-
Detecting single nanoparticles using fiber-tip nanophotonics Optica (IF 10.4) Pub Date : 2024-04-16 Arthur L. Hendriks, Daan Rabelink, Mathias Dolci, Paco Dreverman, Mildred S. Cano-Velázquez, Luca Picelli, René P. J. van Veldhoven, Peter Zijlstra, Ewold Verhagen, and Andrea Fiore
Sensing nano-objects, from nanoparticles to molecules, has become a crucial need in environmental monitoring, medical diagnostics, and drug development. Detection of single particles and molecules is highly desirable, as it provides specific information on size, dynamics, and interactions. Current nanophotonic implementations rely on complex optical readout schemes, limiting their application in the
-
Experimental post-selection loophole-free time-bin and energy-time nonlocality with integrated photonics Optica (IF 10.4) Pub Date : 2024-04-12 Francesco B. L. Santagiustina, Costantino Agnesi, Alvaro Alarcón, Adán Cabello, Guilherme B. Xavier, Paolo Villoresi, and Giuseppe Vallone
Time-bin (TB) and energy-time (ET) entanglements are crucial resources for long-distance quantum information processing. However, their standard implementations suffer from the so-called post-selection loophole that allows for classical simulation and thus prevents quantum advantage. The post-selection loophole has been addressed in proof-of-principle experiments. An open problem though is to close
-
Ultralow noise microwave synthesis via difference frequency division of a Brillouin resonator Optica (IF 10.4) Pub Date : 2024-04-08 William Loh, Dodd Gray, Reed Irion, Owen May, Connor Belanger, Jason Plant, Paul W. Juodawlkis, and Siva Yegnanarayanan
Low phase noise microwave oscillators are at the center of a multitude of applications that span the gamut of photonics and electronics. Within this space, optically derived approaches to microwave frequency synthesis are particularly compelling owing to their unique combination of ultrawideband frequency access and the potential for resiliency to temperature and environmental perturbation via common-mode
-
Exceptional refrigeration of motions beyond their mass and temperature limitations Optica (IF 10.4) Pub Date : 2024-04-08 Deng-Gao Lai, C.-H. Wang, B.-P. Hou, Adam Miranowicz, and Franco Nori
Coaxing vibrations in the regimes of both large mass and high temperature into their motional quantum ground states is extremely challenging, because it requires an ultra-high optical power, which introduces extraneous excessive heating and intricate instabilities. Here we propose how to overcome these obstacles and cool vibrational networks by simply harnessing the power of an exceptional point (EP)
-
Transport-of-intensity model for single-mask x-ray differential phase contrast imaging Optica (IF 10.4) Pub Date : 2024-04-05 Jingcheng Yuan and Mini Das
X-ray phase contrast imaging holds great promise for improving the visibility of light-element materials such as soft tissues and tumors. The single-mask differential phase contrast imaging method stands out as a simple and effective approach to yield differential phase contrast. In this work, we introduce a model for a single-mask phase imaging system based on the transport-of-intensity equation.
-
Broadband near-ultraviolet dual comb spectroscopy Optica (IF 10.4) Pub Date : 2024-04-02 Lukas Fürst, Adrian Kirchner, Alexander Eber, Florian Siegrist, Robert di Vora, and Birgitta Bernhardt
The highly energetic photons of ultraviolet light drive electronic and rovibronic transitions in all molecular species. This radiation is thus a prime tool for strongly selective spectroscopic fingerprinting and real-time environmental monitoring if broad spectral coverage, short acquisition times, and high spectral resolution are achieved–requirements that are in mutual competition in traditional
-
Stimulated emission does not radiate in a pure dipole pattern Optica (IF 10.4) Pub Date : 2024-03-29 Andrew E. S. Barentine and W. E. Moerner
Stimulated emission (StE) remains relatively unused as an image-forming signal despite having potential advantages over fluorescence in speed, coherence, and ultimately resolution. Several ideas for the radiation pattern and directionality of StE remain prevalent, namely, whether a single molecule would radiate StE itself in a pure dipole pattern, or whether its emission direction depends on the driving
-
Dual-comb spectroscopy in the deep ultraviolet Optica (IF 10.4) Pub Date : 2024-03-28 John J. McCauley, Mark C. Phillips, Reagan R. D. Weeks, Yu Zhang, Sivanandan S. Harilal, and R. Jason Jones
