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  • High-speed reconfigurable free-space optical interconnects with carrierless-amplitude-phase modulation and filter-enhanced spatial modulation
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-28
    Ke Wang

    Optical technologies have been widely studied to satisfy the interconnect demand in high-performance computers and data centers, and free-space optical interconnects have been investigated for flexible card-to-card applications. To increase the interconnect speed and range, in this Letter we propose a reconfigurable free-space optical interconnect with 16-carrierless-amplitude-phase (16-CAP) symbol

    更新日期:2020-09-25
  • Intensity-noise suppression in 1950-nm single-frequency fiber laser by bidirectional amplifier configuration
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-28
    Xianchao Guan, Changsheng Yang, Wei Lin, Qilai Zhao, Tianyi Tan, Quan Gu, Kaijun Zhou, Xiaoming Wei, Zhongmin Yang, and Shanhui Xu

    In this Letter, a bidirectional amplifier configuration suppressing the relative intensity noise in a 1950-nm linearly polarized single-frequency fiber laser (SFFL) is proposed. The scheme to amplify the signal in a nonlinear saturated amplification regime with low gain distribution for suppressing the RIN is theoretically analyzed. By optimizing the input power level and reflectivity of the bidirectional

    更新日期:2020-09-25
  • Lithography-free flexible perfect broadband absorber in visible light based on an all-dielectric multilayer structure
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-28
    Jiancun Zhao, Yan Wang, Yechuan Zhu, Wei Zhang, and Yiting Yu

    A flexible broadband absorber based on an all-dielectric multilayer structure is proposed to get an average absorbance of 97.4%, covering the whole visible light. Additionally, such high absorption presents an extraordinary angular tolerance of up to ${\pm}{{50}}^\circ$. Due to the single broadband resonance in the highly lossy Fabry–Perot (F–P) cavity and the intrinsic loss property of Ge, the proposed

    更新日期:2020-09-25
  • Polarization-multiplexed Huygens metasurface holography
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-28
    Zhuochao Wang, Xumin Ding, Shengying Liu, Kuang Zhang, and Qun Wu

    Huygens metasurface, as a subcategory of metamaterials, shows great potential in the capacity and efficiency of electromagnetic wave manipulation within a subwavelength scale. Here, the transmission-type Huygens metasurface is demonstrated for complete and independent control of orthogonally polarized transmitted waves by constructing pairs of crossed electric and magnetic resonances in three-sheet

    更新日期:2020-09-25
  • Tuning temperature gradients in subwavelength plasmonic nanocones with tilted illumination
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-28
    Joao Cunha, Tian-Long Guo, Alessandro Alabastri, and Remo Proietti Zaccaria

    Inducing and controlling temperature gradients in illuminated subwavelength plasmonic structures is a challenging task. Here, we present a strategy to remotely induce and tune temperature gradients in a subwavelength metallic nanocone by adjusting the angle of incidence of linearly polarized continuous-wave illumination. We demonstrate, through rigorous three-dimensional numerical simulations, that

    更新日期:2020-09-25
  • Near-infrared single-photon emitters based on colloidal CdSe/CdS/ZnS nanocrystals and Nd(III) 1,3-diketonate
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-28
    Mikhail Metlin, Sergey Ambrozevich, Vladislav Korshunov, Vladimir Fedyanin, Peter Tananaev, and Ilya Taydakov

    A novel, to the best of our knowledge, approach to the design of the single-photon sources emitting in the spectral regions of 1060 and 1337 nm was developed. A unique hybrid structure based on colloidal CdSe/CdS/ZnS nanocrystals and neodymium(III) 1,3-diketonate was created. Direct energy transfer from the CdSe/CdS/ZnS single nanocrystal to the near-infrared (NIR) luminescent Nd(III) complex was observed

    更新日期:2020-09-25
  • Helical distributed feedback fiber Bragg gratings and rocking filters in a 3D printed preform-drawn fiber
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-25
    John Canning, Yitao Wang, Matthieu Lancry, Yanhua Luo, and Gang-Ding Peng

    Using induced UV attenuation across a twisted fiber asymmetric core drawn from a 3D printed preform, linear fiber Bragg gratings (FBGs) are produced on one side of the core. By removing the twist, a helical grating with a period matching the twist rate is produced. Balancing the rate with the polarization beat length in a form birefringent fiber allows the production of a combined rocking filter and

    更新日期:2020-09-24
  • Magnon laser based on Brillouin light scattering
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-25
    Zeng-Xing Liu and Hao Xiong

