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Imaging through a multimode optical fiber with principal component analysis and a variational autoencoder J. Opt. (IF 2.1) Pub Date : 2024-02-27 Shichao Yue, Zifan Che, Minzhi Xu
Imaging through the multi-mode fiber (MMF) becomes an attractive approach for gaining visual access to confined spaces. However, current imaging techniques through a MMF still encounter challenges including modal dispersion, complex wave-front shaping mechanism, and expensive light sources and modulations. This work proposed a cost-efficient setup with three light-emitting diodes as the illumination
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Ultra-compact and low-insertion-loss silicon modal bandpass filter using a pixelated region J. Opt. (IF 2.1) Pub Date : 2024-02-27 Yun Chen, Yuxiao Liu, Pengjun Wang, Qiang Fu, Weiwei Chen, Shixun Dai, Jian Lin, Haoqi Chen, Jun Li, Tingge Dai, Jianyi Yang
In this paper, a silicon modal bandpass filter using a pixelated region, in which the TE1 mode passes through while TE0 and TE2 modes are blocked, is proposed, optimized, and experimentally demonstrated. To achieve low insertion loss, ultra-compact footprint, relatively broad bandwidth and large extinction ratio, the direct-binary-search optimization algorithm and finite difference time domain method
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Complex far fields and optical singularities due to propagation beyond tight focusing: combined effects of wavefront curvature and aperture diffraction J. Opt. (IF 2.1) Pub Date : 2024-02-27 Nitish Kumar, Anirban Debnath, Nirmal K Viswanathan
All optical systems, which involve the collimation of a reflected, transmitted or scattered wave subsequent to tight focusing, are subject to two kinds of deviations. One is the wavefront curvature due to inaccurate focal placement of the interface or scatterer particle under consideration, and the other is the diffraction caused by the finite lens aperture. In the present paper we explore these phenomena
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Effect of electron–phonon interactions on a three-level QD-based spaser: linear and quadratic potentials J. Opt. (IF 2.1) Pub Date : 2024-02-27 Ankit Purohit, Vishvendra Singh Poonia, Akhilesh Kumar Mishra
In this article, we study the effect of electron–phonon interaction on a spaser (surface plasmon amplification by stimulated emission of radiation) system consisting of a metal nanoparticle surrounded by a large number of quantum dots (QDs). Usually, the effect of electron–phonon interaction is neglected in the spaser-related literature. However, gain media, in this case QDs, attributed by the large
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Improving orbital angular momentum mode transmission with imperfect ring–core fiber J. Opt. (IF 2.1) Pub Date : 2024-02-23 Xiaohui Wang, Yongze Yu, Dongdong Deng, Shuai Mao, Yang Wang, Haoyu Gu, Yingxiong Song, Fufei Pang, Liyun Zhuang, Song Yang, Xiaofeng He, Chao Wang, Tiezhu Zhu, Yudong Yang
Orbital angular momentum (OAM), inherent to light beams characterized by helical phase fronts, represents an alternative spatial degree of freedom for photons. In recent years, OAM-based communication has gained significant attention as a potential solution to increase the capacity and spectral efficiency of optical fiber communication systems. In optical fibers, OAM modes can be generated and manipulated
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Wavefront reconstruction based on ASH-Net with less lenslets SHWFS J. Opt. (IF 2.1) Pub Date : 2024-02-22 Hongyan Wang, Qi Zhang, Ming Hu, Xingyu Xu, Jingjing Wu, Lifa Hu
Generally, the number of lenslets in Shack–Hartman wavefront sensor (SHWFS) determines its spatial sampling frequency. However, increasing the number of lenslets is limited by the data processing delay time and low sensitivity in the adaptive optics system. In this paper, a wavefront reconstruction method based on ASH-Net for SHWFS is presented to recover the distorted wavefront from the light spots
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Generation of a super-oscillation magnetization hotspot by reversing the electric dipole array radiation J. Opt. (IF 2.1) Pub Date : 2024-02-22 Ruimin Xiao, Junyi Xiong, Zhiyuan Wang, Jia Zhou, Guohong Dai, Mengqiang Cai, Weichao Yan
We propose an all-optical approach to realize a super-oscillatory longitudinal magnetization hotspot with about 0.1λ in a 4π focusing system using time-reversed dipole radiation and vector diffraction theory calculations. Such a magnetization behavior is induced by focal fields of opposite polarities in the central and peripheral regions based on the inverse Faraday effect. By regulating the destructive
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Bandgap engineering and amplification in photonic time crystals J. Opt. (IF 2.1) Pub Date : 2024-02-22 Snehashis Sadhukhan, Somnath Ghosh