This Letter reports dual-frequency-comb spectroscopy in the deep ultraviolet used to characterize transient laser-produced plasmas. Dual-comb spectroscopy at these wavelengths enables access to a large number of strong electronic transitions in neutral and ionized atoms and molecules. This broadband dual-frequency-comb system at 265 nm measures multiple transitions in neutral and singly ionized iron
-
High-efficiency high-numerical-aperture metalens designed by maximizing the efficiency limit Optica (IF 10.4) Pub Date : 2024-03-28 Shiyu Li, Ho-Chun Lin, and Chia Wei Hsu
Theoretical bounds are commonly used to assess the limitations of photonic design. Here we introduce a more active way to use theoretical bounds, integrating them into part of the design process and identifying optimal system parameters that maximize the efficiency limit itself. As an example, we consider wide-field-of-view high-numerical-aperture metalenses, which can be used for high-resolution imaging
-
Ultra-intense femtosecond laser interactions with aligned nanostructures Optica (IF 10.4) Pub Date : 2024-03-20 Jorge J. Rocca, Maria G. Capeluto, Reed C. Hollinger, Shoujun Wang, Yong Wang, G. Ravindra Kumar, Amit D. Lad, Alexander Pukhov, and Vyacheslav N. Shlyaptsev
The interaction of ultrafast laser pulses of relativistic intensity with high aspect ratio nanostructures can efficiently and volumetrically heat matter to an ultra-high-energy-density regime encountered in the center of stars and within the core of fusion capsules compressed by the world’s largest lasers. It also generates gigantic quasi-static electromagnetic fields that accelerate particles to very
-
High-resolution ptychographic imaging at a seeded free-electron laser source using OAM beams Optica (IF 10.4) Pub Date : 2024-03-18 Matteo Pancaldi, Francesco Guzzi, Charles S. Bevis, Michele Manfredda, Jonathan Barolak, Stefano Bonetti, Iuliia Bykova, Dario De Angelis, Giovanni De Ninno, Mauro Fanciulli, Luka Novinec, Emanuele Pedersoli, Arun Ravindran, Benedikt Rösner, Christian David, Thierry Ruchon, Alberto Simoncig, Marco Zangrando, Daniel E. Adams, Paolo Vavassori, Maurizio Sacchi, George Kourousias, Giulia F. Mancini, and
Electromagnetic waves possessing orbital angular momentum (OAM) are powerful tools for applications in optical communications, quantum technologies, and optical tweezers. Recently, they have attracted growing interest since they can be harnessed to detect peculiar helical dichroic effects in chiral molecular media and in magnetic nanostructures. In this work, we perform single-shot per position ptychography
-
Sculpting harmonic comb states in terahertz quantum cascade lasers by controlled engineering Optica (IF 10.4) Pub Date : 2024-03-18 Elisa Riccardi, M. Alejandro Justo Guerrero, Valentino Pistore, Lukas Seitner, Christian Jirauschek, Lianhe Li, A. Giles Davies, Edmund H. Linfield, and Miriam S. Vitiello
Optical frequency combs (OFCs), which establish a rigid phase-coherent link between the microwave and optical domains of the electromagnetic spectrum, are emerging as key high-precision tools for the development of quantum technology platforms. These include potential applications for communication, computation, information, sensing, and metrology and can extend from the near-infrared with micro-resonator
-
Scalable machine learning-assisted clear-box characterization for optimally controlled photonic circuits Optica (IF 10.4) Pub Date : 2024-03-19 Andreas Fyrillas, Olivier Faure, Nicolas Maring, Jean Senellart, and Nadia Belabas
Photonic integrated circuits offer a compact and stable platform for generating, manipulating, and detecting light. They are instrumental for classical and quantum applications. Imperfections stemming from fabrication constraints, tolerances, and operation wavelength impose limitations on the accuracy and thus utility of current photonic integrated devices. Mitigating these imperfections typically
-
Self-injection-locked optical parametric oscillator based on microcombs Optica (IF 10.4) Pub Date : 2024-03-18 Fuchuan Lei, Yi Sun, Óskar B. Helgason, Zhichao Ye, Yan Gao, Magnus Karlsson, Peter A. Andrekson, and Victor Torres-Company
Narrow-linewidth yet tunable laser oscillators are one of the most important tools for precision metrology, optical atomic clocks, sensing, and quantum computing. Commonly used tunable coherent oscillators are based on stimulated emission or stimulated Brillouin scattering; as a result, the operating wavelength band is limited by the gain media. Based on nonlinear optical gain, optical parametric oscillators
-