    An analogous laser action of magnons has become a subject of interest, and it is crucial for the study of nonlinear magnons spintronics. In this Letter, we demonstrate the magnon laser behavior based on Brillouin light scattering in a ferrimagnetic insulator sphere, which supports optical whispering gallery modes and magnon resonances. We show that the excited magnon plays what has traditionally been

    更新日期:2020-09-24
  • Light and corona: guided-wave readout for coronavirus spike protein–host-receptor binding
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-24
    Ilya V. Fedotov, Zhenhuan Yi, Aleksandr A. Voronin, Anatoly A. Svidzinsky, Kyle Sower, Xinghua Liu, Ekaterina Vlasova, Tao Peng, Xiangpei Liu, Sergey A. Moiseev, Vsevolod V. Belousov, Alexei V. Sokolov, Marlan O. Scully, and Aleksei M. Zheltikov

    We show that waveguide sensors can enable a quantitative characterization of coronavirus spike glycoprotein–host-receptor binding—the process whereby coronaviruses enter human cells, causing disease. We demonstrate that such sensors can help quantify and eventually understand kinetic and thermodynamic properties of viruses that control their affinity to targeted cells, which is known to significantly

    更新日期:2020-09-24
  • Modal-based nonlinear optimization algorithm for wavefront measurement with under-sampled data
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-25
    Lei Zhao, Jian Bai, Yan Hao, Hou Jing, Chen Wang, Binjie Lu, Yiyong Liang, and Kaiwei Wang

    The aliasing effect in the discrete Fourier transform inherent will impose a serious detrimental effect on conventional phase retrieval measurement accuracy with under-sampled intensity. In this Letter, we describe a modal-based nonlinear optimization phase retrieval approach that is capable of retrieving wavefront measurements using under-sampled intensities. The extended Nijboer–Zernike theory is

    更新日期:2020-09-24
  • Fast Brillouin optical time-domain reflectometry using the optical chirp chain reference wave
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-25
    Dexin Ba, Benzhang Wang, Tianfu Li, Yijia Li, Dengwang Zhou, and Yongkang Dong

    A new technique for the fast implementation of Brillouin optical time-domain reflectometry has been proposed and demonstrated with the optical chirp chain (OCC) reference wave. By using the fixed bandpass filter and envelope detection, the spontaneous Brillouin spectrum can be online demodulated in the time domain for truly distributed, one-end access and fast measurement. The measurement time is only

    更新日期:2020-09-24
  • Coherence time of a cold-atom laser below threshold
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-25
    Graeme Harvie, Adam Butcher, and Jon Goldwin

    We experimentally study the coherence time of a below-threshold Raman laser in which the gain medium is a gas of magneto-optically trapped atoms. The second-order optical coherence exhibits photon bunching with a correlation time that is varied by two orders of magnitude by controlling the gain. Results are in good agreement with a simple analytic model that suggests the effect is dominated by gain

    更新日期:2020-09-24
  • Fiber Bragg grating sensing system with wavelength-swept-laser distribution and self-synchronization
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-24
    Jiun-Yu Sung, Jin-Kai Chen, Shien-Kuei Liaw, Hiroki Kishikawa, and Nobuo Goto

    Fiber Bragg gratings (FBGs) with various interrogation schemes to estimate the FBG’s spectrum shift have been widely used in fiber sensing systems. Wavelength swept laser (WSL) based interrogation architectures have been proposed to offer rapid and high-quality sensing performance. However, for getting higher sensing accuracy, the demands for high-performance WSL may push the system cost. Under these

    更新日期:2020-09-23
  • Image recovery of ghost imaging with sparse spatial frequencies
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Dongyue Yang, Guohua Wu, Junhui Li, Chen Chang, Bin Luo, Huizu Lin, Shuai Sun, Yaokun Xu, and Longfei Yin

    When the spatial frequencies of the object are insufficiently sampled, the reconstruction of ghost imaging will suffer from repetitive visual artifacts, which cannot be effectively tackled by existing ghost imaging reconstruction techniques. In this Letter, extensions of the CLEAN algorithm applied in ghost imaging are explored to eliminate those artifacts. Combined with the point spread function estimation

    更新日期:2020-09-23
  • Asymmetric surface wave excitation through metasurface-edge diffraction
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-23
    Miguel Camacho, Filippo Capolino, and Matteo Albani