Recently, there has been a growing interest in time-varying photonic media owing to their significant potential in the field of wave manipulation. Here, we explore the exotic characteristics of wave amplification in a photonic time crystal (PTC) made of a spatially homogeneous medium where the refractive index varies periodically in time. Based on qualitative and quantitative analysis of the amplification
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Revisiting anapoles in a single high-index dielectric structure J. Opt. (IF 2.1) Pub Date : 2024-02-22 Longxiao Wang, Lujun Huang
High-index dielectric structures support electric and magnetic Mie resonance. Through careful manipulation of geometric parameters, destructive interference can be induced between electric multipole moments and toroidal multipole moments. This leads to the formation of anapoles, which are characterized by quenched scattering in the far field and giant enhancement in the near field. Here, we revisit
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Polarization-based all-optical logic gates using diffractive neural networks J. Opt. (IF 2.1) Pub Date : 2024-02-19 Xiaohong Lin, Kou Zhang, Kun Liao, Haiqi Huang, Yulan Fu, Xinping Zhang, Shuai Feng, Xiaoyong Hu
Optical logic operations are an essential part of optical computing. The inherent stability and low susceptibility of polarization to the external environment make it a suitable choice for acting as the logical state in computational tasks. Traditional polarization-based optical logic devices often rely on complex cascading structures to implement multiple logic gates. In this work, by leveraging the
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Optimizing the temporal and spatial resolutions and light throughput of Fresnel incoherent correlation holography in the framework of coded aperture imaging J. Opt. (IF 2.1) Pub Date : 2024-02-14 Francis Gracy Arockiaraj, Agnes Pristy Ignatius Xavier, Shivasubramanian Gopinath, Aravind Simon John Francis Rajeswary, Saulius Juodkazis, Vijayakumar Anand
Fresnel incoherent correlation holography (FINCH) is a well-established digital holography technique for 3D imaging of objects illuminated by spatially incoherent light. FINCH has a higher lateral resolution of 1.5 times that of direct imaging systems with the same numerical aperture. However, the other imaging characteristics of FINCH, such as axial resolution, temporal resolution, light throughput
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Infrared plasmonic refractive index sensor utilizing 2D grating of nano-bowtie particles for both gas and liquid J. Opt. (IF 2.1) Pub Date : 2024-02-14 Xiangxian Wang, Xijun Rao, Jiankai Zhu, Yizhen Chen, Yunping Qi, Chaojun Tang, Hua Yang
We propose a plasmonic structure that can be used for refractive index sensing with different analytes in the same wavelength-domain. A two-dimensional (2D) grating composed of nano-bowtie particles is used as the optical momentum coupling structure. The double-period feature of the 2D grating makes the structure have two excitation approaches with different polarization directions of incident light
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Terahertz bi-functional polarization converter based on interference mechanism supported by diatomic metasurfaces J. Opt. (IF 2.1) Pub Date : 2024-02-08 Hui Li, Wenhui Xu, Hang Xu, Chunyu Song, Qi Tan, Jianquan Yao
Polarization manipulation based on the Jones matrix facilitates the enhancement of light-matter interactions. Recently, arbitrarily tailorable polarization states generated with the assistance of a diatomic metasurface effectively reduce the complexity of the system. Nevertheless, a single polarization switching behavior hinders the application of meta-platforms in cryptographic imaging. Here, we theoretically
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Fourier-transform-only method for random phase shifting interferometry J. Opt. (IF 2.1) Pub Date : 2024-02-08 Alperen Saltik, Sueda Saylan, Onur Tokel
An accurate and computationally simple phase shifting interferometry (PSI) method is developed to reconstruct phase maps without a priori knowledge of the phase shift. Previous methods developed for random PSI either do not address general sources of error or require complex iterative processes and increased computational time. Here we demonstrate a novel method that is able to extract the phase using
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Large and active circular dichroism in a photosensitive silicon based metasurface J. Opt. (IF 2.1) Pub Date : 2024-02-07 Wenchang Zhu, Huan Jiang, Songliang Zhao, Hui Zhang, Weiren Zhao
Active circular dichroism (CD) is highly required for flexible polarization control in modern terahertz (THz) systems. In this work, we numerically achieve large and active CD in THz region by optically controlling photosensitive silicon in a gold/silicon hybrid cross-shape metasurface. At the incident angle of 75°, the proposed metasurface exhibits large CD. By tuning the conductivity of photosensitive
