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  • Near-octave lithium niobate soliton microcomb
    Optica (IF 9.778) Pub Date : 2020-09-28
    Zheng Gong, Xianwen Liu, Yuntao Xu, and Hong X. Tang

    Thin film lithium niobate (LN) is bringing renewed potential to the realm of integrated photonics. Its strong quadratic and cubic nonlinearities as well as wide transparency window are ideal for realizing on-chip self-referenced soliton microcombs. However, broadband Kerr cavity soliton generation in LN thin films remains challenging due to limited dispersion control and competition from strong stimulated

    更新日期:2020-09-25
  • Subwavelength generation of nondiffracting structured light beams
    Optica (IF 9.778) Pub Date : 2020-09-28
    Yanwen Hu, Shenhe Fu, Hao Yin, Zhen Li, Zhaohui Li, and Zhenqiang Chen

    Nondiffracting light beams have been attracting considerable attention for their various applications in both classical and quantum optics. Whereas substantial investigations on generation of the nondiffracting beams were made, their lateral dimension is much larger than optical wavelength. Here we present both theoretically and experimentally a study of the generation of nondiffracting light beams

    更新日期:2020-09-25
  • Picometer wavefront sensing using the phase-contrast technique
    Optica (IF 9.778) Pub Date : 2020-09-28
    John Steeves, J. Kent Wallace, Christian Kettenbeil, and Jeffrey Jewell

    Precision wavefront sensing and interferometry are essential in many fields of industry and fundamental research. Characterization of semiconductor devices, optics in lithography systems, and biologic features of living cells all require measurement resolution at the nanometer level. The field of high-contrast imaging in space-based astronomy has pushed wavefront sensing requirements to a new regime

    更新日期:2020-09-25
  • Cavity quantum electrodynamics with color centers in diamond
    Optica (IF 9.778) Pub Date : 2020-09-21
    Erika Janitz, Mihir K. Bhaskar, and Lilian Childress

    Coherent interfaces between optical photons and long-lived matter qubits form a key resource for a broad range of quantum technologies. Cavity quantum electrodynamics (cQED) offers a route to achieve such an interface by enhancing interactions between cavity-confined photons and individual emitters. Over the last two decades, a promising new class of emitters based on defect centers in diamond has

    更新日期:2020-09-22
  • Ultrafast spinning twisted ribbons of confined electric fields
    Optica (IF 9.778) Pub Date : 2020-09-21
    Thomas Bauer, Svetlana N. Khonina, Ilya Golub, Gerd Leuchs, and Peter Banzer

    Topological properties of light attract tremendous attention in the optics communities and beyond. For instance, light beams gain robustness against certain deformations when carrying topological features, enabling intriguing applications. We report on the observation of a topological structure contained in an optical beam, i.e., a twisted ribbon formed by the electric field vector per se, in stark

    更新日期:2020-09-22
  • High-speed 3D sensing via hybrid-mode imaging and guided upsampling
    Optica (IF 9.778) Pub Date : 2020-09-21
    Istvan Gyongy, Sam W. Hutchings, Abderrahim Halimi, Max Tyler, Susan Chan, Feng Zhu, Stephen McLaughlin, Robert K. Henderson, and Jonathan Leach

    Imaging systems with temporal resolution play a vital role in a diverse range of scientific, industrial, and consumer applications, e.g., fluorescent lifetime imaging in microscopy and time-of-flight (ToF) depth sensing in autonomous vehicles. In recent years, single-photon avalanche diode (SPAD) arrays with picosecond timing capabilities have emerged as a key technology driving these systems forward

    更新日期:2020-09-22
  • Photorealistic full-color nanopainting enabled by a low-loss metasurface
    Optica (IF 9.778) Pub Date : 2020-09-04
    Pengcheng Huo, Maowen Song, Wenqi Zhu, Cheng Zhang, Lu Chen, Henri J. Lezec, Yanqing Lu, Amit Agrawal, and Ting Xu

    We realize a dielectric metasurface that enables full-color generation and ultrasmooth brightness variation. The reproduced artwork “girl with a pearl earring” features photorealistic color representation and stereoscopic image impression, mimicking the texture of an oil-painting.

