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Wide-angle ultra-wideband metamaterial absorber based on complex dielectric layer in long and very long-wave infrared Opt. Commun. (IF 2.4) Pub Date : 2024-03-11 Chen Xiangtao, Zhongzhu Liang, Shi Xiaoyan, Yang Fuming, Dai Rui, Dong Yongjun, Jia Yan, Wei Xintong, Hou Enzhu, Wu Zhe
Long and very long-wave infrared are the most important bands in infrared detection technology because of their high atmospheric window radiation energy. At present, long and very long-wave infrared detectors are widely used in atmospheric monitoring, night reconnaissance, deep space exploration and other fields. In this paper, we first analyze the coupling resonance in the dual-band absorber (Ti–Si–Ti)
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Non-volatile double-tunable vortex metalens design based on Sb2S3 using deep neural network and particle swarm optimization algorithm Opt. Commun. (IF 2.4) Pub Date : 2024-03-11 Yuqing Zhang, Yiyi Zhang, Jin Deng, Zihan Shen, Zhicheng Wang, Yilu Wu, Yuqi Hu, Chengzhi Huang, Jiagui Wu, Junbo Yang
A dual-tunable vortex metalens is proposed that leverages deep neural network (DNN) and particle swarm optimization algorithm (PSO), incorporating the use of the phase-change material SbS, which enables simultaneous tunable of both the focal length of the focused vortex beam and the topological charge. The control of traditional vortex metalens relies on changing the polarisation state of the incident
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Wavelength-multiplexed meta-image displays with malus-assisted metasurface Opt. Commun. (IF 2.4) Pub Date : 2024-03-11 Lei Zhu, Zhen Zou, Yang Li, Liang Dong
A wavelength-multiplexed metasurface for four-channel display is proposed in this paper benefiting from the orientation degeneracy implied in Malus's law. We construct the meta-atom by placing two nanorods with different sizes on a substrate, which can achieve amplitude manipulation at different wavelengths. The wavelength-multiplexed metasurface composed of these meta-atoms can display four independent
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Symbol cyclic shift-based DFT precoding for OTFS-VLC systems Opt. Commun. (IF 2.4) Pub Date : 2024-03-11 Qinghui Chen, Liu Kexiong, Hong Wen, Dalong Mo, Jie Ma, Ming Chen
In this paper, a symbol cyclic shift-based discrete Fourier transform (SCS-DFT) precoding for orthogonal time frequency space (OTFS) is proposed and experimentally demonstrated in the visible light communication (VLC) system. The proposed scheme effectively mitigates the channel fading effect of edge subcarriers caused by inter-symbol interference (ISI) when there is no cyclic prefix (CP) in OTFS.
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Corrigendum to “Photocarrier dynamics in thick Si film studied by optical pump-terahertz probe spectroscopy” [OPTICS 554C (2024) OPTICS_130139] Opt. Commun. (IF 2.4) Pub Date : 2024-03-11 Takeshi Moriyasu, Masahiko Tani, Hideaki Kitahara, Takashi Furuya, Jessica Afalla, Toshiro Kohmoto, Daishiro Koide, Hiroki Sato, Mitsutaka Kumakura
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Surface plasmons of triangular cluster consisting of three 6H-SiC cylinders illuminated by H polarized cylindrical electromagnetic incident wave Opt. Commun. (IF 2.4) Pub Date : 2024-03-09 N, i, k, i, t, a, , D, ., , A, n, i, u, t, i, n
The surface plasmons properties of H cylindrical wave scattered by 2D triangular cluster consisting of three silicon carbide (6H-SiC) cylinders are investigated in this paper. Rigorous numerical procedures are used to study the plasmons resonances in such structure. The behaviors of the scattering cross section, the field distribution on the cylinder’s surface, spatial structure of the near field in
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Reinforcement learning-based resource allocation for dynamic aggregated WiFi/VLC HetNet Opt. Commun. (IF 2.4) Pub Date : 2024-03-09 Liujun Luo, Bo Bai, Xiaowei Zhang, Guoqing Han
High transmission rates and low power consumption make visible light communication (VLC) a highly promising supplementary technology for the next generation of mobile communication. Taking into account the limited coverage area, VLC can be combined with WiFi as a heterogeneous network (HetNet), thanks to their non-overlapping spectrum. In order to fully utilize the advantages of the WiFi and VLC technologies
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Algorithmically calibrated optical switch with high-extinction-ratio and low-polarization-dependence on 3-μm-thick SOI platform Opt. Commun. (IF 2.4) Pub Date : 2024-03-08 Ang Li, Nengyang Zhao, Chenyang Liu, Ruotian Lu, Ruxue Wang, Chao Qiu, Aimin Wu
