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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
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Structural-color meta-nanoprinting embedding multi-domain spatial light field information Nanophotonics (IF 7.5) Pub Date : 2024-03-05 Congling Liang, Jiahao Wang, Tian Huang, Qi Dai, Zile Li, Shaohua Yu, Gongfa Li, Guoxing Zheng
Recently, multifunctional metasurface has showcased its powerful functionality to integrate nanoprinting and holography, and display ultracompact meta-images in near- and far-field simultaneously. Herein, we propose a tri-channel metasurface which can further extend the meta-imaging ranges, with three independent images located at the interface, Fresnel and Fourier domains, respectively. Specifically
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Development and mechanisms of photo-induced molecule junction device Nanophotonics (IF 7.5) Pub Date : 2024-03-05 Xin Sun, Ran Liu, Sneha Kandapal, Bingqian Xu
The utilization of single molecule electronic devices represents a significant avenue toward advancing next-generation circuits. Recent investigations have notably augmented our understanding of the optoelectronic characteristics exhibited by diverse single molecule materials. This comprehensive review underscores the latest progressions in probing photo-induced electron transport behaviors within
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Momentum space separation of quantum path interferences between photons and surface plasmon polaritons in nonlinear photoemission microscopy Nanophotonics (IF 7.5) Pub Date : 2024-03-02 Pascal Dreher, David Janoschka, Harald Giessen, Ralf Schützhold, Timothy J. Davis, Michael Horn-von Hoegen, Frank-J. Meyer zu Heringdorf
Quantum path interferences occur whenever multiple equivalent and coherent transitions result in a common final state. Such interferences strongly modify the probability of a particle to be found in that final state, a key concept of quantum coherent control. When multiple nonlinear and energy-degenerate transitions occur in a system, the multitude of possible quantum path interferences is hard to
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Isotopic effects on in-plane hyperbolic phonon polaritons in MoO3 Nanophotonics (IF 7.5) Pub Date : 2024-03-01 Jeremy F. Schultz, Sergiy Krylyuk, Jeffrey J. Schwartz, Albert V. Davydov, Andrea Centrone
Hyperbolic phonon polaritons (HPhPs), hybrids of light and lattice vibrations in polar dielectric crystals, empower nanophotonic applications by enabling the confinement and manipulation of light at the nanoscale. Molybdenum trioxide (α-MoO3) is a naturally hyperbolic material, meaning that its dielectric function deterministically controls the directional propagation of in-plane HPhPs within its reststrahlen
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Spintronic terahertz emitters with integrated metallic terahertz cavities Nanophotonics (IF 7.5) Pub Date : 2024-03-01 Martin Mičica, Adrien Wright, Pierre Koleják, Geoffrey Lezier, Kamil Postava, Jacques Hawecker, Anna De Vetter, Jerome Tignon, Juliette Mangeney, Henri Jaffres, Romain Lebrun, Nicolas Tiercelin, Mathias Vanwolleghem, Sukhdeep Dhillon
Spintronic terahertz emitters (STEs), based on optical excitation of nanometer thick ferromagnetic/heavy metal (FM/HM) heterojunctions, have become important sources for the generation of terahertz (THz) pulses. However, the efficiency of the optical-to-THz conversion remains limited. Although optical techniques have been developed to enhance the optical absorption, no investigations have studied the
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Longitudinally continuous varying high-order cylindrical vector fields enabled by spin-decoupled metasurfaces Nanophotonics (IF 7.5) Pub Date : 2024-03-01 Xinye He, Hanlin Bao, Fei Zhang, Tongtong Kang, Mingbo Pu, Yan Chen, Yinghui Guo, Jintao Gong, Mingfeng Xu, Xiangang Luo
The manipulation of vector optical fields in three-dimensional (3D) space plays a vital role in both fundamental research and practical implementations of polarization optics. However, existing studies mostly focus on 3D vector optical fields with limited modes. Here, an approach of spin-decoupled spatial partitioning is proposed to generate complex 3D vector optical fields with a customizable number
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Experimental demonstration of a photonic reservoir computing system based on Fabry Perot laser for multiple tasks processing Nanophotonics (IF 7.5) Pub Date : 2024-03-01 Xingxing Guo, Hanxu Zhou, Shuiying Xiang, Qian Yu, Yahui Zhang, Yanan Han, Tao Wang, Yue Hao