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Light switching between localized and delocalized states in chiral moiré-like photonic lattice J. Opt. (IF 2.1) Pub Date : 2024-02-05 Yundong He, Zhixi Wen, Zhenzhu Tong, Jiahao Guan, Guoguo Xin, Wenjing Zhang, Yuanmei Gao, Xinyuan Qi
We constructed a chiral moiré-like lattice pattern by the interference between two sets of plane waves and two circular polarized beams. The study shows that the intensity distributions of the lattice pattern are a moiré-like structure in the transverse direction and a spiral structure in the longitudinal direction. By tuning the relative rotation angle between two sets of beams, moiré-like lattice
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A comparative study of coherent and incoherent drives in a four-level quantum dot–based spaser J. Opt. (IF 2.1) Pub Date : 2024-02-05 Ankit Purohit, Akhilesh Kumar Mishra
In this article, we theoretically investigate a spaser (surface plasmon amplification by stimulated emission of radiation) comprising a spherical silver nanoparticle surrounded by a four-level gain medium of quantum dots. The spaser system is pumped coherently and incoherently with the same excitation rate, and the characteristics of the resultant coherent localized surface plasmon (LSP) mode are compared
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Non-iterative generation of binary amplitude holograms applied to holographic projection with digital micromirror devices J. Opt. (IF 2.1) Pub Date : 2024-02-02 César Antonio Hoyos-Peláez, Alejandro Velez-Zea, John Fredy Barrera-Ramírez
In this work, we implement a fast non-iterative method for the generation of binary amplitude Fresnel holograms and demonstrate their application in a holographic projection scheme based on a digital micromirror device. To achieve this, we perform the binarization of phase-only holograms generated using an optimized Fresnel random phase. We analyze the quality of the resulting binary amplitude holograms
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Development and comparison of primary facilities for traceable BSSRDF measurements J. Opt. (IF 2.1) Pub Date : 2024-02-02 Pablo Santafé-Gabarda, Lou Gevaux, Alejandro Ferrero, Tommaso Fontanot, Jan Audenaert, Youri Meuret, Gaël Obein, Joaquín Campos
The bidirectional scattering-surface reflectance distribution function (BSSRDF) describes the radiance originated by the volume scattering and the surface reflectance of any position on the surface of a sample, when it is directionally irradiated at any other position. The present state of the technology for appearance rendering requires a more detailed physical description of translucent objects by
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Enhancement in the magneto-optical effect induced by combining multiple modes in a gold film–supported hybrid periodic gold/magnetic nanorod array J. Opt. (IF 2.1) Pub Date : 2024-02-01 Guoqiang Du, Wenshuo Zhang, Zhifeng Liu, Na Liu, Lin Zhang, Kang An, Weiwei Zhang
In this study, the possibility of enhanced transverse magneto-optical Kerr effect (TMOKE) and performance monitoring of a hybrid nanostructure developed by sandwiching a ferromagnetic film within a gold layer and square periodic nanorod arrays, is theoretically investigated. Based on the findings, the TMOKE signal can be enhanced approximately 33 times when compared to the referenced planar film, which
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Ultrabroadband vernier cascaded microring filters based on dispersive Si3N4 waveguides J. Opt. (IF 2.1) Pub Date : 2024-02-01 Tong Lin, Fengsheng Lu, Pinchen Zhou, Yizhao Chen, Jianwei Jiang, Guohua Hu, Binfeng Yun, Yiping Cui
A viable candidate for use in silicon photonics and microwave photonics is the hybrid external cavity laser (ECL) chip, which offers a high extinction ratio, ultrabroadband mode-hopping-free tuning range, and small linewidth. It requires a photonic filter device with an ultrabroadband operating bandwidth and adjustable frequency selection capability. The Vernier cascaded microring filter is a prevailing
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Simultaneous mapping of the magnetic field components using near-field microscopy J. Opt. (IF 2.1) Pub Date : 2024-02-01 Juan M Merlo, Raphael J Ettinger-Finley, Madeleine Hoag Carhart, Florence Binny, Lázaro Merlo-Ramírez
In this work, we present a near-field scanning optical microscope capable of simultaneously mapping the x− , y− , and z− components of the magnetic field generated by a set of magnetic coils in the kHz range. Using this device, we present two experiments: the observation of the well-known magnetic field of a circular coil and a resolution test. The observations achieved with our instrument are supported