Crosstalk, calibration complexity, and polarization dependence obstacle the precision of optical networks such as microwave photonics beamforming networks (MPBNs). The optical switch presented in this work, boasting high tolerance and polarization insensitivity, utilizes multimode interferometers (MMIs), a thermo-optical phase shifter, and variable optical attenuators (VOAs) on the 3μm-thick silicon-on-insulator
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A high resolution prism-grating panoramic imaging spectrometer based on occultation observations Opt. Commun. (IF 2.4) Pub Date : 2024-03-08 Lei Zhang, Jinhuan Li, Hanshuang Li, Pengfei Zhang, Aiming Zhou, Bo Li, Guanyu Lin, Guochao Gu, Xiaoxu Wang
Occultation observation is an important technique for shadow region detection and a significant complement to the illuminated region detection method. This technology will significantly reduce the impact of background light pollution and provide clearer occultation signals. In order to achieve high-resolution all-round detection in the shadow region, this paper introduces a proposal for a prism-grating
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DAE-nest: A depth information extraction and enhancement fusion network for infrared and visible images Opt. Commun. (IF 2.4) Pub Date : 2024-03-07 Peicheng Shi, Fei Mao, Rongyun Zhang
Fusion of information from infrared and visible images from different modalities has always been a hot research topic in the field of image processing. In order to solve the problem that existing fusion methods cannot fully utilize the deep information of images, this paper proposes a fusion algorithm DAE-Nest based on depth information extraction and enhancement. The algorithm consists of encoder-feature
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Joint focusing method based on optimal image-distance interval for multi-image-distance imaging system Opt. Commun. (IF 2.4) Pub Date : 2024-03-07 Zhenguo Wu, Jixiang Tang, Xuanyin Wang, Kexin Wang
The multi-image-distance imaging system captures multiple images simultaneously with different focused depths, and uses image fusion to obtain an all-in-focus image for extending the depth of field (DoF). However, an image-distance adjustment strategy that takes into account the optimal DoF extension capability and imaging quality remains to be explored. In this paper, we propose a joint focusing method
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Photonics-assisted simultaneous frequency and angle-of-arrival measurement using parameter mapping method Opt. Commun. (IF 2.4) Pub Date : 2024-03-07 Qingqing Meng, Guodong Wang, Shanghong Zhao, Zhicheng Wen, Yixiao Zhou, Zihang Zhu
A photonics-assisted simultaneous frequency and angle of arrival (AOA) measurement system based on parameter mapping method is proposed and demonstrated by simulation and experiment. Using optical sideband sweeping and envelope detection, the frequencies of the signals under test (SUT) are mapped to the time domain of the output amplitude of the electrical pulses, and the AOA-dependent phase differences
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Color-based particle-field deep learning computed tomography with impurity-noise suppression Opt. Commun. (IF 2.4) Pub Date : 2024-03-06 Yue Shi, Ming Zheng, Yuhong Wang, Hanxu Tai, Jian Wu
High-quality particle image characterization based on computed tomography is always highly desired in the area of hydrodynamics and relevant applications, as the time-space particle distribution in a flow-field can reflect the field properties well. However, how to eliminate the influence of impurity-in-fluid on the particle-field computed tomography is still a challenge at present. In this paper,
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Designing ultra-broadband terahertz polarization converters based on the transformer model Opt. Commun. (IF 2.4) Pub Date : 2024-03-06 Binguxan Mao, Honghao Chang, Xiaohua Xing, Qiankun Zhang, Die Zou, Yin Liu, Jianquan Yao, Haixia Bi, Liang Wu
Polarization, a fundamental property of terahertz (THz) waves, can be controlled using metasurfaces for signal transmission and sensitive measurements. However, conventional methods for designing polarization-conversion metasurfaces require numerous numerical simulation iterations and trial and error attempts that are computationally intensive and time-consuming, necessitating a more rapid and efficient
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A convenient acoustic measurement of femtosecond filamentation based on a cell phone Opt. Commun. (IF 2.4) Pub Date : 2024-03-06 Bei Wang, Zuoqiang Hao, Long He, Wenjie Zhong, Dongwei Li, Jianghao Li, Yangjian Cai, Lanzhi Zhang
The acoustic diagnostic method has been widely used in diagnosing femtosecond filamentation. In this work, acoustic measurements of femtosecond laser filamentation and weakly air-ionized region are conducted using a readily available portable device - a cell phone. The signal is extracted by employing digital signal processing method of Fourier transformation filtering. The results demonstrate that
