise when plasmon resonances couple to electronic, exitonic, or vibrational excitations, as well as the efficient generation of
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Fast-speed and low-power-consumption optical phased array based on lithium niobate waveguides Nanophotonics (IF 7.5) Pub Date : 2024-03-27 Zhizhang Wang, Xueyun Li, Jitao Ji, Zhenxing Sun, Jiacheng Sun, Bin Fang, Jun Lu, Shaobo Li, Xiang Ma, Xiangfei Chen, Shining Zhu, Tao Li
Fast scanning speed and low-power consumption are becoming progressively more and more important in realizing high-performance chiplet optical phased arrays (OPAs). Here, we successfully demonstrated integrated OPAs with multiple waveguides channels based on thin-film lithium niobate-on-insulator (LNOI) platform. Specifically, two lithium niobate (LN) OPA chips have been implemented with 32 and 48
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Transfer learning for metamaterial design and simulation Nanophotonics (IF 7.5) Pub Date : 2024-03-22 Rixi Peng, Simiao Ren, Jordan Malof, Willie J. Padilla
We demonstrate transfer learning as a tool to improve the efficacy of training deep learning models based on residual neural networks (ResNets). Specifically, we examine its use for study of multi-scale electrically large metasurface arrays under open boundary conditions in electromagnetic metamaterials. Our aim is to assess the efficiency of transfer learning across a range of problem domains that
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High-speed data transmission over a microresonator frequency comb with dispersion compensation for augmented data rates and reach Nanophotonics (IF 7.5) Pub Date : 2024-03-22 Kenny Y. K. Ong, Aadhi Abdul Rahim, Xavier X. Chia, George. F. R. Chen, Peng Xing, Dawn T. H. Tan
Microresonator frequency comb-based high-speed data transmission provides a pathway towards augmented data capacity without increasing the number of laser sources. Their use with intensity-modulated direct detection modulation (IMDD) formats is especially pertinent in data center communications where minimizing cost, latency and complexity is paramount. This however implies that the same extent of
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Bayesian optimization of Fisher Information in nonlinear multiresonant quantum photonics gyroscopes Nanophotonics (IF 7.5) Pub Date : 2024-03-22 Mengdi Sun, Vassilios Kovanis, Marko Lončar, Zin Lin
We propose an on-chip gyroscope based on nonlinear multiresonant optics in a thin film χ (2) resonator that combines high sensitivity, compact form factor, and low power consumption simultaneously. We theoretically analyze a novel holistic metric – Fisher Information capacity of a multiresonant nonlinear photonic cavity – to fully characterize the sensitivity of our gyroscope under fundamental quantum
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Snapshot spectral imaging: from spatial-spectral mapping to metasurface-based imaging Nanophotonics (IF 7.5) Pub Date : 2024-03-22 Kaiyang Ding, Ming Wang, Mengyuan Chen, Xiaohao Wang, Kai Ni, Qian Zhou, Benfeng Bai
Snapshot spectral imaging technology enables the capture of complete spectral information of objects in an extremely short period of time, offering wide-ranging applications in fields requiring dynamic observations such as environmental monitoring, medical diagnostics, and industrial inspection. In the past decades, snapshot spectral imaging has made remarkable breakthroughs with the emergence of new
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Subradiant plasmonic cavities make bright polariton states dark Nanophotonics (IF 7.5) Pub Date : 2024-03-22 Ju Eun Yim, Zachary T. Brawley, Matthew T. Sheldon
Nanostructured plasmonic surfaces allow for precise tailoring of electromagnetic modes within sub-diffraction mode volumes, boosting light–matter interactions. This study explores vibrational strong coupling (VSC) between molecular ensembles and subradiant “dark” cavities that support infrared quadrupolar plasmonic resonances (QPLs). The QPL mode exhibits a dispersion characteristic of bound states
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Deep-subwavelength multilayered meta-coatings for visible-infrared compatible camouflage Nanophotonics (IF 7.5) Pub Date : 2024-03-21 Chong Tan, Zhengji Wen, Jinguo Zhang, Dongjie Zhou, Qianli Qiu, Meikang Han, Yan Sun, Ning Dai, Jiaming Hao