    更新日期:2020-09-20
  • Linewidth enhancement factor in a microcavity Brillouin laser
    Optica (IF 9.778) Pub Date : 2020-09-04
    Zhiquan Yuan, Heming Wang, Lue Wu, Maodong Gao, and Kerry Vahala

    The linewidth of regenerative oscillators is enhanced by amplitude–phase coupling of the oscillator field [Phys. Rev. 160, 290 (1967)]. In laser oscillators, this effect is well known for its impact on semiconductor laser performance. Here, this coupling is studied in Brillouin lasers. Because their gain is parametric, the coupling and linewidth enhancement are shown to originate from phase mismatch

    更新日期:2020-09-20
  • Periodical spectral peaking on optical pulses
    Optica (IF 9.778) Pub Date : 2020-08-25
    Norihiko Nishizawa and Masahito Yamanaka

    Using nonlinear optical effects, we can control the optical spectra in various ways. Here, we discovered a novel phenomenon in ultrafast nonlinear fiber optics, namely, periodical spectral peaking. A narrow spectral dip on a pulse turns into a sharp, intense peak through a nonlinear effect. This phenomenon shows periodical evolution behavior in the soliton regime. If we use absorption spectra with

    更新日期:2020-09-20
  • Optical parametric oscillation in silicon carbide nanophotonics
    Optica (IF 9.778) Pub Date : 2020-09-03
    Melissa A. Guidry, Ki Youl Yang, Daniil M. Lukin, Ashot Markosyan, Joshua Yang, Martin M. Fejer, and Jelena Vučković

    Silicon carbide (SiC) is rapidly emerging as a leading platform for the implementation of nonlinear and quantum photonics. Here, we find that commercial SiC, which hosts a variety of spin qubits, possesses low optical absorption that can enable SiC integrated photonics with quality factors exceeding ${10^7}$. We fabricate multimode microring resonators with quality factors as high as 1.1 million, and

    更新日期:2020-09-20
  • Ultralow jitter silica microcomb
    Optica (IF 9.778) Pub Date : 2020-08-28
    Dongin Jeong, Dohyeon Kwon, Igju Jeon, In Hwan Do, Jungwon Kim, and Hansuek Lee

    Silica microcombs have a high potential for generating tens of gigahertz of optical pulse trains with ultralow timing jitter, which is highly suitable for higher speed and higher bandwidth information systems. So far, the accurate characterization of timing jitter in microcombs has been limited by the measurement methods—although theoretically predicted to be ${\gt}{20 {\rm dB}}$ better performance

    更新日期:2020-09-20
  • Hybrid phase-matching for optical parametric amplification of few-cycle infrared pulses
    Optica (IF 9.778) Pub Date : 2020-08-25
    Enrico Ridente, Matthew Weidman, Mikhail Mamaikin, Clemens Jakubeit, Ferenc Krausz, and Nicholas Karpowicz

    Simple and compact laser systems facilitate the stable and reproducible generation of high-power few-cycle laser pulses. We demonstrate the amplification of 15 fs pulses at 2.1 µm, employing a hybrid phase-matching scheme for optical parametric chirped pulse amplification. A combination of two BBO crystals with type-I and type-II phase-matching placed in close vicinity is utilized as a single amplification

    更新日期:2020-09-20
  • Single molecule light field microscopy
    Optica (IF 9.778) Pub Date : 2020-08-21
    Ruth R. Sims, Sohaib Abdul Rehman, Martin O. Lenz, Sarah I. Benaissa, Ezra Bruggeman, Adam Clark, Edward W. Sanders, Aleks Ponjavic, Leila Muresan, Steven F. Lee, and Kevin O’Holleran

    We introduce single molecule light field microscopy (SMLFM), a new class of three-dimensional (3D) single molecule localization microscopy. By segmenting the back focal plane of a microscope objective with an array of microlenses to generate multiple 2D perspective views, the same single fluorophore can be imaged from different angles. These views, in combination with a bespoke fitting algorithm, enable

    更新日期:2020-09-20
  • Fourier optical preprocessing in lieu of deep learning
    Optica (IF 9.778) Pub Date : 2020-08-24
    Baurzhan Muminov and Luat T. Vuong

    Deep learning convolutional neural networks generally involve multiple-layer, forward-backward propagation machine-learning algorithms that are computationally costly. In this work, we demonstrate an alternative scheme to convolutional neural nets that reconstructs an original image from its optically preprocessed, Fourier-encoded pattern. The scheme is much less computationally demanding and more

    更新日期:2020-09-20
  • High-resolution label-free imaging of tissue morphology with confocal phase microscopy
    Optica (IF 9.778) Pub Date : 2020-09-04
    Martin Schnell, Shravan Gupta, Tomasz P. Wrobel, Michael G. Drage, Rohit Bhargava, and P. Scott Carney

    Label-free imaging approaches seek to simplify and augment histopathologic assessment by replacing the current practice of staining by dyes to visualize tissue morphology with quantitative optical measurements. Quantitative phase imaging (QPI) operates with visible/UV light and thus provides a resolution matched to current practice. Here we introduce and demonstrate confocal QPI for label-free imaging

    更新日期:2020-09-20
  • Silicon integrated microwave photonic beamformer
    Optica (IF 9.778) Pub Date : 2020-09-04
    Chen Zhu, Liangjun Lu, Wensheng Shan, Weihan Xu, Gangqiang Zhou, Linjie Zhou, and Jianping Chen