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A calibration and prediction method of the camera imaging parameters in variable temperature environment Opt. Commun. (IF 2.4) Pub Date : 2024-03-06 Qilin Liu, Mingli Dong, Peng Sun, Bixi Yan, Jun Wang, Lianqing Zhu
In the on-orbit application of photogrammetry, constraints on thermal control resources or aging of thermal control equipment will trigger increased fluctuations in the camera operating environment temperature. Consequently, the parameters of the camera imaging model vary, such that the measurement accuracy is reduced. Accordingly, the accurate prediction of the camera imaging parameters (e.g., Camera
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Decoding scheme based on CNN for differential free space optical communication system Opt. Commun. (IF 2.4) Pub Date : 2024-03-06 Jinji Zheng, Xicai Li, Shengzhi Qiang, Yuanqin Wang
A high-speed and robust decoding algorithm based on Convolutional Neural Networks (CNN) is proposed for differential free space optical communication system. The system adopts bipolar complementary pulse width modulation (BCPWM) that can enhance the amplitude of the signal and avoid interference from common mode signals in a single channel system. In addition, BCPWM has amplitude and envelope characteristics
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Performance enhancement of RIS-assisted MRR-UOWC systems using the spectral-power-efficient [formula omitted]QAM-MPPM Opt. Commun. (IF 2.4) Pub Date : 2024-03-05 Amr G. AbdElKader, Ahmed Allam, Kazutoshi Kato, Hossam M.H. Shalaby
Reconfigurable Intelligent Surfaces (RISs), proposed as innovative units, possess the potential to establish reliable connections in Underwater Optical Wireless Communication (UOWC) systems, where direct transmission (DT) experiences significant weakening due to dynamic channel conditions. In this paper, we examine the performance of a UOWC system consisting of an RIS and a modulating retroreflector
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Ring airy Gaussian vortex beam dynamics in harmonic PT symmetric potential Opt. Commun. (IF 2.4) Pub Date : 2024-03-05 Shakti Singh, Akhilesh Kumar Mishra
Abruptly autofocusing (AAF) beams have spurred a surge of research interests in the field of optics and photonics due to their remarkable characteristics. These unique beams have found transformative applications including the precision manipulation of objects through optical tweezers, and free-space optical communications. In the present work, we numerically investigate the dynamics of ring Airy Gaussian
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Ultrahigh-sensitivity optical fiber sensor based on the virtual harmonic vernier effect Opt. Commun. (IF 2.4) Pub Date : 2024-03-05 Haiming Qiu, Ying Gao, Jiajun Tian, Yong Yao
This paper proposes a fiber-optic sensor based on the virtual harmonic Vernier effect (VHVE). The VHVE is obtained by processing the spectrum of the traditional Vernier effect (TVE). We demonstrate that the periodic outer envelope and the high-frequency fringes in the TVE can be used as the spectra of the virtual interferometer and sensing interferometer of the VHVE, respectively. Thus, the VHVE-based
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Analysis and research on polarized radiation characteristics of ship targets at sea Opt. Commun. (IF 2.4) Pub Date : 2024-03-04 Junfeng Wang, Xiao Liu, Gang Liu, Maofei Zhu, Chunpeng Zhang, Xueyou Hu
The traditional ship infrared detection method cannot solve the edge details when the ship target interacts flexibly with the sea surface background. Polarization detection technology has gradually become an important research direction for high-precision detection of marine targets because of its advantages of acquiring the intrinsic characteristics of targets. This paper selects the typical part
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Diagnosis of multiple gases using a multi-pass ring cavity to enhance Raman scattering Opt. Commun. (IF 2.4) Pub Date : 2024-03-04 Ke Wang, Zhenrong Zhang, Zhenjie Wu, Sheng Wang, Guohua Li, Jun Shao, Haolong Wu, Mengmeng Tao, Jingfeng Ye
Spontaneous Raman scattering is widely used to enable simultaneous concentration measurements of all relevant species with overcomes whose signal is weak and susceptible to fluorescence interference. A multi-pass ring-cavity scheme is proposed to enhance Raman scattering signal. The Raman spectra of CO, N, O and HO in the air are acquired under condition of low excitation power which is 200 mW laser