Camouflage is a common technique in nature, enabling organisms to protect themselves from predators. The development of novel camouflage technologies, not only in fundamental science, but also in the fields of military and civilian applications, is of great significance. In this study, we propose a new type of deep-subwavelength four-layered meta-coating consisting of Si, Bi, Si, and Cr from top to
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Plasmonic electro-optic modulators on lead zirconate titanate platform Nanophotonics (IF 7.5) Pub Date : 2024-03-21 Torgom Yezekyan, Martin Thomaschewski, Paul Conrad Vaagen Thrane, Sergey I. Bozhevolnyi
The advancement in material platforms exhibiting strong and robust electro-optic effects is crucial for further progress in developing highly efficient and miniaturized optoelectronic components with low power consumption for modern optical communication systems. In this work, we investigate thin-film lead zirconate titanate (PZT) substrates grown by a chemical solution deposition technique as a potential
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Closed-loop electron-beam-induced spectroscopy and nanofabrication around individual quantum emitters Nanophotonics (IF 7.5) Pub Date : 2024-03-21 Jawaher Almutlaq, Kyle P. Kelley, Hyeongrak Choi, Linsen Li, Benjamin Lawrie, Ondrej Dyck, Dirk Englund, Stephen Jesse
Color centers in diamond play a central role in the development of quantum photonic technologies, and their importance is only expected to grow in the near future. For many quantum applications, high collection efficiency from individual emitters is required, but the refractive index mismatch between diamond and air limits the optimal collection efficiency with conventional diamond device geometries
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Photo-thermo-optical modulation of Raman scattering from Mie-resonant silicon nanostructures Nanophotonics (IF 7.5) Pub Date : 2024-03-20 Mor Pal Vikram, Kentaro Nishida, Chien-Hsuan Li, Daniil Riabov, Olesiya Pashina, Yu-Lung Tang, Sergey V. Makarov, Junichi Takahara, Mihail I. Petrov, Shi-Wei Chu
Raman scattering is sensitive to local temperature and thus offers a convenient tool for non-contact and non-destructive optical thermometry at the nanoscale. In turn, all-dielectric nanostructures, such as silicon particles, exhibit strongly enhanced photothermal heating due to Mie resonances, which leads to the strong modulation of elastic Rayleigh scattering intensity through subsequent thermo-optical
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Investigating the collective nature of cavity-modified chemical kinetics under vibrational strong coupling Nanophotonics (IF 7.5) Pub Date : 2024-03-18 Lachlan P. Lindoy, Arkajit Mandal, David R. Reichman
In this paper, we develop quantum dynamical methods capable of treating the dynamics of chemically reacting systems in an optical cavity in the vibrationally strong-coupling (VSC) limit at finite temperatures and in the presence of a dissipative solvent in both the few and many molecule limits. In the context of two simple models, we demonstrate how reactivity in the collective VSC regime does not
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THz graphene-integrated metasurface for electrically reconfigurable polarization conversion Nanophotonics (IF 7.5) Pub Date : 2024-03-18 Li-Zhao Song, Andrew Squires, Timothy van der Laan, Jia Du
Terahertz (THz) waves have been widely hailed as a key enabling technology for future sixth generation (6G) wireless networks. Dynamic modulation of their polarization states is of great attraction for high-capacity communications and anisotropic sensing. The development of such technology is, however, still in very early stage owing to the difficulties of realizing electrical reconfigurability for
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Photothermal spectroscopy on-chip sensor for the measurement of a PMMA film using a silicon nitride micro-ring resonator and an external cavity quantum cascade laser Nanophotonics (IF 7.5) Pub Date : 2024-03-15 Giovanna Ricchiuti, Anton Walsh, Jesús Hernán Mendoza-Castro, Artem S. Vorobev, Maria Kotlyar, Gustavo V. B. Lukasievicz, Simone Iadanza, Marco Grande, Bernhard Lendl, Liam O’Faolain