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Impact of propagation losses on photon-pair generation in silicon J. Opt. (IF 2.1) Pub Date : 2024-01-12 Shivani Sharma, Joyee Ghosh, Vivek Venkataraman
We present a semi-classical numerical model to estimate the impact of linear scattering loss and nonlinear absorption losses on the biphoton flux and their quantum correlations generated via spontaneous four-wave mixing in silicon nanowaveguides. The counter-intuitive observed enhancement of pair correlations with increasing loss is attributed to the dominant effect of reduced accidental counts from
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Multifunctional optical logic device based on nanoscale rectangular ring resonator J. Opt. (IF 2.1) Pub Date : 2023-12-29 Junxiong Chai, Yiyuan Xie, Jing Tan, Xiao Jiang, Yan Chen
Integrated optical logic devices are essential building blocks for implementing all-optical arithmetic and logic unit. In this paper, an ultra-compact multifunctional optical logic device consisting of a rectangular ring resonator coupled with two parallel metal–insulator–metal waveguides is presented. The transmission characteristics of the structure are analyzed in detail via temporal coupled-mode
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Separation and detection of orbital angular momentum states of composite vortex beams in atmospheric turbulence channels J. Opt. (IF 2.1) Pub Date : 2023-12-28 Wei Hongyan, Zhou Han, Fu Yuejiao, Du Qianqian, Jia Peng, Cai Dongmei
The separation and detection of compound orbital angular momentum (OAM) modes are the basis for achieving high-speed and high-capacity communication, but the atmospheric turbulence causes distortion of the phase fronts of vortex beams, which hinders the recognition of OAM modes. To solve this problem, in this work, we propose and investigate a joint scheme of combining the Gerchberg–Saxton (GS) algorithm
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The conditions for the analog of QED photons in semi-classical periodically driven systems J. Opt. (IF 2.1) Pub Date : 2023-12-27 Nimrod Moiseyev, Matan Even Tzur
The Floquet and quantum electrodynamics (QED) Hamiltonians are widely used in various contexts for light-matter interactions. While they exhibit structural similarity, the QED Hamiltonian has a bounded spectrum while the Floquet Hamiltonian does not. Thus, it remains uncertain if they share the same or similar spectra, even at high energy with a substantial average photon count. Using the Gershgorin
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Fast and high precision phase recovery technology of single-shot ineterferogram based on depth convolution neural network J. Opt. (IF 2.1) Pub Date : 2023-12-22 Yu Kuang, Jiawen Li, Fengwei Liu, Yongqian Wu, Rongzhu Zhang
Phase retrieval from single interferogram is of great interest for the possibility of dynamic phase measurement. However, it is a very complicated process in reality since the unknowns and knows are highly unequal. In this paper, we propose a fast phase recovery method from single interferogram based on deep convolution neural network. The network is trained based on supervised learning to achieve
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Optimized design of nano-photonic devices for temperature self-regulating on vanadium dioxide thin films J. Opt. (IF 2.1) Pub Date : 2023-12-21 Sen Lin, Binhe Wu, Chunrui Wang, Jian Zhou, Hao Sun, Wenhan Cao
Phase change materials can enable temperature self-regulation due to their drastic changes in optical properties accompanying the phase transition. Significant reduction of the optical absorption after the transition is the key ingredient for an enhanced regulating performance. However, the absorptivity of unpatterned vanadium dioxide (VO2) thin films can hardly be reduced after phase transition at
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High-speed physical layer secure communication scheme based on synchronous chaotic and electro-optic self-feedback dual-phase encryption J. Opt. (IF 2.1) Pub Date : 2023-12-21 Wenfu Gu, Xulin Gao
In this paper, a novel secure communication scheme based on temporal spreading and dual-phase perturbation is proposed to improve security at the physical layer. For one thing, the traditional electro-optical feedback phase encryption system is significantly sophisticated by the introduction of additional synchronized chaotic phase encryption. Besides, more keys in this system are available, with the
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Measurement of irregular particle size from the reconstructed shape images J. Opt. (IF 2.1) Pub Date : 2023-12-20 Jinlu Sun, Yue Qiu, Cheng Zhang, Yuhang Wu, Yuqiang Li, Changyun Miao
A method for measuring the size of irregular particles is proposed. The smallest bounding rectangular box of the particle image can be acquired after obtaining interferometric out-of-focus image by using interferometric particle imaging technology and reconstructing particle shape through convolutional neural network. The number of image pixels of the particle can be obtained from the smallest bounding