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Metallic waveguide transmitarrays for dual-band terahertz antennas with high gain and low sidelobe levels Opt. Commun. (IF 2.4) Pub Date : 2024-03-03 Ning Wang, Tao Peng, Junkun Huang, Min Zhang, Hong Su, Ling Li, Huawei Liang
The antenna is an indispensable device in terahertz (THz) wireless communication systems. Owing to the high propagation attenuation of THz waves in atmospheric, THz antennas with high gain and low sidelobe levels (SLLs) are in an urgent need. Here, a metal waveguide transmitarry antenna (MWTA) is proposed to realize high gain and low SLLs at dual THz bands simultaneously. At the frequencies of 0.14
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All-optical, filter-free, image-reject, and fundamental/sub-harmonic downconverted RoF link Opt. Commun. (IF 2.4) Pub Date : 2024-03-01 Dongjuan Shan, Yuanyuan Li, Wu Zhang
An all-optical, image-reject, and fundamental/sub-harmonic downconverted radio-over-fiber (RoF) link using a polarization-division multiplexing Mach–Zehnder modulator (PDM-MZM) and fiber-dispersion effect is proposed. At the remote antenna unit, the receiving radio frequency (RF) signal and the local oscillator (LO) signal are used to drive two sub-MZMs of the PDM-MZM. After a length of optical fiber
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Widely and fast tunable external cavity laser on the thin film lithium niobate platform Opt. Commun. (IF 2.4) Pub Date : 2024-03-01 Yekai Ren, Bo Xiong, Yalong Yu, Kangping Lou, Tao Chu
We develop an integrated external cavity laser with a broad wavelength tuning range and a fast switching speed on thin film lithium niobate (TFLN) platform. By butt coupling an InP-based optical gain chip with a TFLN external cavity chip, a hybrid lithium niobate/III-V tunable laser with a wavelength switching speed of 18 ns is achieved. Furthermore, using a cascaded external cavity filter composed
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A self-rotating quasi-non-diffracting beam inspired by a general phase transfer function Opt. Commun. (IF 2.4) Pub Date : 2024-02-28 Liangying Han, Yueqiang Zhu, Jianyong Zhang, Kaige Wang, Wei Zhao
The generation of non-diffracting beams often requires solving complex partial differential equations, e.g., Maxwell's equations or Schrödinger equation. This poses a significant challenge when it comes to developing new types of non-diffracting beams. In this study, we propose a general phase transfer function that can be used with a spatial light modulator (SLM) in a high numerical aperture (NA)
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A metasurface-on-fiber light-sheet generator for biological imaging Opt. Commun. (IF 2.4) Pub Date : 2024-02-28 Chunshu Li, Yuhao Guo, Xingzhao Chang, Yongjun Guo, Mengxia He, Lin Zhang
Light sheet has been widely used for bioimaging. However, it is a big challenge to build a miniature light-sheet imaging system due to geometric constraints of bulky refractive and diffractive elements. Metasurface-based devices composed of subwavelength unit cells, with compact size and the ability to effectively manipulate optical fields, have been considered as potential planar analogs of conventional
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Performance improvement of InGaN/GaN light-emitting diodes using parabolic quantum well Opt. Commun. (IF 2.4) Pub Date : 2024-02-28 Apu Mistry, Joyeeta Basu Pal, Himanshu Karan
The effect of optical performance for light-emitting diodes (LEDs) using InGaN/GaN parabolic quantum well (PQW) has been studied in terms of transition probability (TP) and internal quantum efficiency. The performance analyses on the light of energy band structure, carrier concentration profile, electric field distribution and radiative recombination rate. Introduction of parabolic QW (PQW) decreases
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Wavelength division multiplexing visible light communication with wide incident angle enabled by perovskite quantum dots Opt. Commun. (IF 2.4) Pub Date : 2024-02-28 Yuxuan Fu, Li Zhang, Yuanhang Wangzhou, Shujun Zheng, Yuhan Sun, Jun Liu, Yuhang Zhang, Siqi Li, Zhijia Hu, Benli Yu, Zhigang Cao, Chao Li
In this paper, a wavelength division multiplexing (WDM) visible light communication (VLC) system based on the perovskite quantum dots (QDs) with two different fluorescence wavelengths is demonstrated. This system consists of a transmitter, free space channel and a receiver. The NRZ-OOK (non-return-zero on-off-keying) signals are transmitted in this channel to achieve WDM visible light communication
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Polarization properties of the Laser-Induced Plasma Lasers generating according to the quasi-three-level scheme Opt. Commun. (IF 2.4) Pub Date : 2024-02-28 L, ., , N, a, g, l, i