    The selective excitation of localized surface wave modes remains a challenge in the design of both leaky-wave and bound-wave devices. In this Letter, we show how the truncation of a metasurface can play an important role in breaking the spatial inversion symmetry in the excitation of surface waves supported by the structure. This is done by combining a large anisotropy in the dispersion relation and

    更新日期:2020-09-23
  • Laser-induced cavities with a controllable shape in nanoporous glass
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-23
    S. S. Fedotov, A. S. Lipatiev, M. Yu. Presniakov, G. Yu. Shakhgildyan, A. G. Okhrimchuk, S. V. Lotarev, and V. N. Sigaev

    The formation of birefringent structures inside nanoporous glass by femtosecond laser pulses was investigated. The laser-modified region is shown to be a cavity whose shape depends on the number of pulses. The shape of the void cross section varied from circle to ellipse when increasing the number of pulses from one to three. A layer of non-porous dense glass was revealed around the cavity. The cross

    更新日期:2020-09-23
  • Nonlinear frequency conversions via weak surface polaritonic wave breaking in a hybrid plasmonic waveguide
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-24
    Saeid Asgarnezhad-Zorgabad and Barry C. Sanders

    Material design and input field properties limit high-harmonic excitation efficiency of surface-plasmon polaritons (SPPs) in a nanoscopic device. We remedy these limitations by developing a concept for a plasmonic waveguide that exploits spatiotemporal control of a weak surface polaritonic field to create efficient four-wave mixing (FWM) and periodic phase singularities. Our configuration comprises

    更新日期:2020-09-23
  • Strongly confined atomic localization by Rydberg coherent population trapping
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-24
    Teodora Kirova, Ning Jia, Seyyed Hossein Asadpour, Jing Qian, Gediminas Juzeliūnas, and Hamid Reza Hamedi

    We investigate the possibility to attain strongly confined atomic localization using interacting Rydberg atoms in a coherent population trapping ladder configuration, where a standing-wave is used as a coupling field in the second leg of the ladder. Depending on the degree of compensation for the Rydberg level energy shift induced by the van der Waals interaction, by the coupling field detuning, we

    更新日期:2020-09-23
  • Photo-induced bleaching and thermally stimulated recovery of BAC-P in Bi-doped phosphosilicate fibers
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Qiancheng Zhao, Qun Hao, Yanhua Luo, Xiaochong Li, Shiyu Cui, Fengze Tan, Changyuan Yu, and Gang-Ding Peng

    The first results of the study on photobleaching and thermally induced recovery in Bi-doped phosphosilicate fiber have been presented. It was revealed that the rate of bleaching of phosphor-related Bi active center (BAC-P) becomes slower with the decrease of photon energy. The quadratic dependence of the bleaching rate of BAC-P on laser power is obtained under 532 nm laser irradiation. The effect of

    更新日期:2020-09-22
  • Highly efficient 110-W closed-cycle cryogenically cooled Nd:YAG laser operating at 946 nm
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    G. Shayeganrad, S. Cante, J. P. Mosquera, W. O. S. Bailey, and J. I. Mackenzie

    We report a new, to the best of our knowledge, record power and efficiency for a 946 nm Nd:YAG laser, producing ${\gt}{110}\;{\rm W}$ (${5}\;{{\rm TWm}^{- 2}}\;{{\rm sr}^{- 1}}$) with a slope efficiency of 80%, with respect to absorbed pump power, and an optical-to-optical efficiency of 74%, with respect to incident power. To achieve this performance, we utilized a closed-cycle acoustic Stirling cryostat

    更新日期:2020-09-22
  • Efficient all-solid-state passively Q-switched SWIR Tm:YAP/KGW Raman laser
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-22
    Eytan Perez, Uzziel Sheintop, Rotem Nahear, Gilad Marcus, and Salman Noach

    We present an all-passive efficient KGW Raman laser with an external-cavity configuration in the 2 µm spectral regime. The Raman laser was pumped by a passively ${Q}$-switched Tm:YAP laser emitting at 1935 nm. Due to the bi-axial properties of the KGW crystal, the laser exhibits stimulated Raman emission at two separate spectral lines: 2272 nm and 2343 nm. The output energies achieved at these two

    更新日期:2020-09-22
  • High-speed label-free ultraviolet photoacoustic microscopy for histology-like imaging of unprocessed biological tissues
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-22
    Xiufeng Li, Lei Kang, Yan Zhang, and Terence T. W. Wong