Miniaturized computational spectrometer based on two-photon absorption Optica (IF 10.4) Pub Date : 2024-03-15 Yaotian Zhao, Xuhan Guo, Jinlong Xiang, Zhenyu Zhao, Yujia Zhang, Xi Xiao, Jia Liu, Daigao Chen, and Yikai Su
On-chip spectrometers hold significant promise in the development of laboratory-on-a-chip applications. However, the spectrometers usually require extra on-chip or off-chip photodetectors (PDs) to sense optical signals, resulting in increased footprints and costs. In this paper, we address this issue by proposing a fully on-chip spectrometer based on two-photon absorption (TPA) in a simple micro-ring
-
Low-power, agile electro-optic frequency comb spectrometer for integrated sensors Optica (IF 10.4) Pub Date : 2024-03-11 Kyunghun Han, David A. Long, Sean M. Bresler, Junyeob Song, Yiliang Bao, Benjamin J. Reschovsky, Kartik Srinivasan, Jason J. Gorman, Vladimir A. Aksyuk, and Thomas W. LeBrun
Sensing platforms based upon photonic integrated circuits have shown considerable promise; however, they require corresponding advancements in integrated optical readout technologies. Here, we present an on-chip spectrometer that leverages an integrated thin-film lithium niobate modulator to produce a frequency-agile electro-optic frequency comb for interrogating chip-scale temperature and acceleration
-
Overcoming the diffraction limit by exploiting unmeasured scattering media Optica (IF 10.4) Pub Date : 2024-03-08 Shuai Sun, Zhen-Wu Nie, Long-Kun Du, Chen Chang, and Wei-Tao Liu
Scattering is not necessarily an obstacle to imaging. It can help enhance imaging performance beyond the reach of a lens system. However, current scattering-enhanced imaging systems require prior knowledge of the transmission matrix. There are also some techniques that do not require such prior knowledge to see through strongly scattering media, but the results are still limited by the optics used
-
Ultra-broadband magneto-optical isolators and circulators on a silicon nitride photonics platform Optica (IF 10.4) Pub Date : 2024-03-08 Wei Yan, Zixuan Wei, Yucong Yang, Di Wu, Zijian Zhang, Xiaoyi Song, Jun Qin, and Lei Bi
Broadband optical isolators and circulators are highly desirable for wavelength-division multiplexing, light detection, and ranging systems. However, the silicon-integrated optical isolators and circulators reported so far have a limited isolation bandwidth of only several nanometers, due to waveguide and material dispersion. In this paper, we report the development of broadband magneto-optical isolators
-
In situ tuning of optomechanical crystals with nano-oxidation Optica (IF 10.4) Pub Date : 2024-03-08 Utku Hatipoglu, Sameer Sonar, David P. Lake, Srujan Meesala, and Oskar Painter
Optomechanical crystals are a promising device platform for quantum transduction and sensing. Precise targeting of the optical and acoustic resonance frequencies of these devices is crucial for future advances on these fronts. However, fabrication disorder in these wavelength-scale nanoscale devices typically leads to inhomogeneous resonance frequencies. Here we achieve in situ, selective frequency
-
Quartz as an accurate high-field low-cost THz helicity detector Optica (IF 10.4) Pub Date : 2024-03-08 Maximilian Frenzel, Joanna M. Urban, Leona Nest, Tobias Kampfrath, Michael S. Spencer, and Sebastian F. Maehrlein
Emerging concepts employing angular momentum of THz light for ultrafast material control rely on the measurement of undistorted intense THz fields and on the precise knowledge about sophisticated THz helicity states. Here, we establish z-cut \alpha -quartz as a precise electro-optic THz detector for full amplitude, phase, and polarization measurement of highly intense THz fields, all at a fraction
-
Phase noise matching in resonant metasurfaces for intrinsic sensing stability Optica (IF 10.4) Pub Date : 2024-03-08 Isabel Barth, Donato Conteduca, Pin Dong, Jasmine Wragg, Pankaj K. Sahoo, Guilherme S. Arruda, Emiliano R. Martins, and Thomas F. Krauss
Interferometry offers a precise means of interrogating resonances in dielectric and plasmonic metasurfaces, surpassing spectrometer-imposed resolution limits. However, interferometry implementations often face complexity or instability issues due to heightened sensitivity. Here, we address the necessity for noise compensation and tolerance by harnessing the inherent capabilities of photonic resonances
-
Optical shift spectroscopy in two-dimensional materials Optica (IF 10.4) Pub Date : 2024-03-08 Mingjie Zha, Xiaofeng Li, Enze Xu, Xiao-Qing Yan, Xinxing Zhou, Hui Jing, Le-Man Kuang, Jian-Guo Tian, and Zhi-Bo Liu