Systematic studies have been conducted on the polarization characteristics of Laser-Induced Plasma Lasers (LIPL) that utilize the quasi-three-level generation scheme. The Degree of Polarization for generation lines is found to alter its sign with a change in the total angular momentum by one, either for the level from which pumping begins or for the lower generation level. While this behavior echoes
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Design of all-fiber 2D MMI based optical devices using 1D mode propagation method Opt. Commun. (IF 2.4) Pub Date : 2024-02-27 Kritarth Srivastava, Nitin Bhatia
We show that the mode propagation analysis in a 2D confined optical device can be bifurcated into two 1D problems. In our method, a given 2D launch field profile is divided into two 1D profiles and suitably aligned with the 1D waveguide, acting as independent launching conditions. This method shows that the complete propagation problem of a 2D waveguide, which involves the computation of 2D mode field
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Orbital angular momentum holographic encryption based on position multiplexing and frequency shift Opt. Commun. (IF 2.4) Pub Date : 2024-02-27 Hao Yuan, Sixing Xi, Nana Yu, Qiaofen Zhu, Songxiao Liu, Xiangxiang Ji, Xiaolei Wang, Liying Lang, Zhuqing Zhu
A large-capacity, large-size image information encryption technique based on orbital angular momentum (OAM) holography and optical multiplexing is proposed. Large-size images undergo non-equal segmentation using frequency-shifted phase, followed by sampling and the sampling interval is determined by the spatial frequency of the spiral phase plates with different topological charges. These sampled sub-images
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Simulation of Gb/s free space optical secure communication using interband cascade laser chaos Opt. Commun. (IF 2.4) Pub Date : 2024-02-26 Hong Han, Jiada Xu, Xumin Cheng, Zhiwei Jia, Jianguo Zhang, K. Alan Shore
We theoretically explore Gb/s message encryption in free space communications exploiting synchronized mid-infrared chaos from unidirectionally coupled interband cascade lasers (ICLs) with optical feedback. The achievable message encryption rate depends on the chaos bandwidth and relaxation frequency oscillation of the ICL which in turn, are determined by the bias current and the number of stages of
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Performance stability of porous silicon solar cells using reduced graphene oxide for applications in harsh environments Opt. Commun. (IF 2.4) Pub Date : 2024-02-25 Nima Naderi, Harith Ahmad
The impact of graphene on the photovoltaic stability of solar cells made of porous silicon (PSi) is discussed in this research. Here, reduced graphene oxide (rGO) capping layers electrophoretically deposited on PSi substrates were used to regulate the photoluminescence (PL) quenching of the PSi substrates. The samples' morphology showed that after graphene transfer, the porosity structure remained
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Electrically tunable dual-channel absorber based on a graphene integrated slanted grating cavity Opt. Commun. (IF 2.4) Pub Date : 2024-02-24 Yun Qiu, Xin Zhang, Kangni Wang, Lin Yong Qian
In this paper, we propose a tunable dual-channel absorber based on a monolayer of graphene combined with a slanted grating. A single-channel perfect absorption of a monolayer graphene structure at 850 nm was initially achieved in a Fabry-Perot cavity resonance. The absorption rate of graphene was enhanced by nearly 24.5 times. Furthermore, the symmetry of the grating is broken to excite the quasi-bound
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Analytic pointing error evaluation on nano-satellite laser communication system Opt. Commun. (IF 2.4) Pub Date : 2024-02-24 Kiwook Baeck, Junsung Wi, Hyosang Yoon
This study uses comprehensive pointing control analysis to calculate laser pointing errors for nano-satellite laser communication systems. This methodology especially enables the performance evaluation of the pointing system during the satellite pointing budget design phase. The analysis consists of a two-stage pointing approach: a body pointing stage of a satellite and a fine pointing stage within
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Amplitude variations caused by fiber nonlinearity in photonics-assisted microwave signal replication Opt. Commun. (IF 2.4) Pub Date : 2024-02-23 Yifan Pu, Xiuyuan Sun, Zhongyang Xu, Shilong Pan
—Photonics-assisted microwave signal replication based on fiber-recirculating loops has been applied to microwave detection and processing. But, in the fiber recirculating loops, optical signals are significantly influenced by the nonlinear optical effects. In this paper, we analyze the amplitude variations of the replicated microwave signals that are caused by fiber nonlinearity. Numeric simulations