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Roadmap on optical sensors J. Opt. (IF 2.1) Pub Date : 2023-12-18 Mário F S Ferreira, Gilberto Brambilla, Luc Thévenaz, Xian Feng, Lei Zhang, Misha Sumetsky, Callum Jones, Srikanth Pedireddy, Frank Vollmer, Peter D Dragic, Ori Henderson-Sapir, David J Ottaway, Elodie Strupiechonski, Goretti G Hernandez-Cardoso, Arturo I Hernandez-Serrano, Francisco J González, Enrique Castro Camus, Alexis Méndez, Paola Saccomandi, Qimin Quan, Zhongcong Xie, Björn M Reinhard, Max
Optical sensors and sensing technologies are playing a more and more important role in our modern world. From micro-probes to large devices used in such diverse areas like medical diagnosis, defence, monitoring of industrial and environmental conditions, optics can be used in a variety of ways to achieve compact, low cost, stand-off sensing with extreme sensitivity and selectivity. Actually, the challenges
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Beam displacement tolerances on a segmented mirror for higher-order Hermite–Gauss modes J. Opt. (IF 2.1) Pub Date : 2023-12-14 Liu Tao, Nina Brown, Paul Fulda
Odd-indexed higher-order Hermite–Gauss (HG) modes are compatible with four-quadrant segmented mirrors due to their intensity nulls along the principal axes, which guarantees minimum beam intensity illuminating the bond lines between the segments thus leading to low power loss. However, a misplaced HG beam can cause extra power loss due to the bright intensity spots probing the bond lines. This paper
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Adjustable accuracy of phase steps in a double-aperture common-path interferometer by rotating and displacing grating at Fourier plane J. Opt. (IF 2.1) Pub Date : 2023-12-08 Marymar Castillo-Luna, Cruz Meneses-Fabian
Detuning errors limit the accuracy of phase extraction in phase-shifting interferometry (PSI). To improve this accuracy, the systems to control the phase shifter dispositive must be highly accurate, involving high technology, exhaustive calibration, high cost, and constant maintenance. This manuscript presents a method for improving the accuracy of the phase step generated at the Fourier plane by rotating
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Real time characterization of atmospheric turbulence using speckle texture J. Opt. (IF 2.1) Pub Date : 2023-12-06 Priyanka Lochab, Basant Kumar, D P Ghai, P Senthilkumaran, Kedar Khare
A new method is proposed for the characterization of the atmospheric turbulence strength parameter ( Cn2 ) based on the principal component analysis (PCA) of the texture of the speckle intensity pattern obtained on long-range propagation of a focused charge +1 vortex beam. Employing the split-step propagation method, datasets containing instantaneous intensity images of the focused vortex beam are
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Violation of Bell’s inequality for helical Mathieu–Gauss vector modes J. Opt. (IF 2.1) Pub Date : 2023-12-06 Edgar Medina-Segura, Francisco I Mecillas-Hernández, Thomas Konrad, Carmelo Rosales-Guzmán, Benjamin Perez-Garcia
Vector beams display varying polarisation over planes transversal to their direction of propagation. The variation of polarisation implies that the electric field cannot be expressed as a product of a spatial mode and its polarisation. This non-separability has been analysed for particular vector beams in terms of non–quantum entanglement between the spatial and the polarisation-degrees of freedom
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Spatial multiplexing encryption with cascaded metasurfaces J. Opt. (IF 2.1) Pub Date : 2023-11-27 Zhixiang Fan, Yuetian Jia, Hongsheng Chen, Chao Qian
Recent years have witnessed rapid progresses in information encryption by harnessing different dimensions of light, yet, pushing the capacity of encrypted information is an endless goal. Meta-holographic encryption introduces an efficient method in optical information encryption. Here, we propose a spatial multiplexing encryption technique using cascaded metasurfaces, allowing multiple users to simultaneously
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Performance enhancement of optical communication system with cascaded FBGs of varying lengths J. Opt. (IF 2.1) Pub Date : 2023-11-27 Chaluvadi V Naga Bhaskar, Subhradeep Pal, Prasant Kumar Pattnaik
In this paper, an optical communication system constructed with cascaded fiber Bragg gratings or fiber Bragg gratings (FBGs) of varying lengths capable of operating in the C-band is presented. Here, initially, a passive optical device formed with four cascaded FBGs of varying lengths is proposed and analyzed. Subsequently, the proposed device is kept in the optical communication system to reduce the