    Ultraviolet photoacoustic microscopy (UV-PAM) has recently been demonstrated as a potential imaging tool for surgical margin analysis (SMA). UV-PAM does not require staining or micrometer-thick slicing, which is inevitable in conventional histological imaging. To promote UV-PAM as a practical intraoperative diagnostic tool, the imaging speed should be improved while preserving the high-resolution imaging

    更新日期:2020-09-22
  • Virtual brightfield and fluorescence staining for Fourier ptychography via unsupervised deep learning
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-22
    Ruihai Wang, Pengming Song, Shaowei Jiang, Chenggang Yan, Jiakai Zhu, Chengfei Guo, Zichao Bian, Tianbo Wang, and Guoan Zheng

    Fourier ptychographic microscopy (FPM) is a computational approach geared towards creating high-resolution and large field-of-view images without mechanical scanning. Acquiring color images of histology slides often requires sequential acquisitions with red, green, and blue illuminations. The color reconstructions often suffer from coherent artifacts that are not presented in regular incoherent microscopy

    更新日期:2020-09-22
  • Soliton-sinc optical pulses
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Sergei K. Turitsyn, Stepan Bogdanov, and Alexey Redyuk

    We introduce a new, to the best of our knowledge, type of band-limited optical pulse—soliton-sinc tailored to the nonlinear Schrödinger (NLS) equation. The idea behind the soliton-sinc pulse is to combine, even if approximately, a property of a fundamental soliton to propagate without distortions in nonlinear systems governed by the NLS equation with a compact band-limited spectrum of a Nyquist pulse

    更新日期:2020-09-22
  • Enhanced saturable absorption in the laser-treated free-standing carbon nanotube films
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    V. V. Vanyukov, K. G. Mikheev, A. G. Nasibulin, Y. Svirko, and G. M. Mikheev

    We demonstrate an increase of optical transmittance and saturable absorption of laser-treated free-standing single-walled carbon nanotube (SWNT) films. The combined acid and low-power non-destructive laser treatment ensures an enhancement of linear transmittance across the visible range and double-digit increase of the saturable absorption of femtosecond laser radiation at 795 nm. The saturable absorption

    更新日期:2020-09-22
  • Fragility of a soliton’s shot-to-shot coherence
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    A. Antikainen, H. B. Kabagöz, and S. Ramachandran

    We show that a soliton in a high-order spatial mode of a multi-mode fiber can completely lose its shot-to-shot coherence due to a noise seed with energy orders of magnitude below that of the soliton. The total degradation of shot-to-shot coherence is caused by a very strong recently demonstrated intermodal nonlinear effect, soliton self-mode conversion. The results indicate that the robustness of solitons

    更新日期:2020-09-22
  • Anomalous bi-directional scanning electro-optic KTN devices with UV-assisted electron and hole injections
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Chang-Jiang Chen, Annan Shang, Yun Goo Lee, Ju-Hung Chao, Ruijia Liu, Shizhuo Yin, and Robert C. Hoffman

    In this Letter, we reported anomalous electro-optic potassium tantalate niobate (KTN) devices, in which both electrons and holes were injected into the KTN crystal via ultraviolet (UV) illumination-assisted charge injection. This could not only significantly enhance the performance of electro-optic devices (e.g., a 270% increase in the deflection angle in terms of the KTN deflector) but also enable

    更新日期:2020-09-22
  • Enhanced spontaneous emission from two-photon-pumped quantum dots in a porous silicon microcavity
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Dmitriy Dovzhenko, Victor Krivenkov, Irina Kriukova, Pavel Samokhvalov, Alexander Karaulov, and Igor Nabiev

    Photoluminescence (PL)-based sensing techniques have been significantly developed in practice due to their key advantages in terms of sensitivity and versatility of the approach. Recently, various nanostructured and hybrid materials have been used to improve the PL quantum yield and the spectral resolution. The near-infrared (NIR) fluorescence excitation has attracted much attention because it offers

    更新日期:2020-09-22
  • Chiral plasmonic metasurface absorbers in the mid-infrared wavelength range
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Md. Shamim Mahmud, Daniel Rosenmann, David A. Czaplewski, Jie Gao, and Xiaodong Yang

    Chiral metamaterials in the mid-infrared wavelength range have tremendous potential for studying thermal emission manipulation and molecular vibration sensing. Here, we present one type of chiral plasmonic metasurface absorber with high circular dichroism (CD) in absorption of more than 0.56 across the mid-infrared wavelength range of 5–5.5 µm. The demonstrated chiral metasurface absorbers exhibit