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Design and simulation numerically with performance enhancement of extremely efficient Sb2Se3-Based solar cell with V2O5 as the hole transport layer, using SCAPS-1D simulation program Opt. Commun. (IF 2.4) Pub Date : 2024-02-22 Md. Forhad Hossain, Avijit Ghosh, Mohd Abdullah Al Mamun, Asif Ahammad Miazee, Hamad Al-lohedan, R. Jothi Ramalingam, Mohammad Fokhrul Islam Buian, Syed Riazul Islam Karim, Md. Yousup Ali, M. Sundararajan
Antimony Tri-selenide (SbSe), a readily available, non-toxic chemical has the capability to be utilized as a solar cell substance. In the current work, basic equations such Poisson's, drift-diffusion, and carrier continuity are used to quantitatively study SbSe solar cells using the Solar Cell Capacitance Simulator (SCAPS-1D) program. The key intent of this project is to enhance the performance of
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Controlling the polarization structure of vector beams synthesized by a fiber laser array Opt. Commun. (IF 2.4) Pub Date : 2024-02-22 E.V. Adamov, E.A. Bogach, V.V. Dudorov, V.V. Kolosov, M.E. Levitskii
In our earlier paper [Adamov, E. V., Aksenov, V. P., Dudorov, V. V., Kolosov, V. V., & Levitskii, M. E. (2022). Controlling the spatial structure of vector beams synthesized by a fiber laser array. , , 108,351], we presented the method to control the spatial intensity distribution of a beam synthesized as a result of coherent combining of subbeams from an array of phase-controlled fiber radiation sources
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Eight-channel integrated device for electro-optic modulation and dense wavelength division multiplexing based on photonic crystals Opt. Commun. (IF 2.4) Pub Date : 2024-02-22 Yuchen Hu, Heming Chen
We propose an eight-channel integrated device for electro-optic modulation and dense wavelength division multiplexing based on photonic crystals. The device consists of eight photonic crystal AAH cavities and eight reflection cavity filters to contribute a modulation module and a dense wavelength division multiplexing module, respectively. First, the physical model of the eight-channel integrated device
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Strong circular dichroism absorbers using chiral metamaterials with circular polarization Opt. Commun. (IF 2.4) Pub Date : 2024-02-22 Hongyan Yang, Hongrui Sun, Yuhang Yang, Quanlin He, Xiao Gongli, Bing Wang, Liyang Shao
We designed and characterized a chiral metamaterial circularly polarized strong circular dichroism absorber with dynamic tuning capabilities using graphene. The synergistic combination of strong circular dichroism and perfect absorption, coupled with the tunability afforded by graphene, positions this absorber as a promising candidate for advanced electromagnetic applications. Employing a frequency-domain
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Three-dimensional sound source localization system based on fiber optic sensor array with an adaptive algorithm Opt. Commun. (IF 2.4) Pub Date : 2024-02-21 Xiaoqiang Li, Chenggang Guan, Haixin Qin, Junchang Huang, Wenxiu Chu, Shiyi Chai, Puchu Lv, Shasha Li, Yala Tong
Sound Source Localization (SSL) based on microphone arrays nowadays is widely used in the fields of machinery rattle localization, weapon navigation, and robot hearing. However, there is also a need for SSL in some special environments, such as long-distance gas pipelines where there is a risk of leakage. In these environments, arrays built with ordinary microphones can be a safety hazard, which can
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Narrow-linewidth stable-spectrum diode laser source basing on polarization-separated external cavity feedback technology Opt. Commun. (IF 2.4) Pub Date : 2024-02-21 Jinliang Han, Xiaonan Shan, Yawei Zhang, Hangyu Peng, Jiye Zhang, Lijun Wang, Jun Zhang
In this study, we propose a polarization-separated external cavity feedback structure based on a volume Bragg grating (VBG) that folds the optical path of a free-running diode laser into a non-straight direction for linewidth narrowing and central wavelength locking. By employing diode laser polarization splitting technology and external cavity feedback technology, a similar output power and narrow
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Frequency response of the non-polarization-maintaining depolarized sagnac interferometer based on maximum fringe contrast Opt. Commun. (IF 2.4) Pub Date : 2024-02-21 Mingchen Zhang, Zhuyuan Huang, Zhigang Cai, Fujuan Wang, Jiahui Wang, Jiaoyang Li, Zixin Wang
