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Enhanced circular dichroism of an X-shaped nanostructure by asymmetric surface plasmon interference J. Opt. (IF 2.1) Pub Date : 2024-04-17 Abduweli Abdukerim, Haximjan Abdusattar
A plasmonic chiral structure, which is a nanostructure composed of noble metals that lacks planar symmetry, demonstrates significant potential for various applications in bio-sensing, optical forces, switching and controlling the photoluminescence, and detecting chiral light. Understanding its fundamental property of circular dichroism (CD) is critical for these applications. Although the surface plasmon
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Analytical solution to second-harmonic generation of ultrashort laser pulse J. Opt. (IF 2.1) Pub Date : 2024-04-17 Yufei Peng, Chenyang Hu, Lihong Hong, Zhiyuan Li
We present an analytical method to evaluate the second-harmonic generation (SHG) process of ultrashort laser pulses in a nonlinear medium within the small-signal regime. Building upon the broadband nonlinear coupled wave theory, we derive an analytical solution that allows one to investigate the fundamental physics and detailed dynamics of the nonlinear interaction between ultrashort laser pulses.
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Creation and manipulation of optical Meron topologies in tightly focused electromagnetic field J. Opt. (IF 2.1) Pub Date : 2024-04-16 Haomai Lei, Bin Luo, Jianfei Hu, Jiming Wang, Tong Wu, Youwen Liu
The optical topology, which serves as a stable spatial electromagnetic structure, offers a new dimension for applications in the field of optical information processing, transmission, and storage. In recent years, there has been an increasing focus on these spatially structured light fields. By reversing the radiation of orthogonal dipole pairs, we propose an approach to generate Meron topologies within
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Research on the grouped orthonormalization method in ghost imaging J. Opt. (IF 2.1) Pub Date : 2024-04-15 Longfei Yin, Tiantian Liu, Xinlong Mai, Shilun Sun, Pengqi Yin, Guohua Wu, Bin Luo
Ghost imaging (GI) has found application across diverse fields owing to its distinctive benefits. When employing the rotating ground-glass scheme and utilizing second-order correlation for image reconstruction, the efficiency of imaging is hindered by the multiple sampling of reference patterns. To address this, the orthonormalization method has been employed to enhance image quality and reduce the
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Lasing emission from ZnO hierarchical spherical microcavity J. Opt. (IF 2.1) Pub Date : 2024-04-11 Ryosuke Komatsu, Sota Yoshino, Noriko Saito, Taisei Yamamoto, Toshihiro Nakamura
We investigated lasing characteristics of ZnO hierarchical micro-spherical particles with diameters of 1–5 μm . The lasing emission consists of a small number of discrete laser peaks unlike conventional random lasing from ZnO nanopowder-assembly. Theoretical calculations based on a many-body theory reveal that the optical gain is achieved at the observed lowest lasing threshold value, 4 mJ⋅cm−2⋅pulse−1
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Narrowband Mg/SiC multilayer mirror working as high-harmonic selector at 30.4 nm wavelength J. Opt. (IF 2.1) Pub Date : 2024-04-11 Zhe Zhang, Runze Qi, Qiushi Huang, Yufei Feng, Zhong Zhang, Tonglin Huo, Hongjun Zhou, Zhanshan Wang
Multilayers (MLs) are a good choice for high-harmonic generation (HHG) sources for selecting single-wavelength radiation. MLs working around 30.4 nm with a significantly reduced bandwidth based on high Bragg order reflection have been designed and fabricated. The narrowband MLs were characterized using grazing incidence x-ray reflectometry, extreme ultraviolet reflectivity, and intrinsic stress measurements
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Computation cost reduction in 3D shape optimization of nanophotonic components J. Opt. (IF 2.1) Pub Date : 2024-04-11 Md Mahadi Masnad, Nishat Salsabil, Dan-Xia Xu, Odile Liboiron-Ladouceur, Yuri Grinberg
Inverse design methodologies effectively optimize many design parameters of a photonic device with respect to a primary objective, uncovering locally optimal designs in a typically non-convex parameter space. Often, a variety of secondary objectives (performance metrics) also need to be considered before fabrication takes place. Hence, a large collection of optimized designs is useful, as their performance
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Scattering matrix for chiral harmonic generation and frequency mixing in nonlinear metasurfaces J. Opt. (IF 2.1) Pub Date : 2024-04-11 Kirill Koshelev, Ivan Toftul, Yongsop Hwang, Yuri Kivshar