Optical beam shifts, such as the Goos–Hänchen (GH) shift and the Imbert–Fedorov (IF) shift, are fundamental optical phenomena. However, because these shifts are so minute, direct measurement is challenging, and obtaining an optical shift spectrum is even more difficult. Here, we successfully obtained GH and IF shift spectra using a beam displacement amplification technique. The optical shift spectrum
-
Large reconfigurable quantum circuits with SPAD arrays and multimode fibers Optica (IF 10.4) Pub Date : 2024-02-28 Adrian Makowski, Michał Dąbrowski, Ivan Michel Antolovic, Claudio Bruschini, Hugo Defienne, Edoardo Charbon, Radek Lapkiewicz, and Sylvain Gigan
Reprogrammable integrated optics provides a natural platform for tunable quantum photonic circuits, but faces challenges when high dimensions and high connectivity are involved. Here, we implement high-dimensional linear transformations on spatial modes of photons using wavefront shaping together with mode mixing in a multimode fiber, and measure photon correlations using a time-tagging single-photon
-
Demonstration of high-power photonic-crystal surface-emitting lasers with 1-kHz-class intrinsic linewidths Optica (IF 10.4) Pub Date : 2024-02-26 Ryohei Morita, Takuya Inoue, Masahiro Yoshida, Kentaro Enoki, Menaka De Zoysa, Kenji Ishizaki, and Susumu Noda
Photonic-crystal surface-emitting lasers (PCSELs) are capable of single-mode, high-power lasing over a large resonator area owing to two-dimensional resonance at a singularity point of the photonic band structure. Since the number of photons in the lasing mode in PCSELs are much larger than those in conventional semiconductor lasers, PCSELs are in principle suitable for coherent operation with a narrow
-
MEMS-integrated metasurfaces for dynamic linear polarizers Optica (IF 10.4) Pub Date : 2024-02-23 Yadong Deng, Chao Meng, Paul C. V. Thrane, Sören im Sande, Sergey I. Bozhevolnyi, and Fei Ding
Optical metasurfaces (OMSs), planar arrays of meticulously designed meta-atoms, are renowned for remarkable capabilities in manipulating the polarization state of light at subwavelength scales. Nevertheless, most OMS-empowered polarization optics remain static, featuring well-defined optical responses determined by their configurations set during fabrication. Here, we demonstrate a MEMS-OMS-based dynamic
-
Single-peak and narrow-band mid-infrared thermal emitters driven by mirror-coupled plasmonic quasi-BIC metasurfaces Optica (IF 10.4) Pub Date : 2024-02-22 Sen Yang, Mingze He, Chuchuan Hong, Josh Nordlander, Jon-Paul Maria, Joshua D. Caldwell, and Justus C. Ndukaife
Wavelength-selective thermal emitters (WS-EMs) hold considerable appeal due to the scarcity of cost-effective, narrow-band sources in the mid-to-long-wave infrared spectrum. WS-EMs achieved via dielectric materials typically exhibit thermal emission peaks with high quality factors ({Q} factors), but their optical responses are prone to temperature fluctuations. Metallic EMs, on the other hand, show
-
Efficient parametric down-conversion by gain-trapped solitons Optica (IF 10.4) Pub Date : 2024-02-22 Marin Hamrouni, Marc Jankowski, Alexander Y. Hwang, Nayara Jornod, Jatadhari Mishra, Hubert S. Stokowski, Timothy P. McKenna, Carsten Langrock, Thomas Südmeyer, Amir Safavi-Naeini, and Martin M. Fejer
Optical parametric amplification is one of the most flexible approaches for generating coherent light at long wavelengths, but typical implementations require prohibitively large pump pulse energies to realize useful amounts of gain. In this work, we experimentally demonstrate an approach to optical parametric amplification in which an interplay between parametric gain and symmetric temporal walk-off
-
Multiplexed wavefront sensing with a thin diffuser Optica (IF 10.4) Pub Date : 2024-02-16 Tengfei Wu, Marc Guillon, Gilles Tessier, and Pascal Berto
In astronomy or biological imaging, refractive index inhomogeneities of, e.g., atmosphere or tissues, induce optical aberrations that degrade the desired information hidden behind the medium. A standard approach consists of measuring these aberrations with a wavefront sensor (e.g., Shack–Hartmann) located in the pupil plane, and compensating for them either digitally or by adaptive optics with a wavefront
-
Ground observations of a space laser for the assessment of its in-orbit performance Optica (IF 10.4) Pub Date : 2024-02-13 The Pierre Auger Collaboration, Oliver Lux, Isabell Krisch, Oliver Reitebuch, Dorit Huber, Denny Wernham, and Tommaso Parrinello