    Optical beam-forming networks (OBFNs) based on optical true-time delay lines (OTTDLs) are well known as the promising candidate for solving the bandwidth limitation of traditional electronic phased array antennas (PAAs) due to beam squinting. Here we report, to the best of our knowledge, the first monolithic $1 \times 8$ microwave photonic beamformer, based on switchable OTTDLs on the silicon-on-insulator

    更新日期:2020-09-20
  • Realization of high-dimensional frequency crystals in electro-optic microcombs
    Optica (IF 9.778) Pub Date : 2020-09-08
    Yaowen Hu, Christian Reimer, Amirhassan Shams-Ansari, Mian Zhang, and Marko Loncar

    Crystals are ubiquitous in nature and are at the heart of material research, solid-state science, and quantum physics. Unfortunately, the controllability of solid-state crystals is limited by the complexity of many-body dynamics and the presence of defects. In contrast, synthetic crystal structures, realized by, e.g., optical lattices, have recently enabled the investigation of various physical processes

    更新日期:2020-09-20
  • Long-lived elementary excitations and light coherence in topological lasers
    Optica (IF 9.778) Pub Date : 2020-08-21
    Petr Zapletal, Bogdan Galilo, and Andreas Nunnenkamp

    Combining topologically protected chiral light transport and laser amplification gives rise to topological lasers, whose operation is immune to fabrication imperfections and defects, uncovering the role of topology in a novel nonlinear non-Hermitian regime. We study a topological laser based on the photonic Haldane model with selective pumping of chiral edge modes described by saturable gain. We investigate

    更新日期:2020-09-20
  • Exact frequency and phase control of a terahertz laser
    Optica (IF 9.778) Pub Date : 2020-09-03
    Reshma A. Mohandas, Lalitha Ponnampalam, Lianhe Li, Paul Dean, Alwyn J. Seeds, Edmund H. Linfield, A. Giles Davies, and Joshua R. Freeman

    The accuracy of high-resolution spectroscopy depends critically on the stability, frequency control, and traceability available from laser sources. In this work, we report exact tunable frequency synthesis and phase control of a terahertz laser. The terahertz laser is locked by a terahertz injection phase lock loop for the first time, with the terahertz signal generated by heterodyning selected lines

    更新日期:2020-09-20
  • Additive manufacturing of highly reconfigurable plasmonic circuits for terahertz communications
    Optica (IF 9.778) Pub Date : 2020-08-31
    Yang Cao, Kathirvel Nallappan, Hichem Guerboukha, Guofu Xu, and Maksim Skorobogatiy

    While in most existing terahertz communications systems, the THz carrier wave is transmitted via free-space channels, the THz waveguide-based integrated solutions can be of great utility at both the transmitter and receiver ends, thus simplifying the miniaturization and mass production of cost-effective THz communications systems. Here we present a new type of modular THz integrated circuits based

    更新日期:2020-09-20
  • Doubly resonant second-harmonic generation of a vortex beam from a bound state in the continuum
    Optica (IF 9.778) Pub Date : 2020-09-03
    Jun Wang, Marco Clementi, Momchil Minkov, Andrea Barone, Jean-François Carlin, Nicolas Grandjean, Dario Gerace, Shanhui Fan, Matteo Galli, and Romuald Houdré

    Second-harmonic generation in nonlinear materials can be greatly enhanced by realizing doubly resonant cavities with high quality factors. However, fulfilling such doubly resonant condition in photonic crystal (PhC) slab cavities is a long-standing challenge, because of the difficulty in engineering photonic bandgaps around both frequencies. Here, by implementing a second-harmonic bound state in the

    更新日期:2020-09-20
  • Squeeze free space with nonlocal flat optics
    Optica (IF 9.778) Pub Date : 2020-09-03
    Cheng Guo, Haiwen Wang, and Shanhui Fan

    There has been substantial interest in miniaturizing optical systems by flat optics. However, one essential optical component, free space, fundamentally cannot be substituted with conventional local flat optics with space-dependent transfer functions, since the transfer function of free space is momentum-dependent instead. Overcoming this difficulty is important to achieve the utmost miniaturization

    更新日期:2020-09-20
  • Experimental observations of bright dissipative cavity solitons and their collapsed snaking in a Kerr resonator with normal dispersion driving
    Optica (IF 9.778) Pub Date : 2020-09-08
    Zongda Li, Yiqing Xu, Stéphane Coen, Stuart G. Murdoch, and Miro Erkintalo

    Driven Kerr nonlinear optical resonators can sustain localized structures known as dissipative Kerr cavity solitons, which have recently attracted significant attention as the temporal counterparts of microresonator optical frequency combs. While conventional wisdom asserts that bright cavity solitons can only exist when driving in the region of anomalous dispersion, recent theoretical studies have

    更新日期:2020-09-20
  • Boosting optical nonreciprocity: surface reconstruction in iron garnets
    Optica (IF 9.778) Pub Date : 2020-08-24
    Sushree S. Dash, Pinaki Mukherjee, Daniel Haskel, Richard A. Rosenberg, and Miguel Levy