    更新日期:2020-09-22
  • Intrinsically reducing divergence angle of Cherenkov radiation from dielectric capillary
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-22
    Shimin Jiang, Weiwei Li, Zhigang He, Qika Jia, and Lin Wang

    Narrow-band terahertz (THz) Cherenkov radiation can be excited as a relativistic electron bunch passes through the dielectric capillary with sub-millimeter radius. However, due to the diffraction effect, the radiation will enter free space with a large divergence angle, which makes it difficult to collect the radiation energy efficiently. In this Letter, to deal with this challenge, we propose to add

    更新日期:2020-09-22
  • High-sensitivity temperature sensor based on anti-resonance in high-index polymer-coated optical fiber interferometers
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Xiaokang Lian, Qiang Wu, Gerald Farrell, and Yuliya Semenova

    Compared to the multimode interference (MMI) effect, the anti-resonance (AR) effect does not rely on the multimode property of the optical waveguide. This Letter shows that fiber bending can suppress the MMI and can break the superposition of AR spectra of multiple modes in a high-index polymer-coated optical fiber interferometer based on a single-mode fiber—polymer-coated no-core fiber—single-mode

    更新日期:2020-09-22
  • Photonic scanning receiver for wide-range microwave frequency measurement by photonic frequency octupling and in-phase and quadrature mixing
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Jingzhan Shi, Fangzheng Zhang, Yuewen Zhou, Shilong Pan, Yiping Wang, and De Ben

    A photonic scanning receiver with optical frequency scanning and electrical intermediate frequency envelope detection is proposed to implement wide-range microwave frequency measurement. This system applies photonic in-phase and quadrature frequency mixing to distinguish and measure the signals in two frequency bands that mirror each other. Combined with the photonic frequency octupling technique,

    更新日期:2020-09-22
  • Non-invasive single-shot recovery of a point-spread function of a memory effect based scattering imaging system
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Tengfei Wu, Jonathan Dong, and Sylvain Gigan

    Accessing the point-spread function (PSF) of a complex optical system is important for a variety of imaging applications. However, placing an invasive point source is often impractical, and estimating it blindly with multiple frames is slow and requires a complex nonlinear optimization. Here, we introduce a simple single-shot method to noninvasively recover the accurate PSF of an isoplanatic imaging

    更新日期:2020-09-22
  • Photoluminescence of optical windows excited with extreme ultraviolet radiation
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-22
    Jen-Iu Lo, Yu-Chain Peng, Hsiao-Chi Lu, and Bing-Ming Cheng

    Upon excitation with extreme ultraviolet (EUV) radiation, optical windows ${{\rm CaF}_2}$ and sapphire emit strong photoluminescence (PL) in the ultraviolet region 200–400 nm. The spectral profiles of the windows observed in the PL spectra appear strongly dependent on their temperature. We suggest the use of PL spectra of ${{\rm CaF}_2}$ and sapphire excited with EUV light to indicate the temperature

    更新日期:2020-09-22
  • Trapped excited electrons in Ni2+-doped perovskite KZnF3 nanocrystals in KF–ZnF2–SiO2 glass ceramics: publisher’s note
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Dashuang Ding, Yanlong Wang, Changgui Lin, Shaoqian Zhang, and Liping Duo

    This publisher’s note contains a correction to Opt. Lett. 45, 4984 (2020) [CrossRef] .

    更新日期:2020-09-22
  • High-speed PAM4 transmission with a GeSi electro-absorption modulator and dual-path neural-network-based equalization
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Xiaoke Ruan, Fan Yang, Lei Zhang, Hao Ming, Yanping Li, and Fan Zhang

    Equalization based on artificial neural networks (NN) has proved to be an effective way for nonlinearity mitigation in various kinds of optical communication systems. In this Letter, we propose a novel methodology of dual-path neural network (DP-NN)-based equalization. By combining a linear equalizer with an input-pruned NN equalizer, DP-NN can effectively reduce the computation cost compared to a

    更新日期:2020-09-20
  • Linear-in-wavenumber actively-mode-locked wavelength-swept laser
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Hwidon Lee, Gyeong Hun Kim, Martin Villiger, Hansol Jang, Brett E. Bouma, and Chang-Seok Kim

    We report on an akinetic actively-mode-locked wavelength-swept laser (ASL) with a sweep that is highly linear in wavenumber. By tailoring the drive waveform of the intracavity modulator, the wavenumber sweep was further linearized to enable high fidelity frequency-domain interferometric ranging without resampling of the acquired data. Used for catheter-based optical coherence tomography, the ASL showed