Laser-based mid-infrared (mid-IR) photothermal spectroscopy (PTS) represents a selective, fast, and sensitive analytical technique. Recent developments in laser design permits the coverage of wider spectral regions in combination with higher power, enabling for qualitative reconstruction of broadband absorption features, typical of liquid or solid samples. In this work, we use an external cavity quantum
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Deciphering between enhanced light emission and absorption in multi-mode porphyrin cavity polariton samples Nanophotonics (IF 7.5) Pub Date : 2024-03-14 Elizabeth O. Odewale, Aleksandr G. Avramenko, Aaron S. Rury
It remains unclear how the collective strong coupling of cavity-confined photons to the electronic transitions of molecular chromophore leverages the distinct properties of the polaritonic constituents for future technologies. In this study, we design, fabricate, and characterize multiple types of Fabry-Pérot (FP) mirco-resonators containing copper(II) tetraphenyl porphyrin (CuTPP) to show how cavity
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Spintronic terahertz metasurface emission characterized by scanning near-field nanoscopy Nanophotonics (IF 7.5) Pub Date : 2024-03-13 Mingcong Dai, Jiahua Cai, Zejun Ren, Mingxuan Zhang, Jiaqi Wang, Hongting Xiong, Yihang Ma, Youwei Wang, Sitong Zhou, Kuiju Li, Zhentao Lv, Xiaojun Wu
Understanding the ultrafast excitation, detection, transportation, and manipulation of nanoscale spin dynamics in the terahertz (THz) frequency range is critical to developing spintronic THz optoelectronic nanodevices. However, the diffraction limitation of the sub-millimeter waves – THz wavelengths – has impaired experimental investigation of spintronic THz nano-emission. Here, we present an approach
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Metasurface with all-optical tunability for spatially-resolved and multilevel thermal radiation Nanophotonics (IF 7.5) Pub Date : 2024-03-13 Shuhui Jiao, Kang Zhao, Jianhui Jiang, Kailin Zhao, Qin Guo, Jingbo Wang, Yansong Zhang, Gang Chen, Qian Cheng, Pei Zuo, Weina Han
Manipulating the thermal emission in the infrared (IR) range significantly impacts both fundamental scientific research and various technological applications, including IR thermal camouflage, information encryption, and radiative cooling. While prior research has put forth numerous materials and structures for these objectives, the significant challenge lies in attaining spatially resolved and dynamically
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Nonlinear optical response of strain-mediated gallium arsenide microwire in the near-infrared region Nanophotonics (IF 7.5) Pub Date : 2024-03-13 Xiangpeng Cui, Wenjun Huo, Linlu Qiu, Likang Zhao, Junjie Wang, Fei Lou, Shuaiyi Zhang, Vladislav Khayrudinov, Wing Yim Tam, Harri Lipsanen, He Yang, Xia Wang
Gallium arsenide (GaAs) semiconductor wires have emerged as potent candidates for nonlinear optical devices, necessitating bandgap engineering for an expanded operational wavelength range. We report the successful growth of strain-mediated GaAs microwires (MWs) with an average diameter of 1.1 μm. The axial tensile strain in these wires, as measured by X-ray diffraction and Raman scattering, ranges
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Efficient second-harmonic generation of quasi-bound states in the continuum in lithium niobate thin film enhanced by Bloch surface waves Nanophotonics (IF 7.5) Pub Date : 2024-03-13 Yun Lin, Yong Ye, Ziliang Fang, Bingyu Chen, Haoran Zhang, Tiefeng Yang, Yuming Wei, Yunxia Jin, Fanyu Kong, Gangding Peng, Hongchao Cao, Heyuan Guan, Huihui Lu
Nonlinear optics has generated a wide range of applications in the fields of optical communications, biomedicine, and materials science, with nonlinear conversion efficiency serving as a vital metric for its progress. However, the weak nonlinear response of materials, high optical loss, and inhomogeneous distribution of the light field hamper the improvement of the conversion efficiency. We present
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Preparation of amorphous silicon-doped Y2O3 aerogel enabling nonlinear optical features for ultrafast photonics Nanophotonics (IF 7.5) Pub Date : 2024-03-12 Qingxi Zhao, Hongwei Chu, Zhongben Pan, Benxue Liu, Han Pan, Shengzhi Zhao, Dechun Li