    Bi-substituted iron garnet films are extensively used in the fabrication of nonreciprocal devices in optical telecommunications. The miniaturization of these devices for on-chip integration requires the development of more efficient magneto-optic materials than presently available. Recent evidence has emerged of large near-surface enhancements in the magneto-optic response in these materials. However

    更新日期:2020-09-20
  • Simultaneous multisurface measurement of freeform refractive optics based on computer-aided deflectometry
    Optica (IF 9.778) Pub Date : 2020-08-21
    Daodang Wang, Ping Xu, Zhendong Wu, Xiangyu Fu, Rengmao Wu, Ming Kong, Jian Liang, Bo Zhang, and Rongguang Liang

    Freeform optics, due to the more general surface geometry that offers high degrees of design freedom to control light propagation, has already been widely used in both nonimaging optics and imaging optics. With the recent advances in design and fabrication of freeform optics, one of the remaining challenges is how to accurately measure freeform optical surfaces, especially those included in freeform

    更新日期:2020-09-20
  • SI-traceable molecular transition frequency measurements at the 10−12 relative uncertainty level
    Optica (IF 9.778) Pub Date : 2020-09-09
    Z. D. Reed, D. A. Long, H. Fleurbaey, and J. T. Hodges

    Accurate and spectroscopic measurements of molecular transition frequencies are increasingly being employed in a variety of rigorous tests of physics, including the validity of quantum electrodynamics, the proton–electron mass ratio, and the dipole moment of the electron. Near-infrared molecular transitions may also underpin secondary frequency standards for length metrology and provide convenient

    更新日期:2020-09-20
  • Tunable geometric photocurrent in van der Waals heterostructure
    Optica (IF 9.778) Pub Date : 2020-09-08
    Abdullah Rasmita, Chongyun Jiang, Hui Ma, Zhurun Ji, Ritesh Agarwal, and Wei-bo Gao

    Utilizing the spin or valley degree of freedom is a promising approach for realizing more energy-efficient information processing devices. Circularly polarized light can be used to generate spin/valley current in monolayer 2D transition metal dichalcogenides. We observe a geometrically dependent photocurrent in heterostructure ${{\rm MoS}_2}/{{\rm WSe}_2}$, where light with a different circular polarization

    更新日期:2020-09-20
  • Experimental certification of quantum dimensions and irreducible high-dimensional quantum systems with independent devices
    Optica (IF 9.778) Pub Date : 2020-08-21
    Yong-Nan Sun, Zhao-Di Liu, Joseph Bowles, Geng Chen, Xiao-Ye Xu, Jian-Shun Tang, Chuan-Feng Li, and Guang-Can Guo

    Dimensionality plays an important role in various information-theoretic tasks and can be seen as a key resource for quantum information processing. In this work, for the first time to the best of our knowledge, we report an experimental test of classical and quantum dimensions in a prepare-and-measure scenario through a nonlinear dimension witness (NDW), where the preparer and the measurer have no

    更新日期:2020-09-20
  • Nanophotonic supercontinuum-based mid-infrared dual-comb spectroscopy
    Optica (IF 9.778) Pub Date : 2020-09-08
    Hairun Guo, Wenle Weng, Junqiu Liu, Fan Yang, Wolfgang Hänsel, Camille Sophie Brès, Luc Thévenaz, Ronald Holzwarth, and Tobias J. Kippenberg

    High resolution and fast detection of molecular vibrational absorption is important for organic synthesis, pharmaceutical processes, and environmental monitoring, and is enabled by mid-infrared (mid-IR) laser frequency combs via dual-comb spectroscopy. Here, we demonstrate a novel and highly simplified approach to broadband mid-IR dual-comb spectroscopy via supercontinuum generation, achieved using

    更新日期:2020-09-20
  • Grayscale stencil lithography for patterning multispectral color filters
    Optica (IF 9.778) Pub Date : 2020-09-04
    Xinhao Li, Zheng Jie Tan, and Nicholas X. Fang

    Flat optics for spatially resolved amplitude and phase modulation usually rely on 2D patterning of layered structures with spatial thickness variation. For example, Fabry–Perot-type multilayer structures have been applied widely as spectral filter arrays. However, it is challenging to efficiently fabricate large-scale multilayer structures with spatially variable thicknesses. Conventional photo/eB

    更新日期:2020-09-20
  • X-ray phase tomography with near-field speckles for three-dimensional virtual histology
    Optica (IF 9.778) Pub Date : 2020-09-11
    Marie-Christine Zdora, Pierre Thibault, Willy Kuo, Vincent Fernandez, Hans Deyhle, Joan Vila-Comamala, Margie P. Olbinado, Alexander Rack, Peter M. Lackie, Orestis L. Katsamenis, Matthew J. Lawson, Vartan Kurtcuoglu, Christoph Rau, Franz Pfeiffer, and Irene Zanette