The wind mission Aeolus of the European Space Agency was a groundbreaking achievement for Earth observation. Between 2018 and 2023, the space-borne lidar instrument ALADIN onboard the Aeolus satellite measured atmospheric wind profiles with global coverage, which contributed to improving the accuracy of numerical weather prediction. The precision of the wind observations, however, declined over the
-
Ground observations of a space laser for the assessment of its in-orbit performance Optica (IF 10.4) Pub Date : 2024-02-15 The Pierre Auger Collaboration, Oliver Lux, Isabell Krisch, Oliver Reitebuch, Dorit Huber, Denny Wernham, and Tommaso Parrinello
The wind mission Aeolus of the European Space Agency was a groundbreaking achievement for Earth observation. Between 2018 and 2023, the space-borne lidar instrument ALADIN onboard the Aeolus satellite measured atmospheric wind profiles with global coverage, which contributed to improving the accuracy of numerical weather prediction. The precision of the wind observations, however, declined over the
-
Ultraviolet pulse compression via cross-phase modulation in a hollow-core fiber Optica (IF 10.4) Pub Date : 2024-02-13 Yujiao Jiang, John Pascal Messerschmidt, Fabian Scheiba, Igor Tyulnev, Lu Wang, Zhiyi Wei, and Giulio Maria Rossi
The generation of few-femtosecond pulses with high energy and tunable spectrum in the ultraviolet region is an ongoing challenge in ultrafast optics. Harnessing the cross-phase modulation between an intense near-infrared pulse and its third-harmonic, co-propagating in a gas-filled hollow-core fiber, we demonstrate spectral tuning, broadening, and temporal compression in the ultraviolet range. Ultraviolet
-
Transverse mode control in quantum enhanced interferometers: a review and recommendations for a new generation Optica (IF 10.4) Pub Date : 2024-02-13 Aaron W. Goodwin-Jones, Ricardo Cabrita, Mikhail Korobko, Martin Van Beuzekom, Daniel D. Brown, Viviana Fafone, Joris Van Heijningen, Alessio Rocchi, Mitchell G. Schiworski, and Matteo Tacca
Adaptive optics has made significant advancement over the past decade, becoming the essential technology in a wide variety of applications, particularly in the realm of quantum optics. One key area of impact is gravitational-wave detection, where quantum correlations are distributed over kilometer-long distances by beams with hundreds of kilowatts of optical power. Decades of development were required
-
How many supercells are required for unconventional light confinement in moiré photonic lattices? Optica (IF 10.4) Pub Date : 2024-02-08 Chirine Saadi, Hai Son Nguyen, Sébastien Cueff, Lydie Ferrier, Xavier Letartre, and Ségolène Callard
Moiré structures are receiving increasing attention in nanophotonics as they support intriguing optical phenomena. In the so-called “magic configuration,” one-dimensional moirés give rise to fully dispersionless energy bands known as “flatbands,” where the light is tightly localized within each supercell of the periodic moiré. The goal of this investigation is to determine to what extent the confinement
-
Spiral diopter: freeform lenses with enhanced multifocal behavior Optica (IF 10.4) Pub Date : 2024-02-08 Laurent Galinier, Philippe Renaud-Goud, Jean Brusau, Lucien Kergadallan, Jean Augereau, and Bertrand Simon
Lens design is of paramount importance in the evolving world of technology, where compactness and high optical performance are a necessity, ranging from smartphones and wearable devices to vehicles and virtual reality. Freeform design techniques allow us to transcend traditional limitations, but creating new optics remains a substantial challenge unless we consider unconventional physical phenomena
-
Optimum design of aspect ratio limited x-ray zone plates Optica (IF 10.4) Pub Date : 2024-02-08 Cameron M. Kewish, Sergey Gorelick, David M. Paganin, and Martin D. de Jonge
Fresnel zone plates are widely used for nanofocusing in x-ray microscopy. The focusing performance is described in terms of the resolution, related to the width of the smallest outermost zones, and the efficiency, governed by the thickness of the zones and therefore the amount of phase shift imparted onto the x-ray beam. The ratio of zone thickness to width, or “aspect ratio,” is limited in all methods
-
Scaled local gate controller for optically addressed qubits Optica (IF 10.4) Pub Date : 2024-02-07 Bichen Zhang, Pai Peng, Aditya Paul, and Jeff D. Thompson
Scalable classical controllers are a key component of future fault-tolerant quantum computers. Neutral atom quantum computers leverage commercially available optoelectronic devices for generating large-scale tweezer arrays and performing parallel readout, but implementing massively parallel, locally addressed gate operations is an open challenge. In this work, we demonstrate an optical modulator system