The Sagnac Interferometer offers a promising solution to the speckle problem in interferometric detection due to its insensitivity to environmental low-frequency interference, making it well-suited for applications such as laser ultrasonic detection. Control of the polarization state of light is imperative for achieving high sensitivity in optical fiber interferometer and ensuring optimal quiescent
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Improved detection of particle displacement in optical traps using back focal plane interferometry and image processing Opt. Commun. (IF 2.4) Pub Date : 2024-02-21 Jiangtao Li, Dadi Xu, Liu Liu, Hongwu Tang
Optical tweezers play a crucial role in particle manipulation and force measurement. Therefore, it is essential to calibrate the force measurement parameters, such as the optical trap stiffness and the conversion factor of the sensor deflection signal to the actual displacement of the trapped particle. This calibration is necessary to achieve accurate and efficient parameter calibration. In this study
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Tunable flat-top filter with cascaded compound gratings based on lithium niobate assisted by quasi-bound states in the continuum Opt. Commun. (IF 2.4) Pub Date : 2024-02-21 Lili Sun, Jinhua Hu, Lei Li, Xiuhong Liu, Jijun Zhao
We propose a tunable filter with cascaded compound gratings based on lithium niobate (LN). Herein, the reflectivity spectrum with a narrow-band and flat-top line shape can be obtained by using the quasi-bound states in the continuum (quasi-BICs) and selecting the appropriate grating offset. Simultaneously, we apply a voltage on LN to modulate the refractive index to achieve wavelength tunability. The
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High-efficiency terahertz wavefront manipulation based on optimized catenary metasurface Opt. Commun. (IF 2.4) Pub Date : 2024-02-20 Ming Zhang, Yiwen Wu, Peng Dong, Baozhu Wang, Lin Yang, Yan Shang
Catenary optics, as a new development object in the field of subwavelength optics, has been paid close attention and studied by scientists since it was proposed. As a two-dimensional planar structure, metasurface can realize the free control of electromagnetic wave in space. Traditional metasurface structures are often designed with discrete unit structures, which process is complicated and prone to
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Independently tunable dual Fano resonances based on plasmonic MIM Sagnac loop coupling Taiji resonator Opt. Commun. (IF 2.4) Pub Date : 2024-02-20 Huibo Fan, Hongkun Guo, Huili Fan
In this paper, we first propose and demonstrate independently tunable dual Fano resonances based on a plasmonic structure composed of MIM (metal-insulator-metal) Sagnac loop with embedded Taiji resonator. An S-shaped crossover branch inside the Taiji ring resonator can tailor the propagating modes into their counter-propagating directions, finally tuning the number of whispering-gallery modes (WGMs)
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Gabor-type holography solved analytically for complex-valued phase disks Opt. Commun. (IF 2.4) Pub Date : 2024-02-20 Jesper Glückstad, Andreas Erik Gejl Madsen
Solving the holography equation has long been a numerical task. While effective, the numeric approach has its own set of limitations. Relying solely on numerical approaches often obscures the intricate interplay and influence of the individual terms within the equation. This not only hampers a deeper understanding of the underlying physics but also makes it challenging to predict or control specific
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Two-frame wavefront reconstruction method with nonlinear optimization for Ronchi lateral shearing interferometry Opt. Commun. (IF 2.4) Pub Date : 2024-02-20 Runzhou Shi, Huiwen Liu, Yuqi Shao, Tian Zhang, Jian Bai
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Switchable large-angle beam splitter based on a continuous metasurface in the near-infrared region Opt. Commun. (IF 2.4) Pub Date : 2024-02-20 Junyao Chen, Haonan Qi, Ruiya Liu, Bin Tang
Metasurface-based beam splitters with broadband and high efficiency are highly desirable in various optical and photonic applications. In this paper, we theoretically propose a switchable equal power beam splitter with large beam splitting angle based on a continuous metasurface by integrating the vanadium dioxide (VO). Utilizing the phase change characteristics of VO, the beam splitter can be thermally
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High-repetition-rate, 1011.5–1091.6 nm consecutively tunable mode-locked picosecond Yb: Fiber laser Opt. Commun. (IF 2.4) Pub Date : 2024-02-19 Menglong Ma, Liang Guo, Yun Chen, Shangming Ou, Nan Zhang, Nan Zhao, Jiaming Li, Qingmao Zhang