Photonic reservoir computing (RC) is a simple and efficient neuromorphic computing framework for human cortical circuits, which is featured with fast training speed and low training cost. Photonic time delay RC, as a simple hardware implementation method of RC, has attracted widespread attention. In this paper, we present and experimentally demonstrate a time delay RC system based on a Fabry Perot
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Advanced visual components inspired by animal eyes Nanophotonics (IF 7.5) Pub Date : 2024-02-29 Sehui Chang, Duk-Jo Kong, Young Min Song
Artificial vision systems pervade our daily lives as a foremost sensing apparatus in various digital technologies, from smartphones to autonomous cars and robotics. The broad range of applications for conventional vision systems requires facile adaptation under extreme and dynamic visual environments. However, these current needs have complicated individual visual components for high-quality image
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Harmonic quantum cascade laser terahertz frequency combs enabled by multilayer graphene top-cavity scatters Nanophotonics (IF 7.5) Pub Date : 2024-02-28 Manuel Alejandro Justo Guerrero, Omer Arif, Lucia Sorba, Miriam Serena Vitiello
Optical frequency comb synthesizers, operating in the harmonic regime, are metrological sources in which the emitted optical power is concentrated in a few modes, spaced by several multiples of the cavity free spectral range (FSR). This behavior reflects in a large correlation degree and, in principle, in an increased optical power per mode. In miniaturized quantum cascade lasers (QCLs), harmonic frequency
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Unleashing the potential: AI empowered advanced metasurface research Nanophotonics (IF 7.5) Pub Date : 2024-02-27 Yunlai Fu, Xuxi Zhou, Yiwan Yu, Jiawang Chen, Shuming Wang, Shining Zhu, Zhenlin Wang
In recent years, metasurface, as a representative of micro- and nano-optics, have demonstrated a powerful ability to manipulate light, which can modulate a variety of physical parameters, such as wavelength, phase, and amplitude, to achieve various functions and substantially improve the performance of conventional optical components and systems. Artificial Intelligence (AI) is an emerging strong and
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Fourier imaging for nanophotonics Nanophotonics (IF 7.5) Pub Date : 2024-02-27 Sébastien Cueff, Lotfi Berguiga, Hai Son Nguyen
Standard optical characterization and spectroscopy techniques rely on the measurement of specular reflection, transmission, or emission at normal incidence. Although the usefulness of these methods is without question, they do not provide information on the angular dependence of the scattered light and, therefore, miss crucial insights on the physical processes governing light emission and scattering
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Electrically tunable plasmonic metasurface as a matrix of nanoantennas Nanophotonics (IF 7.5) Pub Date : 2024-02-27 Luis Angel Mayoral Astorga, Masoud Shabaninezhad, Howard Northfield, Spyridon Ntais, Sabaa Rashid, Ewa Lisicka-Skrzek, Hamid Mehrvar, Eric Bernier, Dominic Goodwill, Lora Ramunno, Pierre Berini
We report the fabrication and characterization of a plasmonic metasurface comprising electrically-contacted sub-wavelength gold dipole nanoantennas, conformally coated by a thin hafnia film, an indium tin oxide layer and a backside mirror, forming metal–oxide–semiconductor (MOS) capacitors, for use as an electrically-tunable reflectarray or metasurface. By voltage biasing the nanoantennas through metallic
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Sample-efficient inverse design of freeform nanophotonic devices with physics-informed reinforcement learning Nanophotonics (IF 7.5) Pub Date : 2024-02-27 Chaejin Park, Sanmun Kim, Anthony W. Jung, Juho Park, Dongjin Seo, Yongha Kim, Chanhyung Park, Chan Y. Park, Min Seok Jang
Finding an optimal device structure in the vast combinatorial design space of freeform nanophotonic design has been an enormous challenge. In this study, we propose physics-informed reinforcement learning (PIRL) that combines the adjoint-based method with reinforcement learning to improve the sample efficiency by an order of magnitude compared to conventional reinforcement learning and overcome the