Amorphous aerogels with the microscopic nanoscale three-dimensional meshes provide superb platforms for investigating unique physicochemical properties. In order to enhance the physical, thermal and mechanical performances, one efficient and common approach is integrating diverse functional materials. Herein, we report a simple strategy to fabricate the amorphous silicon doped Y2O3 aerogels with the
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Metrology of frequency comb sources: assessing the coherence, from multimode to mode-locked operation Nanophotonics (IF 7.5) Pub Date : 2024-03-12 Roberto Eramo, Alessia Sorgi, Tecla Gabbrielli, Giacomo Insero, Francesco Cappelli, Luigi Consolino, Paolo De Natale
Since the beginning of this millennium, frequency comb generators have reshaped frequency metrology and related areas. After more than two decades since their first realization, several other ways to generate frequency combs, in any spectral region, have been demonstrated, each way with its peculiar features. This trend has triggered the need to quantitatively assess how close the new comb realizations
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Strongly coupled spins of silicon-vacancy centers inside a nanodiamond with sub-megahertz linewidth Nanophotonics (IF 7.5) Pub Date : 2024-03-12 Marco Klotz, Richard Waltrich, Niklas Lettner, Viatcheslav N. Agafonov, Alexander Kubanek
The search for long-lived quantum memories, which can be efficiently interfaced with flying qubits, is longstanding. One possible solution is to use the electron spin of a color center in diamond to mediate interaction between a long-lived nuclear spin and a photon. Realizing this in a nanodiamond furthermore facilitates the integration into photonic devices and enables the realization of hybrid quantum
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Dry synthesis of bi-layer nanoporous metal films as plasmonic metamaterial Nanophotonics (IF 7.5) Pub Date : 2024-03-12 Vincenzo Caligiuri, Hyunah Kwon, Andrea Griesi, Yurii P. Ivanov, Andrea Schirato, Alessandro Alabastri, Massimo Cuscunà, Gianluca Balestra, Antonio De Luca, Tlek Tapani, Haifeng Lin, Nicolò Maccaferri, Roman Krahne, Giorgio Divitini, Peer Fischer, Denis Garoli
Nanoporous metals are a class of nanostructured materials finding extensive applications in multiple fields thanks to their unique properties attributed to their high surface area and interconnected nanoscale ligaments. They can be prepared following different strategies, but the deposition of an arbitrary pure porous metal is still challenging. Recently, a dry synthesis of nanoporous films based on
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Fundamental absorption bandwidth to thickness limit for transparent homogeneous layers Nanophotonics (IF 7.5) Pub Date : 2024-03-08 Willie J. Padilla, Yang Deng, Omar Khatib, Vahid Tarokh
Past work has considered the analytic properties of the reflection coefficient for a metal-backed slab. The primary result established a fundamental relationship for the minimal layer thickness to bandwidth ratio achievable for an absorber. There has yet to be establishment of a similar relationship for non-metal-backed layers, and here we present the universal result based on the Kramers–Kronig relations
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Optimization of a programmable λ/2-pitch optical phased array Nanophotonics (IF 7.5) Pub Date : 2024-03-08 Ankita Sharma, John N. Straguzzi, Tianyuan Xue, Alperen Govdeli, Fu Der Chen, Andrei Stalmashonak, Wesley D. Sacher, Joyce K. S. Poon
A challenge in optical phased arrays (OPAs) is to achieve single-lobe emission using densely spaced emitters without incurring inter-waveguide optical crosstalk. Here, we propose to heuristically optimize the amplitude and phase of each grating antenna in an OPA to correct for optical non-idealities, including fabrication variations and inter-waveguide crosstalk. This method was applied to a silicon
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Holographic communication using programmable coding metasurface Nanophotonics (IF 7.5) Pub Date : 2024-03-08 Fan Zhang, Chaohui Wang, Weike Feng, Tong Liu, Zhengjie Wang, Yanzhao Wang, Mingzhao Wang, He-Xiu Xu