    High-contrast, high-resolution imaging of biomedical specimens is indispensable for studying organ function and pathologies. Conventional histology, the gold standard for soft-tissue visualization, is limited by its anisotropic spatial resolution, elaborate sample preparation, and lack of quantitative image information. X-ray absorption or phase tomography have been identified as promising alternatives

    更新日期:2020-09-20
  • Nonreciprocal cavities and the time-bandwidth limit: reply
    Optica (IF 9.778) Pub Date : 2020-08-27
    Sander A. Mann, Dimitrios L. Sounas, and Andrea Alù

    We reply to the comment on our recent article [Optica 6, 104 (2019) [CrossRef] ], in which we demonstrated that nonreciprocal cavities comply with the resonance time-bandwidth limit. We fully stand by our original claims and further elucidate how breaking of reciprocity is not required to achieve the large field enhancements and time-bandwidth products observed in the comment and our article. We also

    更新日期:2020-09-20
  • Nonreciprocal cavities and the time-bandwidth limit: comment
    Optica (IF 9.778) Pub Date : 2020-08-27
    Kosmas L. Tsakmakidis, Yun You, Tomasz Stefański, and Linfang Shen

    In their paper in Optica 6, 104 (2019) [CrossRef] , Mann et al. claim that linear, time-invariant nonreciprocal structures cannot overcome the time-bandwidth limit and do not exhibit an advantage over their reciprocal counterparts, specifically with regard to their time-bandwidth performance. In this Comment, we argue that these conclusions are unfounded. On the basis of both rigorous full-wave simulations

    更新日期:2020-09-20
  • Three-photon neuronal imaging in deep mouse brain
    Optica (IF 9.778) Pub Date : 2020-08-07
    Tianyu Wang and Chris Xu

    Three-photon microscopy has been increasingly adopted for probing neural activities beyond the typical two-photon imaging depth. In this review, we outline the unique properties that differentiate three-photon microscopy from two-photon microscopy for in vivo imaging in biological samples, especially in the mouse brain. We present a systematic summary of the optimization of three-photon imaging parameters

    更新日期:2020-08-20
  • Bidirectional mode-locked all-normal dispersion fiber laser
    Optica (IF 9.778) Pub Date : 2020-08-07
    Bowen Li, Jian Xing, Dohyeon Kwon, Yijun Xie, Neeraj Prakash, Jungwon Kim, and Shu-Wei Huang

    The bidirectional mode-locked oscillator is an emerging light source architecture suitable for dual-comb applications. Therein, bidirectional mode-locked fiber lasers (MLFLs) are particularly promising for their cost effectiveness, system compactness, and environmental robustness. However, the pulse energy has been limited to tens of picojoules, restricting practical dual-comb applications, especially

    更新日期:2020-08-20
  • Electro-optically tunable laser with ultra-low tuning power dissipation and nanosecond-order wavelength switching for coherent networks
    Optica (IF 9.778) Pub Date : 2020-08-14
    Yuta Ueda, Takahiko Shindo, Shigeru Kanazawa, Naoki Fujiwara, and Mitsuteru Ishikawa

    The huge amount of data traffic behind the rapid growth of cloud computing is putting pressure on the operation of mobile fronthauls and data center networks so there is a need to improve their power consumption and latency. We developed an electro-optically tunable laser diode employing a tunable filter that is practically tuned even with small refractive index change of the electro-optic effect.

    更新日期:2020-08-20
  • Curved-field optical coherence tomography: large-field imaging of human corneal cells and nerves
    Optica (IF 9.778) Pub Date : 2020-07-23
    Viacheslav Mazlin, Kristina Irsch, Michel Paques, Jose-Alain Sahel, Mathias Fink, and Claude A. Boccara

    Cell-resolution optical imaging methods, such as confocal microscopy and full-field optical coherence tomography, capture flat optical sections of the sample. If the sample is curved, the optical field sections through several sample layers, and the view of each layer is reduced. Here we present curved-field optical coherence tomography, capable of capturing optical sections of arbitrary curvature

    更新日期:2020-08-20
  • Multifocus off-axis zone plates for x-ray free-electron laser experiments
    Optica (IF 9.778) Pub Date : 2020-08-14
    Florian Döring, Benedikt Rösner, Manuel Langer, Adam Kubec, Armin Kleibert, Jörg Raabe, Carlos A. F. Vaz, Maxime Lebugle, and Christian David

    X-ray free-electron lasers (XFELs) are paving the way towards new experiments in many scientific fields, such as ultrafast science, nonlinear spectroscopy, and coherent imaging. However, the strong intensity fluctuations inherent to the lasing process in these sources often lead to problems in signal normalization. In order to address this challenge, we designed, fabricated, and characterized diffractive