-
Coherent x-ray magnetic imaging with 5 nm resolution Optica (IF 10.4) Pub Date : 2024-02-07 Riccardo Battistelli, Daniel Metternich, Michael Schneider, Lisa-Marie Kern, Kai Litzius, Josefin Fuchs, Christopher Klose, Kathinka Gerlinger, Kai Bagschik, Christian M. Günther, Dieter Engel, Claus Ropers, Stefan Eisebitt, Bastian Pfau, Felix Büttner, and Sergey Zayko
Soft x-ray microscopy plays an important role in modern spintronics. However, the achievable resolution of most x-ray magnetic imaging experiments limits access to fundamental and technologically relevant length scales in the sub-10 nm regime. Here, we demonstrate x-ray magnetic microscopy with 5 nm resolution by combining holography-assisted coherent diffractive imaging with heterodyne amplification
-
Supercharged two-dimensional tweezer array with more than 1000 atomic qubits Optica (IF 10.4) Pub Date : 2024-02-07 Lars Pause, Lukas Sturm, Marcel Mittenbühler, Stephan Amann, Tilman Preuschoff, Dominik Schäffner, Malte Schlosser, and Gerhard Birkl
We report on the realization of a large-scale quantum-processing architecture surpassing the tier of 1000 atomic qubits. By tiling multiple microlens-generated tweezer arrays, each operated by an independent laser source, we can eliminate laser-power limitations in the number of allocatable qubits. Already with two separate arrays, we implement combined 2D configurations of 3000 qubit sites with a
-
Acoustic-feedback wavefront-adapted photoacoustic microscopy Optica (IF 10.4) Pub Date : 2024-02-05 Yuecheng Shen, Jun Ma, Chengtian Hou, Jiayu Zhao, Yan Liu, Hsun-Chia Hsu, Terence T. W. Wong, Bai-Ou Guan, Shian Zhang, and Lihong V. Wang
Optical microscopy is indispensable to biomedical research and clinical investigations. As all molecules absorb light, optical-resolution photoacoustic microscopy (PAM) is an important tool to image molecules at high resolution without labeling. However, due to tissue-induced optical aberration, the imaging quality degrades with increasing imaging depth. To mitigate this effect, we develop an imaging
-
Hard x-ray grazing-incidence ptychography: large field-of-view nanostructure imaging with ultra-high surface sensitivity Optica (IF 10.4) Pub Date : 2024-02-01 P. S. Jørgensen, L. Besley, A. M. Slyamov, A. Diaz, M. Guizar-Sicairos, M. Odstrčil, M. Holler, C. Silvestre, B. Chang, C. Detlefs, and J. W. Andreasen
The morphology and distribution of nanoscale structures, such as catalytic active nanoparticles and quantum dots on surfaces, have a significant impact on their function. Thus, the capability of monitoring these properties during manufacturing and operation is crucial for the development of devices that rely on such materials. We demonstrate a technique that allows highly surface-sensitive imaging
-
Generation and applications of spectral-spatially correlated principal mode in multimode fibers Optica (IF 10.4) Pub Date : 2024-02-01 Han Gao, Haifeng Hu, and Qiwen Zhan
Light propagating through multimode fibers experiences multiple scattering, leading to complex speckle output patterns and significant dispersion. In this work, we propose a unique light state called the spectral-spatially correlated principal mode (S2 principal mode) in multimode fibers. This mode demonstrates an ability to simultaneously manipulate the spectral correlation and spatial distribution
-
Micro-opto-mechanical glass interferometer for megahertz modulation of optical signals Optica (IF 10.4) Pub Date : 2024-01-31 Roberto Memeo, Andrea Crespi, and Roberto Osellame
Waveguide-based interferometric circuits are widely employed in optical communications, sensing, and computing applications. In particular, glass-based devices are appealing due to the transparency and bio-compatibility of this substrate, or where low-loss interfacing with fiber networks is required. However, fast electro-optic phase modulation is hard to achieve in glass materials. Here, we demonstrate
-
Distinguishing under- and over-coupled resonances without prior knowledge Optica (IF 10.4) Pub Date : 2024-01-31 Chaohan Cui, Liang Zhang, Bo-Han Wu, Shuai Liu, Pao-Kang Chen, and Linran Fan
We show that it is unreliable to determine the coupling condition of optical resonances by analyzing the extinction ratio change with wavelengths. We propose and demonstrate the unambiguous discrimination between under- and over-coupled resonances using binary phase modulation in power transmission measurement.