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Effect of light ellipticity and polarization angle on the transient dynamics of the ground-state Hanle effect J. Opt. (IF 2.1) Pub Date : 2023-11-21 Raghwinder Singh Grewal
We report theoretical investigations on the transient dynamics of the ground-state Hanle effect in the Voigt geometry, where a time-varying scanning magnetic field B (t) is applied perpendicular to the light propagation direction. Transient Hanle signals are calculated for different light polarizations using a theoretical model based on the density matrix approach. First, we study the ellipticity dependence
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Deep learning in optics—a tutorial J. Opt. (IF 2.1) Pub Date : 2023-11-15 Barak Hadad, Sahar Froim, Erez Yosef, Raja Giryes, Alon Bahabad
In recent years, machine learning and deep neural networks applications have experienced a remarkable surge in the field of physics, with optics being no exception. This tutorial aims to offer a fundamental introduction to the utilization of deep learning in optics, catering specifically to newcomers. Within this tutorial, we cover essential concepts, survey the field, and provide guidelines for the
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Spectral response of sulfonated polystyrene photonic crystals with varying concentrations of ethanol J. Opt. (IF 2.1) Pub Date : 2023-11-10 Sree Sanker S S, Subin Thomas, Dhanya P Jacob, Savitha Nalini, K N Madhusoodanan
Modifying polystyrene (PS) spheres through sulfonation is a well-established method to enhance their hydrophilic properties, rendering them valuable in diverse applications. Fabrication of photonic crystals (PCs) with sulfonated polystyrene (SPS) spheres offers an important platform for sensing applications. The hydrophilic nature of such PC platform helps in improving the detection of water content
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Reflection by two level system: phase singularities on the Poincaré hypersphere J. Opt. (IF 2.1) Pub Date : 2023-11-07 Ben Lang, Edmund Harbord, Ruth Oulton
We consider the reflection of a photon by a two-level system in a quasi-one-dimensional waveguide. The waveguide polarisation at the location of the two-level system and the transition dipole are key determinants of the physics, controlling of the phase and amplitude of the scattered light in both directions. In most cases full control is possible by tuning only one of these two degrees of freedom
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All-dielectric terahertz metasurfaces for arbitrary linear polarization detection J. Opt. (IF 2.1) Pub Date : 2023-11-03 Wenhui Xu, Hui Li, Hang Xu, Qi Tan, Chunyu Song, Jianquan Yao
The polarization state, an intrinsic property of electromagnetic waves, plays a key role in determining the mechanism of light–matter interactions. Recently, the bulky elements for evaluating polarization states have been miniaturized by using metasurfaces. However, determining arbitrary linear polarization (LP) states from vortex beams generated by metasurfaces is quite challenging. Here, a general
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Using machine learning to predict dinitrogen molecule density by analyzing transient-dependent nonlinear pulse propagation in an air-filled hollow core photonic crystal fiber J. Opt. (IF 2.1) Pub Date : 2023-10-31 R E Jimenez-Mejia, Carlos Alvarez Ocampo, Rodrigo Acuna Herrera
Pulse propagation in air-filled hollow core photonic crystal fibers has been well investigated within the last decade to generate nonlinear phenomena such as pulse compression, frequency conversion, supercontinuum (SC) generation, among others, in a highly reliable and reproducible manner. In this work, we extend the analysis to take into account the recently evidenced pulsewidth dependency of the
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A conformal coding metasurface for dual polarization conversion and radar cross section (RCS) reduction J. Opt. (IF 2.1) Pub Date : 2023-10-31 Hamza Asif Khan, Jun Wei Zhang, Jing Cheng Liang, Jun Xia, Jingjing Zhang
Integrated meta-devices are the need of modern stealth application systems and have recently received a great deal of attention. Most studies have concentrated on the physics and structural design of planar metasurfaces, while conformal design that is suitable for arbitrarily curved surfaces has been rarely discussed. In this study, a conformal polarization-independent 1-bit coding metasurface (CM)
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Entanglement dynamics via periodic modulations in an optomechanical system with embedded double quantum dots J. Opt. (IF 2.1) Pub Date : 2023-10-26 Madhav Kumar Singh, Vijay Bhatt, Pradip K Jha, Aranya B Bhattacherjee