    更新日期:2020-08-20
  • Learned rotationally symmetric diffractive achromat for full-spectrum computational imaging
    Optica (IF 9.778) Pub Date : 2020-08-03
    Xiong Dun, Hayato Ikoma, Gordon Wetzstein, Zhanshan Wang, Xinbin Cheng, and Yifan Peng

    Diffractive achromats (DAs) promise ultra-thin and light-weight form factors for full-color computational imaging systems. However, designing DAs with the optimal optical transfer function (OTF) distribution suitable for image reconstruction algorithms has been a difficult challenge. Emerging end-to-end optimization paradigms of diffractive optics and processing algorithms have achieved impressive

    更新日期:2020-08-20
  • Tunable SIM: observation at varying spatiotemporal resolutions across the FOV
    Optica (IF 9.778) Pub Date : 2020-08-10
    Taeseong Woo, Su Hyun Jung, Cheolwoo Ahn, Byungjae Hwang, Hyunggee Kim, Joo H. Kang, and Jung-Hoon Park

    To date, imaging systems have generally been designed to provide an even spatiotemporal resolution across the field of view (FOV). However, this becomes a fundamental limitation when we aim to simultaneously observe varying dynamics at different parts of the FOV. In conventional imaging systems, to capture fast dynamics occurring at only a small portion of the FOV, the entire imaging system’s sampling

    更新日期:2020-08-20
  • Exceptional coupling in photonic anisotropic metamaterials for extremely low waveguide crosstalk
    Optica (IF 9.778) Pub Date : 2020-07-28
    Md Borhan Mia, Syed Z. Ahmed, Ishtiaque Ahmed, Yun Jo Lee, Minghao Qi, and Sangsik Kim

    Electromagnetic coupling is ubiquitous in photonic systems and transfers optical signals from one device to the other, creating crosstalk between devices. While this allows the functionality of some photonic components such as couplers, it limits the integration density of photonic chips, and many approaches have been proposed to reduce the crosstalk. However, due to the wave nature of light, complete

    更新日期:2020-08-20
  • In-phase/quadrature modulation using directly reflectivity-modulated laser
    Optica (IF 9.778) Pub Date : 2020-08-10
    Po Dong, Argishti Melikyan, Kwangwoong Kim, Noriaki Kaneda, Brian Stern, and Yves Baeyens

    In the last decade, coherent optical transmission technology has dominated the provision of high-capacity communications in metro and long-haul networks and is expected to expand to short-reach networks such as data center and passive optical networks. Capacities of more than 1.5 Tb/s have been demonstrated for a single wavelength. In-phase/quadrature (IQ) modulation allows information to be encoded

    更新日期:2020-08-20
  • Designing open channels in random scattering media for on-chip spectrometers
    Optica (IF 9.778) Pub Date : 2020-08-05
    Tianran Liu and Andrea Fiore

    On-chip spectrometers with tailored spectral range and compact footprint have been pursued widely in the last decade. Splitting different frequencies typically requires a propagation length that scales inversely with the frequency resolution, which leads to a trade-off between resolution and size. Scattering media in the diffusive regime provide a long light path and multipath interference in a compact

    更新日期:2020-08-20
  • Electrically injected GeSn lasers on Si operating up to 100 K
    Optica (IF 9.778) Pub Date : 2020-08-05
    Yiyin Zhou, Yuanhao Miao, Solomon Ojo, Huong Tran, Grey Abernathy, Joshua M. Grant, Sylvester Amoah, Gregory Salamo, Wei Du, Jifeng Liu, Joe Margetis, John Tolle, Yong-hang Zhang, Greg Sun, Richard A. Soref, Baohua Li, and Shui-Qing Yu

    Monolithic lasers on Si have long been anticipated as an enabler of full photonic integration, and significant progress in GeSn material development shows promise for such laser devices. While there are many reports focused on optically pumped lasers, in this work, we demonstrate electrically injected GeSn lasers on Si. We grew a GeSn/SiGeSn heterostructure diode on a Si substrate in a ridge waveguide

    更新日期:2020-08-20
  • Buildup and dissociation dynamics of dissipative optical soliton molecules
    Optica (IF 9.778) Pub Date : 2020-08-07
    Yi Zhou, Yu-Xuan Ren, Jiawei Shi, Huade Mao, and Kenneth K. Y. Wong

    Solitons can self-assemble into stable bound states, also denoted as soliton molecules that exhibit molecule-like dynamics. Soliton molecules have been predominantly investigated in the anomalous dispersion mode-locked fiber lasers. However, the soliton molecule dynamic evolution is still largely unexplored in the normal dispersion regime. We reveal here that, in the normal dispersion regime, the buildup

    更新日期:2020-08-20
  • Optical levitation using broadband light
    Optica (IF 9.778) Pub Date : 2020-08-03
    A. T. M. Anishur Rahman and P. F. Barker