    更新日期:2020-09-20
  • Nonlinear optical process of second-order nonlinear optical susceptibility ${\chi}_{133}^{(2)}$ in an organic nonlinear optical crystal DAST
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Kei Takeya, Takayuki Kamei, Kodo Kawase, and Hirohisa Uchida

    A large unexamined second-order nonlinear optical (NLO) process is found in a 4-N,N-dimethylamino-4’-N’-methyl stilbazolium tosylate (DAST) crystal, which has a large figure of merit among NLO crystals. In second-order NLO processes using a DAST crystal, the ${\chi}_{111}^{(2)}$ process of light excitation is commonly used, involving a-axis polarized light excitation with light generation of a-axis

    更新日期:2020-09-20
  • Voltage-controlled liquid crystal Pancharatnam–Berry phase lens with broadband operation and high photo-stability
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Chun-Ta Wang, Alwin Tam, Cuiling Meng, Man-Chun Tseng, Guijun Li, and Hoi-Sing Kwok

    Pancharatnam–Berry phase optical elements (PBOEs) have received much attention due to their ability to generate complex structured light or to manipulate the shape of a light beam. This work demonstrates a tunable liquid crystal (LC) Pancharatnam–Berry (LCPB) lens using a simple and cost-effective PB phase hologram optical setup and thermal polymerization to form an irreversible photo-patterning alignment

    更新日期:2020-09-20
  • Efficient interrogation method of forward Brillouin scattering in optical fibers using a narrow bandwidth long-period grating
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    L. A. Sánchez, A. Díez, J. L. Cruz, and M. V. Andrés

    A new technique, to the best of our knowledge, for the characterization of the effective refractive index modulation in optical fibers due to transverse acoustic mode resonances excited by electrostriction is reported. The resonances excited by an optical pulse are probed by a narrow bandwidth long-period grating (LPG) inscribed in the fiber, which is interrogated by a continuous wave (CW) beam. The

    更新日期:2020-09-20
  • 2 λ switch
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Akhilesh S. P. Khope, Songtao Liu, Zeyu Zhang, Andrew M. Netherton, Rebecca L. Hwang, Aaron Wissing, Jesus Perez, Franklin Tang, Clint Schow, Roger Helkey, Rod C. Alferness, Adel A. M. Saleh, and John E. Bowers

    We demonstrate an elastic multi-wavelength selective switch with up to two wavelength switching capability per crosspoint. We fabricated the switch in a silicon photonics foundry and demonstrated a 17 nm tuning range for ring resonators, with a mean path loss of 2.43 dB. This is a 70% reduction in path loss as compared to previous generations, and we demonstrate a high-speed pulse-amplitude-modulation-4

    更新日期:2020-09-20
  • Direct hyperspectral dual-comb gas imaging in the mid-infrared
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Farid Ullah Khan, Guillermo Guarnizo, and Pedro Martín-Mateos

    In this Letter, we present and experimentally validate the first direct hyperspectral dual-comb gas imaging system operating in the mid-infrared region. This method provides an unmatched combination of super-fine spectral characterization and high temporal resolution without the need for thermal contrast between the target molecules and the background. In a proof-of-concept experiment, the system has

    更新日期:2020-09-20
  • Tunable multiresonance using complementary circular metamaterial: publisher’s note
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-21
    Fengwei Zhan and Yu-Sheng Lin

    This publisher’s note contains corrections to Opt. Lett. 45, 3633 (2020) [CrossRef] .

    更新日期:2020-09-20
  • 11 W YLF-based intra-cavity pumped Ho laser with near diffraction limited beam quality
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-17
    Haizhou Huang, Huawen Hu, Jing Deng, Jinghui Li, Jiangdian Zhang, Hui Zheng, and Wenxiong Lin

    We develop a fluoride-based intra-cavity pumped Ho laser for the first time, where the severe thermal lensing of the intra-cavity pumping mechanism can be compensated by the negative thermal-optical property of the ${\rm{YLi}}{{\rm{F}}_4}$ (YLF) host. A maximum output power of 11.3 W ($\pi$-pol) at 2062 nm, corresponding to a conversion efficiency of 28.2% from the incident diode laser to the Ho laser

    更新日期:2020-09-17
  • Resonant bending of silicon nanowires by incident light
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-17
    Evgeny N. Bulgakov and Almas F. Sadreev