-
Integrated-waveguide-based acousto-optic modulation with complete optical conversion Optica (IF 10.4) Pub Date : 2024-01-31 Liang Zhang, Chaohan Cui, Pao-Kang Chen, and Linran Fan
Acousto-optic modulation in piezoelectric materials offers the efficient method to bridge electrical and optical signals. It is widely used to control optical frequencies and intensities in modern optical systems including Q -switch lasers, ion traps, and optical tweezers. It is also critical for emerging applications such as quantum photonics and non-reciprocal optics. Acousto-optic devices have recently
-
Compact, efficient, and scalable nanobeam core for photonic matrix-vector multiplication Optica (IF 10.4) Pub Date : 2024-01-31 Jiahui Zhang, Bo Wu, Junwei Cheng, Jianji Dong, and Xinliang Zhang
Optical neural networks have emerged as a promising avenue for implementing artificial intelligence applications, with matrix computations being a crucial component. However, the existing implementations based on microring resonators (MRRs) face bottlenecks in integration, power efficiency, and scalability, hindering the practical applications of wavelength division multiplexing (WDM)-based matrix-vector
-
High-harmonic generation with a twist: all-optical characterization of magic-angle twisted bilayer graphene Optica (IF 10.4) Pub Date : 2024-01-30 Eduardo B. Molinero, Anushree Datta, M. J. Calderón, E. Bascones, and Rui E. F. Silva
If we stack up two layers of graphene while changing their respective orientation by some twisting angle, we end up with a strikingly different system when compared to single-layer graphene. For a very specific value of this twist angle, known as magic angle, twisted bilayer graphene displays a unique phase diagram that cannot be found in other systems. Recently, high-harmonic generation spectroscopy
-
Ultra-sensitive separation estimation of optical sources Optica (IF 10.4) Pub Date : 2024-01-26 Clémentine Rouvière, David Barral, Antonin Grateau, Ilya Karuseichyk, Giacomo Sorelli, Mattia Walschaers, and Nicolas Treps
Historically, the resolution of optical imaging systems was dictated by diffraction, and the Rayleigh criterion was long considered an unsurpassable limit. In superresolution microscopy, this limit is overcome by manipulating the emission properties of the object. However, in passive imaging, when sources are uncontrolled, reaching sub-Rayleigh resolution remains a challenge. Here, we implement a
-
Label-free multimodal polarization-sensitive optical microscope for multiparametric quantitative characterization of collagen Optica (IF 10.4) Pub Date : 2024-01-25 Lingxiao Yang, Rishyashring R. Iyer, Janet E. Sorrells, Eric J. Chaney, and Stephen A. Boppart
Collagen is an essential component of biological tissues with a variety of subtypes. To be able to capture these subtypes, fully exploit the polarization-sensitive light-collagen interactions, and provide comprehensive information of collagen, we integrated polarization-sensitive second-harmonic generation (PSHG) microscopy, polarization-sensitive optical coherence microscopy (PSOCM), and two-photon
-
Deep learning enhanced super-resolution x-ray fluorescence microscopy by a dual-branch network Optica (IF 10.4) Pub Date : 2024-01-25 Xiaoyin Zheng, Varun R. Kankanallu, Chang-An Lo, Ajith Pattammattel, Yong Chu, Yu-Chen Karen Chen-Wiegart, and Xiaojing Huang
X-ray fluorescence (XRF) microscopy is a powerful technique for quantifying the distribution of elements in complex materials, which makes it a crucial imaging technique across a wide range of disciplines in physical and biological sciences, including chemistry, materials science, microbiology, and geosciences. However, as a scanning microscopy technique, the spatial resolution of XRF imaging is inherently
-
Far-field speckle correlations as a function of object position for microscopically distinguishing objects hidden in a randomly scattering medium Optica (IF 10.4) Pub Date : 2024-01-24 Ryan L. Hastings, David W. Alexander, and Kevin J. Webb
Super-resolution optical sensing is of critical importance in science and technology and has required prior information about an imaging system or obtrusive near-field probing. Additionally, coherent imaging and sensing in heavily scattering media such as biological tissue has been challenging, and practical approaches have either been restricted to measuring the field transmission of a single point
-
Non-diffracting polarization features around far-field zeros of electromagnetic radiation Optica (IF 10.4) Pub Date : 2024-01-18 Alex J. Vernon, Andrew Kille, Francisco J. Rodríguez-Fortuño, and Andrei Afanasev
Light from any physical source diffracts over space, as spherical wavefronts grow and energy density is spread out. Diffractive effects pose fundamental limits to light-based technologies, including communications, spectroscopy, and metrology. Polarization becomes paraxial in the far-field limit, and, by ignoring longitudinal field components, the rich physics of non-paraxial fields that exist in near-fields
-
All-optically untangling light propagation through multimode fibers Optica (IF 10.4) Pub Date : 2024-01-17 Hlib Kupianskyi, Simon A. R. Horsley, and David B. Phillips