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Colored thermal camouflage and anti-counterfeiting with programmable In3SbTe2 platform Nanophotonics (IF 7.5) Pub Date : 2024-02-27 Sihong Zhou, Shikui Dong, Yanming Guo, Yong Shuai, He-Xiu Xu, Guangwei Hu
Camouflage is an important technology in various scenarios. Usually, this involves the visible compatibility of the background, which however is facile under infrared thermal radiation detection. The simultaneous visible and thermal camouflage are challenging because it requires full and decoupled manipulations of visible reflection and infrared emissivity using one single device, let alone to its
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Electron-assisted probing of polaritonic light–matter states Nanophotonics (IF 7.5) Pub Date : 2024-02-26 Jaime Abad-Arredondo, Antonio I. Fernández-Domínguez
Thanks to their exceptional spatial, spectral and temporal resolution, highly-coherent free-electron beams have emerged as powerful probes for material excitations, enabling their characterization even in the quantum regime. Here, we investigate strong light–matter coupling through monochromatic and modulated electron wavepackets. In particular, we consider an archetypal target, comprising a nanophotonic
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Directional spontaneous emission in photonic crystal slabs Nanophotonics (IF 7.5) Pub Date : 2024-02-24 Erik P. Navarro-Barón, Herbert Vinck-Posada, Alejandro González-Tudela
Spontaneous emission is one of the most fundamental out-of-equilibrium processes in which an excited quantum emitter relaxes to the ground state due to quantum fluctuations. In this process, a photon is emitted that can interact with other nearby emitters and establish quantum correlations between them, e.g., via super and subradiance effects. One way to modify these photon-mediated interactions is
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Resonance theory of vibrational polariton chemistry at the normal incidence Nanophotonics (IF 7.5) Pub Date : 2024-02-23 Wenxiang Ying, Michael A. D. Taylor, Pengfei Huo
We present a theory that explains the resonance effect of the vibrational strong coupling (VSC) modified reaction rate constant at the normal incidence of a Fabry–Pérot (FP) cavity. This analytic theory is based on a mechanistic hypothesis that cavity modes promote the transition from the ground state to the vibrational excited state of the reactant, which is the rate-limiting step of the reaction
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Topological phase transition and surface states in a non-Abelian charged nodal line photonic crystal Nanophotonics (IF 7.5) Pub Date : 2024-02-23 Haedong Park, Alexander Jones, Minkyung Kim, Sang Soon Oh
Topological charges of nodal lines in a multigap system are represented by non-Abelian numbers, and the Euler class, a topological invariant, can be used to explain their topological phase transitions, such as pair-annihilation of nodal lines. Up until now, no discussion of phase transitions of nodal lines in photonic crystals using the Euler class has been reported, despite the fact that the Euler
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Dirac exciton–polariton condensates in photonic crystal gratings Nanophotonics (IF 7.5) Pub Date : 2024-02-22 Helgi Sigurðsson, Hai Chau Nguyen, Hai Son Nguyen
Bound states in the continuum have recently been utilized in photonic crystal gratings to achieve strong coupling and ultralow threshold condensation of exciton–polariton quasiparticles with atypical Dirac-like features in their dispersion relation. Here, we develop the single- and many-body theory of these new effective relativistic polaritonic modes and describe their mean-field condensation dynamics
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The perfect waveguide coupler with universal impedance matching and transformation optics Nanophotonics (IF 7.5) Pub Date : 2024-02-22 Myeongjin Kim, Q-Han Park
Efficient energy transfer is crucial in electromagnetic communication. Therefore, producing a waveguide coupler that achieves broadband, nonreflective transmission is a challenging task. With the advancement of silicon-based integrated photonic circuits, fiber-to-chip coupling has become increasingly important. Although various couplers have been developed for fiber-to-chip coupling, they often have