With rapid development of holography, metasurface-based holographic communication scheme shows great potential in development of adaptive electromagnetic function. However, conventional passive metasurfaces are severely limited by poor reconfigurability, which makes it difficult to achieve wavefront manipulations in real time. Here, we propose a holographic communication strategy that on-demand target
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Merging toroidal dipole bound states in the continuum without up-down symmetry in Lieb lattice metasurfaces Nanophotonics (IF 7.5) Pub Date : 2024-03-07 Guodong Zhu, Sen Yang, Justus C. Ndukaife
The significance of bound states in the continuum (BICs) lies in their potential for theoretically infinite quality factors. However, their actual quality factors are limited by imperfections in fabrication, which lead to coupling with the radiation continuum. In this study, we present a novel approach to address this issue by introducing a merging BIC regime based on a Lieb lattice. By utilizing this
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Thermalization rate of polaritons in strongly-coupled molecular systems Nanophotonics (IF 7.5) Pub Date : 2024-03-07 Evgeny A. Tereshchenkov, Ivan V. Panyukov, Mikhail Misko, Vladislav Y. Shishkov, Evgeny S. Andrianov, Anton V. Zasedatelev
Polariton thermalization is a key process in achieving light–matter Bose–Einstein condensation, spanning from solid-state semiconductor microcavities at cryogenic temperatures to surface plasmon nanocavities with molecules at room temperature. Originated from the matter component of polariton states, the microscopic mechanisms of thermalization are closely tied to specific material properties. In this
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Multifunctional all-dielectric quarter-wave plate metasurfaces for generating focused vector beams of Bell-like states Nanophotonics (IF 7.5) Pub Date : 2024-03-06 Guosen Cui, Manna Gu, Chen Cheng, Ziheng Zhang, Yuxiang Zhou, Qingrui Dong, Song Gao, Duk-Yong Choi, Chuanfu Cheng, Chunxiang Liu
The generation of vector beams using metasurfaces is crucial for the manipulation of light fields and has significant application potential, ranging from classical physics to quantum science. This paper introduces a novel dielectric metasurface composed of quarter-wave plate (QWP) meta-atoms, known as a QWP metasurface, designed to generate focused vector beams (VBs) of Bell-like states under right
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Hollow core optical fiber enabled by epsilon-near-zero material Nanophotonics (IF 7.5) Pub Date : 2024-03-06 Leon Zhang, Stuart Love, Aleksei Anopchenko, Ho Wai Howard Lee
Hollow core optical fibers of numerous guiding mechanisms have been studied in the past decades for their advantages on guiding light in air core. This work demonstrates a new hollow core optical fiber based on a different guiding mechanism, which confines light with a cladding made of epsilon-near-zero (ENZ) material through total internal reflection. We show that the addition of a layer of ENZ material
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Recent advances in SERS-based bioanalytical applications: live cell imaging Nanophotonics (IF 7.5) Pub Date : 2024-03-05 Dong-Kwon Lim, Panangattukara Prabhakaran Praveen Kumar
Raman scattering can provide information on molecular fingerprints, which have been widely applied in various fields of material science and nanobiotechnology. Notably, low interference with water molecules in obtaining the Raman spectra between 500 and 2000 cm−1 made it a powerful spectroscopic tool in biology, such as imaging and signaling for a living cell. To be a robust tool for cell biology,
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Observation of tunable accidental bound state in the continuum in silicon nanodisk array Nanophotonics (IF 7.5) Pub Date : 2024-03-05 Yingying Han, Lei Xiong, Jianping Shi, Guangyuan Li
We experimentally demonstrate the tuning of accidental bound states in the continuum (A-BICs) in silicon nanodisk arrays. The A-BIC emerges of the destructive interference of multipoles, which are the dominating out-of-plane electric dipole and in-plane magnetic dipole, and weak electric quadrupole and magnetic quadrupole. We further show that the spectral and angular position of the A-BIC can be conveniently