    Coupling of two dielectric wires with a rectangular cross section gives rise to bonding and anti-bonding resonances. The latter is featured by extremal narrowing of the resonant width for variation of the aspect ratio of the cross section and distance between wires. A plane wave resonant to this anti-bonding resonance gives rise to unprecedent enhancement of the optical forces up to several nano Newtons

    更新日期:2020-09-16
  • Chalcogenide fibers for Kerr squeezing
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-17
    Elena A. Anashkina, Alexey V. Andrianov, Joel F. Corney, and Gerd Leuchs

    We propose and investigate theoretically the Kerr squeezing of light at a wavelength of 2 µm in chalcogenide fibers with large nonlinearity and—this is the advance—with much reduced attenuation. We present suitably realistic but straightforward designs of low-loss step-index single-mode fibers with the nonlinear Kerr coefficient 3 to 4 orders of magnitude higher than for standard telecommunication

    更新日期:2020-09-16
  • Topological edge states of nonequilibrium polaritons in hollow honeycomb arrays
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-17
    Xuekai Ma, Yaroslav V. Kartashov, Albert Ferrando, and Stefan Schumacher

    We address topological currents in polariton condensates excited by uniform resonant pumps in finite honeycomb arrays of microcavity pillars with a hole in the center. Such currents arise under combined action of the spin–orbit coupling and Zeeman splitting, which breaks the time-reversal symmetry and opens a topological gap in the spectrum of the structure. The most representative feature of this

    更新日期:2020-09-16
  • Modified deep-learning-powered photonic analog-to-digital converter for wideband complicated signal receiving
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-17
    Shaofu Xu, Jun Wan, Rui Wang, and Weiwen Zou

    We propose and demonstrate a modified deep-learning-powered photonic analog-to-digital converter (DL-PADC) in which a neural network is used to eliminate the signal distortions of the photonic system. This work broadens the receiving capability from simple waveforms to complicated waveforms via implementing a modified deep learning algorithm. Thus, the modified DL-PADC can be applied in real scenarios

    更新日期:2020-09-16
  • Indoor optical wireless communication system with filters-enhanced generalized spatial modulation and carrierless amplitude and phase (CAP) modulation.
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-03
    Ke Wang

    The spatial modulation principle has been widely studied in indoor optical wireless communication (OWC) systems to provide high-speed connections to users by encoding part of data in the spatial domain. To further increase the speed and to eliminate the requirements of accurate channel state information (CSI) and low channel correlation, in this Letter we propose and demonstrate an indoor OWC system

    更新日期:2020-09-16
  • Compact and broad wavelength range tunable orbital angular momentum mode generator based on cascaded helical photonic crystal fibers.
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-04
    Cailing Fu,Pengfei Li,Zhiyong Bai,Shen Liu,Yiping Wang

    A compact and broad wavelength range tunable orbital angular momentum (OAM) generator was experimentally demonstrated by cascading two helical photonic crystal fibers (HPCFs) with opposite helicity, i.e., clockwise-twisted $+$ anticlockwise-twisted HPCF. Such an OAM generator exhibited a length of approximately 9 mm and generated a high-quality OAM mode with a wavelength range of 35 nm. Moreover, the

    更新日期:2020-09-16
  • Nonlinearity-aware optoelectronic terahertz discrete multitone signal transmission with a zero-bias diode.
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-04
    Lu Zhang,Mengyao Qiao,Shiwei Wang,Zijie Lu,Le Zhang,Xiaodan Pang,Xianmin Zhang,Xianbin Yu

    The terahertz band has been recognized as a promising candidate to support future rate-greedy applications such as 6G communications. Optoelectronic terahertz communications are beneficial for the realization of high-speed transmission. In this Letter, we propose and experimentally demonstrate an optoelectronic terahertz transmission system with intensity modulation and direct detection, where a discrete

    更新日期:2020-09-16
  • Training data generation and validation for a neural network-based equalizer.
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-10
    Tao Liao,Lei Xue,Luyao Huang,Weisheng Hu,Lilin Yi

    The neural network (NN) has been widely used as a promising technique in fiber optical communication owing to its powerful learning capabilities. The NN-based equalizer is qualified to mitigate mixed linear and nonlinear impairments, providing better performance than conventional algorithms. Many demonstrations employ a traditional pseudo-random bit sequence (PRBS) as the training and test data. However

    更新日期:2020-09-16
  • Measuring the shape of microbends in optical fibers.
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-14
    Raja Ahmad,Wing Ko,Kenneth S Feder,Paul S Westbrook

    We report on the distributed shape measurement of small deformations produced along the length of an optical fiber. The fiber contains multiple waveguiding cores, each inscribed with weak continuous Bragg gratings. The distributed Bragg-reflectivity data for the fiber cores, obtained from the optical backscatter reflectometry, are used to estimate the local curvature and the position of the fiber.