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Independent and dynamic manipulation of surface waves radiation for quadruplex polarization channels enabled by programmable coding metasurface Nanophotonics (IF 7.5) Pub Date : 2024-02-22 Zhenxu Wang, Tonghao Liu, Jian-Gang Liang, Jiafu Wang, Yueyu Meng, Xinmin Fu, Hongya Chen, Ruichao Zhu, Zuntian Chu, Yina Cui, Huiting Sun, Shaojie Wang, Hua Ma, Shaobo Qu
Flexible manipulation of surface waves (SWs) radiation has been continuously intriguing enormous interests of researchers due to its promising application prospects, and metasurfaces exhibit unparalleled capability to efficiently control SWs radiation. However, existing schemes still suffer from the bottlenecks of single radiation channel and immutable radiation pattern, which are difficult to satisfy
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Metasurface for programmable quantum algorithms with classical and quantum light Nanophotonics (IF 7.5) Pub Date : 2024-02-21 Randy Stefan Tanuwijaya, Hong Liang, Jiawei Xi, Wai Chun Wong, Tsz Kit Yung, Wing Yim Tam, Jensen Li
Metasurfaces have recently opened up applications in the quantum regime, including quantum tomography and the generation of quantum entangled states. With their capability to store a vast amount of information by utilizing the various geometric degrees of freedom of nanostructures, metasurfaces are expected to be useful for processing quantum information. Here, we propose and experimentally demonstrate
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Thermally tunable binary-phase VO2 metasurfaces for switchable holography and digital encryption Nanophotonics (IF 7.5) Pub Date : 2024-02-21 Yuan Liao, Yulong Fan, Dangyuan Lei
Metasurface holography has aroused immense interest in producing holographic images with high quality, higher-order diffraction-free, and large viewing angles by using a planar artificial sheet consisting of subwavelength nanostructures. Despite remarkable progress, dynamically tunable metasurface holography in the visible band has rarely been reported due to limited available tuning methods. In this
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Temporally deuterogenic plasmonic vortices Nanophotonics (IF 7.5) Pub Date : 2024-02-21 Xinyao Yuan, Quan Xu, Yuanhao Lang, Zhibo Yao, Xiaohan Jiang, Yanfeng Li, Xueqian Zhang, Jiaguang Han, Weili Zhang
Over the past decade, orbital angular momentum has garnered considerable interest in the field of plasmonics owing to the emergence of surface-confined vortices, known as plasmonic vortices. Significant progress has been made in the generation and manipulation of plasmonic vortices, which broadly unveil the natures of plasmonic spin–orbit coupling and provide accessible means for light–matter interactions
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Coherent transient exciton transport in disordered polaritonic wires Nanophotonics (IF 7.5) Pub Date : 2024-02-21 Gustavo J. R. Aroeira, Kyle T. Kairys, Raphael F. Ribeiro
Excitation energy transport can be significantly enhanced by strong light–matter interactions. In the present work, we explore intriguing features of coherent transient exciton wave packet dynamics on a lossless disordered polaritonic wire. Our main results can be understood in terms of the effective exciton group velocity, a new quantity we obtain from the polariton dispersion. Under weak and moderate
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Topological hyperbolic metamaterials Nanophotonics (IF 7.5) Pub Date : 2024-02-20 Zhitong Li, Qing Gu
Hyperbolic metamaterial (HMM) is a unique type of anisotropic material that can exhibit metal and dielectric properties at the same time. This unique characteristic results in it having unbounded isofrequency surface contours, leading to exotic phenomena such as spontaneous emission enhancement and applications such as super-resolution imaging. However, at optical frequencies, HMM must be artificially
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Towards large-scale programmable silicon photonic chip for signal processing Nanophotonics (IF 7.5) Pub Date : 2024-02-17 Yiwei Xie, Jiachen Wu, Shihan Hong, Cong Wang, Shujun Liu, Huan Li, Xinyan Ju, Xiyuan Ke, Dajian Liu, Daoxin Dai
Optical signal processing has been playing a crucial part as powerful engine for various information systems in the practical applications. In particular, achieving large-scale programmable chips for signal processing are highly desirable for high flexibility, low cost and powerful processing. Silicon photonics, which has been developed successfully in the past decade, provides a promising option due