    The ability to create dynamic, tailored optical potentials has become important across fields ranging from biology to quantum science. We demonstrate a method for the creation of arbitrary optical tweezer potentials using the broadband spectral profile of a superluminescent diode combined with the chromatic aberration of a lens. A tunable filter, typically used for ultrafast laser pulse shaping, allows

    更新日期:2020-08-20
  • Three-photon absorption spectra and bandgap scaling in direct-gap semiconductors
    Optica (IF 9.778) Pub Date : 2020-07-28
    Sepehr Benis, Claudiu M. Cirloganu, Nicholas Cox, Trenton Ensley, Honghua Hu, Gero Nootz, Peter D. Olszak, Lazaro A. Padilha, Davorin Peceli, Matthew Reichert, Scott Webster, Milton Woodall, David J. Hagan, and Eric W. Van Stryland

    This paper presents three-photon absorption (3PA) measurement results for nine direct-gap semiconductors, including full 3PA spectra for ZnSe, ZnS, and GaAs. These results, along with our theory of 3PA using an eight-band Kane model (four bands with double spin degeneracy), help to explain the significant disagreements between experiments and theory in the literature to date. 3PA in the eight-band

    更新日期:2020-08-20
  • Harmonic and rational harmonic driving of microresonator soliton frequency combs
    Optica (IF 9.778) Pub Date : 2020-08-07
    Yiqing Xu, Yi Lin, Alexander Nielsen, Ian Hendry, Stéphane Coen, Miro Erkintalo, Huilin Ma, and Stuart G. Murdoch

    With demonstrated applications ranging from metrology to telecommunications, soliton microresonator frequency combs have emerged over the past decade as a remarkable new technology. However, standard implementations allow only for the generation of combs whose repetition rate is tied closely to the fundamental resonator free-spectral range (FSR), offering little or no dynamic control over the comb

    更新日期:2020-08-20
  • Swimming force and behavior of optically trapped micro-organisms
    Optica (IF 9.778) Pub Date : 2020-08-11
    Declan J. Armstrong, Timo A. Nieminen, Alexander B. Stilgoe, Anatolii V. Kashchuk, Isaac C. D. Lenton, and Halina Rubinsztein-Dunlop

    We demonstrate how optical tweezers combined with a three-dimensional force detection system and high-speed camera are used to study the swimming force and behavior of trapped micro-organisms. By utilizing position sensitive detection, we measure the motility force of trapped particles, regardless of orientation. This has the advantage of not requiring complex beam shaping or microfluidic controls

    更新日期:2020-08-20
  • Common-clock very long baseline interferometry using a coherent optical fiber link
    Optica (IF 9.778) Pub Date : 2020-08-20
    Cecilia Clivati, Roberto Aiello, Giuseppe Bianco, Claudio Bortolotti, Paolo De Natale, Valentina Di Sarno, Pasquale Maddaloni, Giuseppe Maccaferri, Alberto Mura, Monia Negusini, Filippo Levi, Federico Perini, Roberto Ricci, Mauro Roma, Luigi Santamaria Amato, Mario Siciliani de Cumis, Matteo Stagni, Alberto Tuozzi, and Davide Calonico

    Among the most powerful techniques for the exploration of the Universe is very long baseline interferometry (VLBI), which is based on the simultaneous observation of radio sources in the sky with arrays of distant ground-based antennas. One of the effects currently limiting its ultimate sensitivity is the phase-instability of the reference clocks adopted at each antenna. This term can be made negligible

    更新日期:2020-08-20
  • Observation of rogue events in non-Markovian light
    Optica (IF 9.778) Pub Date : 2020-07-23
    Hadas Frostig, Itamar Vidal, Robert Fischer, Hanan Herzig Sheinfux, and Yaron Silberberg

    Efforts to understand the physics of rogue waves have motivated the study of mechanisms that produce rare, extreme events, often through analogous optical setups. As many studies have reported nonlinear generation mechanisms, recent work has explored whether optical rogue events can be produced in linear systems. Here we report the observation of linear rogue events with tunable height, generated from

    更新日期:2020-08-20
  • Spatial images from temporal data
    Optica (IF 9.778) Pub Date : 2020-07-31
    Alex Turpin, Gabriella Musarra, Valentin Kapitany, Francesco Tonolini, Ashley Lyons, Ilya Starshynov, Federica Villa, Enrico Conca, Francesco Fioranelli, Roderick Murray-Smith, and Daniele Faccio

    Traditional paradigms for imaging rely on the use of a spatial structure, either in the detector (pixels arrays) or in the illumination (patterned light). Removal of the spatial structure in the detector or illumination, i.e., imaging with just a single-point sensor, would require solving a very strongly ill-posed inverse retrieval problem that to date has not been solved. Here, we demonstrate a data-driven