In our theoretical study, we explore the dynamic behavior and entanglement properties of a hybrid optomechanical system containing double quantum dots (QDs). The system is driven by a laser with amplitude modulation and we consider the modulation of the resonance frequency of the two QDs. Through the application of modulation techniques, we can achieve the targeted mean field value and effectively
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Coupling and thermosplasmonic properties of asymmetric hexagonal nanoframes J. Opt. (IF 2.1) Pub Date : 2023-10-26 A Azarian, F Noori
The interaction of light with asymmetric nanostructures leads to the coupling of plasmon modes. Understanding the nature and tunability of these hybridized plasmon modes is essential for both fundamental studies and the development of new applications. Herein, we systematically examine these coupled plasmon modes and heat generated by the asymmetric hexagonal nanoframes dimers (HNDs). Our results show
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Spatially divided two-step phase-shifting method for computational optical scanning holography J. Opt. (IF 2.1) Pub Date : 2023-10-26 Naru Yoneda, Osamu Matoba
Computational optical scanning holography (COSH) is one of the single-pixel incoherent digital holographic techniques; therefore, three-dimensional fluorescent objects can be measured as a digital hologram with a single-pixel detector. However, due to the requirement of a phase-shifting method to remove unnecessary components from holograms, the number of measurements of COSH is larger than the number
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Lattice constant and polarization-independent high transmission in tellurium-based dielectric metasurfaces J. Opt. (IF 2.1) Pub Date : 2023-10-19 Jayesh Sadasivan, Sivarama Krishnan, Jayasri Dontabhaktuni
High-refractive-index dielectric metasurfaces give rise to unprecedented control of light manipulation, such as control of phase, polarization and amplitude, giving rise to interesting properties, such as directional beam steering, polarization detectors and sensors. Dielectric metasurfaces of sub-wavelength dimensions have tremendous applications in the field of optics, such as negative refractive
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Grating assisted temperature insensitive micro-ring resonator biosensor J. Opt. (IF 2.1) Pub Date : 2023-10-19 Yogesh Kumar Verma, Soumya Kumari, Saurabh Mani Tripathi
A grating-assisted temperature-insensitive micro-ring resonator bio-sensor is reported using the finite-difference time-domain simulation method. In addition to choosing a negative thermo-optic coefficient (TOC) material, water, to nullify temperature-induced wavelength shift, optimization of the opto-geometric parameters provided a precisely zero-temperature sensitivity (TS) state of the structure
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Quasi-bound states in continuum in double-layer silicon gratings J. Opt. (IF 2.1) Pub Date : 2023-10-18 Kun Yu, Feng Song, Zhangxing Shi, Hongju Li, Yufang Liu, Xiaohu Wu
Bound states in the continuum (BICs) are theoretically known to possess infinite lifetimes and Q factor. However, due to the difficulties in achieving it in reality, symmetry breaking is often introduced in the structure to transform symmetrically protected BICs into quasi-BICs (q-BICs) with extremely high Q factor. Therefore, q-BICs can be utilized to enhance the Q factor of optical sensors. In this
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Nonlinear optical properties of methyl green investigated by the femtosecond Z-scan technique J. Opt. (IF 2.1) Pub Date : 2023-10-12 Fengzi Ling, Jiyun Qiu, Zhe Hu, Zhigao Luo, Dejun Liu, Pengfei Wang
The third-order optical nonlinearities of methyl green in aqueous solution are studied by the Z-scan technique using a femtosecond laser at 800 nm. The valley shape in the open aperture measurements reveals the presence of reverse saturable absorption effect, which is ascribed to the three-photon absorption process. The closed aperture Z-scan traces demonstrate a negative sign for the nonlinear refractive
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Tunable dual-plasmon induced transparency based on monolayer black phosphorus metamaterial and its sensing performance J. Opt. (IF 2.1) Pub Date : 2023-10-12 Rongrui Shi, Cheng Lei, Ting Liang, Taolong Wang, Shilin Liu
In this study, we propose a monolayer periodic structure of black phosphorus (BP) metamaterials in the mid-infrared region to achieve tunable dual-plasmon-induced transparency (PIT). The dual PIT effect was regulated by changing the carrier concentration of BP. The results obtained using the finite-difference time-domain method are very similar to those obtained using coupled modal theory. More importantly
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Multi-foci metalens based on all-dielectric metasurface with simultaneous amplitude and phase modulation J. Opt. (IF 2.1) Pub Date : 2023-10-12 Chong Qin, Wenhui Fan, Qi Wu, Xiaoqiang Jiang, Hui Yan