    更新日期:2020-09-16
  • Active demultiplexer enabled mmW ARoF transmission of directly modulated 64-QAM UF-OFDM signals.
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-14
    Syed Tajammul Ahmad,Prajwal D Lakshmijayasimha,Colm Browning,Prince M Anandarajah,Amol Delmade,Liam P Barry,Aleksandra Kaszubowska-Anandarajah

    In this Letter, we experimentally demonstrate an unamplified analog RoF distribution of 60 GHz 5G signals. The system entails the heterodyning of two optical tones from an externally injected gain switched laser (EI-GSL) based optical frequency comb to generate a millimeter wave (mmW) signal. A fixed frequency separation and a high level of phase correlation, between the EI-GSL comb lines, results

    更新日期:2020-09-16
  • 16-QAM probabilistic constellation shaping by adaptively modifying the distribution of transmitted symbols based on errors at the receiver.
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-15
    Ahmad Fallahpour,Fatemeh Alishahi,Amir Minoofar,Kaiheng Zou,Ahmed Almaiman,Peicheng Liao,Hubin Zhou,Moshe Tur,Alan E Willner

    We simulate and experimentally demonstrate a feedback-based probabilistic constellation shaping (FB-PCS) of a 10 Gbaud 16-ary quadrature amplitude modulation (16-QAM) signal. Our approach is to adaptively modify the distribution of transmitted symbols based on errors at the receiver, and assumptions about the channel model are not required. Specifically, the error feedback enables solving an optimization

    更新日期:2020-09-16
  • Optimization of linear signal processing in photon counting lidar using Poisson thinning.
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-14
    Matthew Hayman,Robert A Stillwell,Scott M Spuler

    Photon counting lidar signals generally require smoothing to suppress random noise. While the process of reducing the resolution of the profile reduces random errors, it can also create systematic errors due to the smearing of high gradient signals. The balance between random and systematic errors is generally scene dependent and difficult to find, because errors caused by blurring are generally not

    更新日期:2020-09-16
  • Learning complex scattering media for optical encryption.
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-15
    Lina Zhou,Yin Xiao,Wen Chen

    Optical encryption has provided a new insight for securing information; however, it is always desirable that high security can be achieved to withstand the attacks. In this Letter, we propose a new method via learning complex scattering media for optical encryption. After the recordings through complex scattering media, a designed learning model is trained. The proposed method uses an optical setup

    更新日期:2020-09-16
  • Photo-magnetic recording of randomized holographic diffraction patterns in a transparent medium.
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-14
    Joanna Starobrat,Antoni Frej,Jan Bolek,Rafał Jan Trybus,Andrzej Stupakiewicz,Michał Makowski

    Reconstructions from computer-generated holograms exhibit spurious duplicate images corresponding to higher diffractive orders, originating from the periodic pixels of a spatial light modulator. We explore the possibility of reducing their visibility by randomization of pixel positions at the stage of displaying of the holograms. Experimental validation is shown on a liquid crystal modulator and also

    更新日期:2020-09-16
  • Quantitative phase imaging based on wavefront correction of a digital micromirror device.
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-04
    Jing Hu,Xiwei Xie,Yibing Shen

    The strong need in materials and biological science has prompted the development of high-speed quantitative phase imaging. However, for phase retrieval applying digital micromirror devices (DMDs), the accuracy of the retrieved phase will be disturbed by the DMD-induced aberrations. Here, we propose a phase retrieval method based on measuring and correcting errors caused by phase non-uniformity of the

    更新日期:2020-09-16
  • Fast automatic design method for freeform imaging systems through system construction and correction.
    Opt. Lett. (IF 3.714) Pub Date : 2020-09-11
    Weichen Wu,Hui Wang,Guofan Jin,Jun Zhu

    In traditional optical design, a starting point is selected and coefficients optimization is then performed using software. The process requires considerable time and the involvement of a human with design skills and experience. In this Letter, a fast automatic method for freeform imaging systems design is proposed. Using a plane system as the input, a freeform optical system with high image quality

    更新日期:2020-09-16
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