    更新日期:2020-08-20
  • Exceptional points in polaritonic cavities and subthreshold Fabry–Perot lasers
    Optica (IF 9.778) Pub Date : 2020-08-14
    Jacob B. Khurgin

    We show that concept of parity-time (PT) symmetry can be expanded to include mixed photon-exciton modes by demonstrating that eigenmodes of active (pumped) strongly coupled cavity polaritons with population inversion exhibit characteristics that are remarkably akin to those of coupled photonic structures with parity-time symmetry. The exceptional point occurs when the Rabi splitting of polariton branches

    更新日期:2020-08-20
  • Virtual optical pulling force
    Optica (IF 9.778) Pub Date : 2020-08-17
    Sergey Lepeshov and Alex Krasnok

    Progress in light scattering engineering made it feasible to develop optical tweezers allowing capture, hold, and controllable displacement of submicrometer-size particles and biological structures. However, the momentum conservation law imposes a fundamental restriction on the optical pressure to be repulsive in paraxial fields, which severely limits the capabilities of optomechanical control, e.g

    更新日期:2020-08-20
  • Circularly polarized vacuum ultraviolet coherent light generation using a square lattice photonic crystal nanomembrane
    Optica (IF 9.778) Pub Date : 2020-07-22
    Kuniaki Konishi, Daisuke Akai, Yoshio Mita, Makoto Ishida, Junji Yumoto, and Makoto Kuwata-Gonokami

    Circularly polarized light in the vacuum ultraviolet (VUV) region is important for probing the structural and electronic properties of matter. Moreover, a circularly polarized VUV coherent light enables one to observe the dynamics of biomolecules and electron spins in solids. The development of a table-top technology to directly generate circularly polarized VUV coherent light is of great value, owing

    更新日期:2020-08-20
  • High-power few-cycle Cr:ZnSe mid-infrared source for attosecond soft x-ray physics
    Optica (IF 9.778) Pub Date : 2020-08-10
    Vyacheslav E. Leshchenko, Bradford K. Talbert, Yu Hang Lai, Sha Li, Yaguo Tang, Stephen J. Hageman, Greg Smith, Pierre Agostini, Louis F. DiMauro, and Cosmin I. Blaga

    The development of mid-infrared, high-energy pulses of extremely short pulse duration is of great importance to the strong-field physics community, as it enables extension of the high-harmonic cutoff towards the keV range of photon energies. Here we demonstrate a ${\rm{C}}{{\rm{r}}^{2 +}}:{\rm ZnSe}$ laser amplifier delivering 7 mJ, 100 fs pulses at 1 kHz repetition rate and 2.4 µm central wavelength

    更新日期:2020-08-20
  • In situ temporal measurement of ultrashort laser pulses at full power during high-intensity laser–matter interactions
    Optica (IF 9.778) Pub Date : 2020-08-11
    Helder M. Crespo, Tobias Witting, Miguel Canhota, Miguel Miranda, and John W. G. Tisch

    In laser–matter interaction experiments, it is of paramount importance to characterize the laser pulse on target (in situ) and at full power. This allows pulse optimization and meaningful comparison with theory, and it can shed fundamental new light on pulse distortions occurring in or on the target. Here we introduce and demonstrate a new technique based on dispersion-scan using the concurrent third

    更新日期:2020-08-20
  • Multi-layer Born multiple-scattering model for 3D phase microscopy: publisher’s note
    Optica (IF 9.778) Pub Date : 2020-08-04
    Michael Chen, David Ren, Hsiou-Yuan Liu, Shwetadwip Chowdhury, and Laura Waller

    This publisher’s note reports typographical corrections to Optica 7, 394 (2020) [CrossRef] .

    更新日期:2020-08-20
  • Polarization-insensitive ultra-broadband mode filter based on a 3D graphene structure buried in an optical waveguide
    Optica (IF 9.778) Pub Date : 2020-07-01
    Quandong Huang and Kin Seng Chiang

    We propose a polarization-insensitive ultra-broadband mode filter based on a 3D graphene structure buried in a few-mode optical waveguide. Our experimental device fabricated by burying an L-shaped graphene structure in a three-mode polymer waveguide provides polarization-insensitive filtering of the fundamental mode, while keeping the higher-order modes, with a mode extinction ratio of ${\sim}{{17}}\;{\rm{dB}}$

    更新日期:2020-07-21
  • Airy-beam tomographic microscopy.
    Optica (IF 9.778) Pub Date : 2020-07-13
    Jian Wang,Xuanwen Hua,Changliang Guo,Wenhao Liu,Shu Jia

    We introduce Airy-beam tomographic microscopy (ATM) for high-resolution, volumetric, inertia-free imaging of biological specimens. The work exploits the highly adjustable Airy trajectories in the 3D space, transforming the conventional telecentric wide-field imaging scheme that requires sample or focal-plane scanning to acquire 3D information. The results present a consistent near-diffraction-limited

    更新日期:2020-07-21
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