When light propagates through a complex medium, such as a multimode optical fiber (MMF), the spatial information it carries is scrambled. In this work we experimentally demonstrate an all-optical strategy to unscramble this light again. We first create a digital model capturing the way light has been scattered, and then use this model to inverse-design and build a complementary optical system–which
-
Second-harmonic generation microscopy with synthetic aperture and computational adaptive optics Optica (IF 10.4) Pub Date : 2024-01-19 Jungho Moon, Sungsam Kang, Ye-Chan Cho, Jin Hee Hong, Dong-Jin Shin, Su-Hyun Gong, Seok-Chan Yoon, and Wonshik Choi
Second-harmonic generation (SHG) microscopy is a powerful label-free imaging tool widely used to visualize collagen and muscle in biological tissues. However, traditional laser-scanning SHG microscopy requiring voxel scanning is time-intensive. Wide-field SHG microscopy was designed to bypass this restriction, but its application to deep tissue imaging is limited due to vulnerability to scattering
-
Photonic engineering of InP towards homoepitaxial short-wavelength infrared VCSELs Optica (IF 10.4) Pub Date : 2024-01-18 Bingjun Li, Chenziyi Mi, Jin-Ho Kang, Hao Li, Rami T. Elafandy, Wei-Chih Lai, Jinn-Kong Sheu, and Jung Han
Many emerging opportunities, such as three-dimensional (3D) sensing, biophotonics, and optical data links, call for vertical cavity surface-emitting lasers (VCSELs) that operate in the short-wavelength infrared (SWIR) range. In this paper, we report the use of InP distributed Bragg reflector (DBR) mirrors to overcome an impasse in wafer-level mass production of SWIR VCSELs. The DBRs were based on homoepitaxial
-
Enhanced opposite Imbert–Fedorov shifts of vortex beams for precise sensing of temperature and thickness Optica (IF 10.4) Pub Date : 2024-01-12 Guiyuan Zhu, Binjie Gao, Linhua Ye, Junxiang Zhang, and Li-Gang Wang
The Imbert–Fedorov (IF) shift, which refers to a tiny transverse splitting induced by spin–orbit interaction at a reflection/refraction interface, is sensitive to the refractive index of a medium and momentum state of incident light. Most studies have focused on the shift for an incident light beam with a spin angular momentum (SAM), i.e., circular polarization. We demonstrate experimentally that the
-
Ultra-broadband quantum infrared spectroscopy Optica (IF 10.4) Pub Date : 2024-01-12 Toshiyuki Tashima, Yu Mukai, Masaya Arahata, Norihide Oda, Mamoru Hisamitsu, Katsuhiko Tokuda, Ryo Okamoto, and Shigeki Takeuchi
Spectroscopy in the mid-infrared region is an indispensable tool for identifying molecular types in various fields, including physics, chemistry, and medical sciences. However, conventional infrared light sources, detectors, and noise from blackbody radiation have been the obstacles to miniaturization and higher sensitivity of infrared spectrometers. Quantum infrared spectroscopy, which uses visible
-
Spatiotemporal electric-field characterization of synthesized light transients Optica (IF 10.4) Pub Date : 2024-01-12 Mikhail Mamaikin, Enrico Ridente, Ferenc Krausz, and Nicholas Karpowicz
The versatile manipulation of electron motion on the atomic scale calls for the shaping of the electric field evolution of light within a single cycle. The super-octave bandwidth required for this task dramatically increases the probability of formation of spatio-temporal distortions. As a result, the accuracy of physical observables can be extremely compromised by spatial averaging unless the complete
-
Spinning metasurface stack for spectro-polarimetric thermal imaging Optica (IF 10.4) Pub Date : 2024-01-11 Xueji Wang, Ziyi Yang, Fanglin Bao, Tyler Sentz, and Zubin Jacob
Spectro-polarimetric imaging in the long-wave infrared (LWIR) region plays a crucial role in applications from night vision and machine perception to trace gas sensing and thermography. However, the current generation of spectro-polarimetric LWIR imagers suffers from limitations in size, spectral resolution, and field of view (FOV). While meta-optics-based strategies for spectro-polarimetric imaging
-
Synthetic FM triplet for AM-free precision laser stabilization and spectroscopy Optica (IF 10.4) Pub Date : 2024-01-09 Dhruv Kedar, Zhibin Yao, Ivan Ryger, John L. Hall, and Jun Ye
The Pound–Drever–Hall (PDH) cavity-locking scheme has found prevalent uses in precision optical interferometry and laser frequency stabilization. A form of frequency modulation spectroscopy, PDH enjoys superior signal-to-noise recovery, large acquisition dynamic range, wide servo bandwidth, and robust rejection of spurious effects. However, residual amplitude modulation at the signal frequency, while
-
All-optical complex-valued convolution based on four-wave mixing Optica (IF 10.4) Pub Date : 2024-01-09 Wentao Gu, Xiaoyan Gao, Wenchan Dong, Yilun Wang, Hailong Zhou, Jing Xu, and Xinliang Zhang
Optical complex-valued convolution can extract the feature of complex-valued data by processing both amplitude and phase information, enabling a wide range of future applications in artificial intelligence and high-speed optical computation. However, because optical signals at different wavelengths cannot interfere, optical systems based on wavelength multiplexing usually can only realize real-valued