Metasurfaces provide a novel platform for designing high efficiency and multi-functional photonic devices with compact size. Multi-foci metalens have great potential in the applications of optical tomography technology, optical data storage, optical communication and photoelectric detection. Here, in order to broaden the functionality and applicability of multi-foci metalens, a scheme for designing
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Excitation of quantum oscillator by electromagnetic wavelet pulses J. Opt. (IF 2.1) Pub Date : 2023-10-11 V A Astapenko, T K Bergaliev
The excitation of a quantum oscillator at transitions between stationary states by wavelet pulses with zero and nonzero area as a function of their duration and amplitude is studied. The excitation from the ground state is examined in detail, together with the specific features of this process during excitation from excited states. Analytical expressions for the main characteristics of excitation probability
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Integrated silicon photonics chip fabricated by CMOS compatible technology for low-bit-error-rate quantum key distribution J. Opt. (IF 2.1) Pub Date : 2023-10-11 Zhen Zhen, Si-Yue Jin, Ren Jie, Xing-Sheng Xu
Quantum communication has extremely high security and is a development direction of future communication networks. In this paper, an on-chip path, off-chip polarization encoded quantum key distribution (QKD) chip is designed and fabricated using advanced silicon photonics fabrication technology. Using a special two-dimensional grating, we can convert light of different path states into corresponding
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Design of continuously tunable varifocal metalenses J. Opt. (IF 2.1) Pub Date : 2023-10-09 Fan Yang, Khoi Phuong Dao, Sensong An, Xiaoming Qiu, Yifei Zhang, Juejun Hu, Tian Gu
Active metasurfaces with tunable optical properties enable reconfigurable or programmable photonic systems that can swiftly adapt to different functional needs. Realizing continuous tuning of phase-gradient metasurfaces, however, remains elusive. This is because active modulation of individual or few meta-atoms is traditionally deemed essential to continuous tuning, which nonetheless introduces significant
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Superposing and modulating heterogeneous optical vortices of high-order orbital angular momentum J. Opt. (IF 2.1) Pub Date : 2023-10-05 Yidan Zhang, Hao Luo, Peng Li, Hao Guo, Suling Sang, Yuzong Gu, Zhenkun Wu
This article reports the preparation of high orbital angular momentum (OAM) using non-uniform beam interference both theoretically and experimentally. This study commences with the reconstruction of Bessel–Gaussian vortex beams utilizing power-exponential-phase vortices. Subsequently, two reconstructed beams are used for interfere, followed by the application of the phase multiplication technique.
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Calculating the area of a particular deformation region of an optical surface based on the finite element method J. Opt. (IF 2.1) Pub Date : 2023-09-28 Ruifeng Su
To study the deformation of an optical surface and its effect on optical performance, a method based on the finite element method for calculating the area of a particular deformation region of an optical surface is proposed, and a concept of effective area ratio is further introduced to describe the effect of deformation on optical performance. The principle of the method is presented, and the deformation
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Phase shifting to measure the modal composition of the scattered helical beam J. Opt. (IF 2.1) Pub Date : 2023-09-15 Tushar Sarkar, Amit Yadav, Tanushree Karmakar,, Rakesh Kumar Singh
We propose and experimentally demonstrate a non-interferometric and highly stable technique to recover the incident orbital angular momentum (OAM) modes from the randomly scattered coherent light. To implement and demonstrate this technique, a non-separable state is generated by encoding spiral and non-spiral modes into the orthogonal polarization bases prior to propagation through a random scattering
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Investigation of nonlinear optical response and all-optical switching/modulation in pyrromethene 567 based on spatial self-phase modulation J. Opt. (IF 2.1) Pub Date : 2023-09-13 Titu Thomas, Jayaprasad K V, Vijesh K R, V P N Nampoori, Manu Vaishakh
Investigation on the response of pyrromethene 567 samples under the influence of a high-intensity 532 nm laser is carried out. When an intense light beam is absorbed by a medium, the phase of the beam undergoes a modulation, which in turn produces an interference pattern. Herein, we report the thermo-optic coefficient dndT and nonlinear refractive index n 2 for low concentration of pyrromethene 567