We demonstrate a widely wavelength tunable high-repetition-rate mode-locked Yb-doped fiber laser, which implements a SESAM mode-locker and a tunable single grating filter. Different tuning approaches are investigated including tuning the mirror and angle of incidence of the filter, as well as changing the pump power. The maximum consecutive tuning range of the laser reaches 80.1 nm, from 1011.5 to
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High fidelity amplification of radially-polarized laser in few-mode polarization-maintaining fiber amplifier Opt. Commun. (IF 2.4) Pub Date : 2024-02-19 Shixin Liu, Wanjing Peng, Zilin Yan, Mingsen Ye, Hang Liu, Yujun Feng, Yinhong Sun, Yi Ma, Zhigang Zhao, Qingsong Gao, Zhaojun Liu, Chun Tang
A high-power 20/400-μm few-mode polarization-maintaining (PM) fiber amplifier with a radially polarized output beam is firstly demonstrated and investigated. The reconstructed beam profiles and mode contents of the output laser were obtained using a numerical method. Experimentally, a home-made fiberized mode convertor was employed to convert the LP mode to be TM mode (radially polarized beam) with
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Design and performance investigation of CIGS/SWCNT tandem solar cell for efficiency improvement Opt. Commun. (IF 2.4) Pub Date : 2024-02-19 Alok Kumar Patel, Rajan Mishra, Sanjay Kumar Soni, Praveen Kumar Rao, Om Mishra
This research work demonstrates the design and simulation of highly efficient tandem solar cell by using SCAPS-1D software. This tandem solar cell has been designed with a higher bandgap Copper Indium Gallium Diselenide (CIGS) absorber as a top cell and a lower bandgap Single Wall Carbon Nano Tube (SWCNT) absorber as a bottom cell, which are arranged in the series connection. Firstly, both top and
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Numerical analysis of cascade lasing in Ho:ZBLAN fiber lasers with efficient output at ∼750 nm Opt. Commun. (IF 2.4) Pub Date : 2024-02-17 Anxin Yu, Peng Wang, Kaiqi Xu, Xindie Chen, Yaolin Fei, Wensong Li
Recent advances in blue-emitting laser diodes (LDs) have enabled visible laser operation in rare-earth-doped fluoride fibers. Therefore, investigation of the power scaling of visible fiber lasers enabled by direct blue diode pumping is significant. In this study, we numerically investigated the performance of a continuous-wave (CW) Ho:ZBLAN fiber laser operating at approximately 750 nm for the F,S→I
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Parity time symmetry all-optical microwave oscillator using a polarization dependent Sagnac loop Opt. Commun. (IF 2.4) Pub Date : 2024-02-17 Guang-Xin Wang, Guang-Fu Bai, Dun-Sheng Shang, Nian Xie, Yue-Gang Chen, Wei-Chao Huang, Yang Jiang
An all-optical microwave oscillator based on parity-time symmetry was proposed and experimentally demonstrated. It mainly consists of a big feedback loop, an active small loop and a polarization-dependent Sagnac loop. The microwave seed signal originates from the beating between the continuous wave and the Stokes wave. The function of microwave envelope detection and feedback modulation are implemented
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Deep-learning-based inverse design of colloidal quantum dots Opt. Commun. (IF 2.4) Pub Date : 2024-02-17 Deokho Jang, Sungchul Kim, Jungho Kim
Because optical properties of colloidal quantum dots (QDs) greatly depend on their layer thicknesses at the sub-nanometer scale, accurately predicting optical properties based on these structural parameters can help streamline the development process. However, most of traditional inverse design approaches require time-consuming numerical simulations and optimization processes. In this simulation-only
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Fast earthquake recognition method based on DAS and one dimensional QRE-net Opt. Commun. (IF 2.4) Pub Date : 2024-02-15 Yage Zhan, Wenzhuo Zhang, Zhaoyong Wang, Junqi Yang, Kehan Li, Lirui Liu, Qing Ye
Earthquake early warning can provide important information before the occurrence of destructive disasters to reduce the possible loss, and the requirements for earthquake identification time and accuracy are strict. As a new seismic monitoring technology, distributed optical fiber acoustic sensing (DAS) has the advantages of wide coverage and spatially dense detection. DAS can be deployed in earthquake-prone
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Diverse dispersion states achieving in phase change material metalenses Opt. Commun. (IF 2.4) Pub Date : 2024-02-15 Yuhan Hong, Zhongchao Wei
Dispersion is a critical phenomenon that underlies the frequency-dependence of light propagation in a medium, and it plays an essential role in various optical systems such as communication, imaging, and sensing. Different dispersion states exhibit specific applications such as achromatic imaging and hyper-dispersive spectroscopy. Despite much recent work on metalenses-based dispersion-related devices