We generalize the concept of optical scattering matrix (S-matrix) to characterize harmonic generation and frequency mixing in planar metasurfaces in the limit of undepleted pump approximation. We show that the symmetry properties of such nonlinear S-matrix are determined by the metasurface symmetries at the macroscopic and microscopic scale. We demonstrate that for description of degenerate frequency
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Application of the fractional Fourier transform for decryption in experimental optical cryptosystems J. Opt. (IF 2.1) Pub Date : 2024-04-05 Carlos Vargas-Castrillon, Alejandro Velez-Zea, John Fredy Barrera-Ramírez
In this contribution, we introduce a new practical approach to apply the fractional Fourier transform (FrFT) in the modeling of two optical systems: free space propagation (FSP) and a single lens processor (SLP). This formulation presents a simple way to stablish a direct relationship between physical parameters of the two optical systems and a real-valued fractional order. Furthermore, we employ and
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A four-band coherent perfect absorber of borophene metamaterial operating in the communication band J. Opt. (IF 2.1) Pub Date : 2024-04-04 Zhe Sun, Ting Xiang, Lingling Wang, Qi Lin
We propose a coherent perfect absorber based on a borophene metamaterial grating structure. Based on the theoretical analysis of the temporal coupled mode theory and the numerical results of the finite-difference time-domain simulations, the transmission characteristics of the system are investigated. The dynamic tunability of the absorption intensity and resonance wavelength is realized by adjusting
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High transmission of circularly polarized light and circular dichroism with all-dielectric metamaterial J. Opt. (IF 2.1) Pub Date : 2024-04-03 Jian Du, Wenhao Chen, Hanbin Zhang, Hancheng Wang, Zhujun Gao, Kaicheng Xu, Jiaming Tong, Jin Wang, Junjun Xue, Ting Zhi, Tao Tao
The optical chirality of metamaterials gives birth to distinct responses of left circularly polarized (LCP) and right circularly polarized (RCP) light, leading to asymmetric transmission and circular dichroism (CD) of circularly polarized light. In this work, meta-atom structure composed of square and semicircular combinations were designed, which exhibits extreme high ratio of transmission, reflection
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Multifunctional beam modulation based on gratings combined with additive metasurfaces J. Opt. (IF 2.1) Pub Date : 2024-04-03 Cong Chen, Peng Gao, Yaowei Dai, Xiamin Tong, Jingyuan Gao, Hai Liu
A design scheme combining grating and element additive metasurface is proposed in this paper. Multi-dimensional joint control of the phase, amplitude, angle and polarization and multi-functional integrated metasurface applications were realized by using the inherent characteristics of the light wave properties (polarization and wavelength). Firstly, suitable structural parameters are obtained based
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Wide-angle and Fano-shape contrast between emission and absorption in hybrid polariton-involved planar structure J. Opt. (IF 2.1) Pub Date : 2024-03-25 Liming Qian, Sicheng Xu, Jingfei Ye, Shixin Pei, Gaige Zheng
Nonreciprocal light propagation in planar structure has become a hot topic because of the pattern-free fabrication process and the potentials for exploring heat transfer and energy management. An effective strategy incorporated with natural van der Waals material (α-phase molybdenum trioxide, α-MoO3), ultra-thin polar crystal (silicon carbide, SiC) thin film and a Weyl semimetal interlayer sitting
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Compact super-Gaussian evanescent beam expanders for integrated photonics J. Opt. (IF 2.1) Pub Date : 2024-03-25 Dmitry Kouznetsov, Qingzhong Deng, Günay Yurtsever, Pieter Neutens, Victor Garcia-Munoz, Manuel Matos, Andim Stassen, Pol Van Dorpe, Niels Verellen
This paper presents the modeling, design and experimental validation of integrated optical super-Gaussian evanescent beam expanders. A general analytical model for converting the mode of a single mode waveguide into a wide super-Gaussian slab mode is derived and the design procedure is described. Several structures have been experimentally verified on wafer scale and the results are in good correspondence
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Recent major advancements in perovskite solar cells J. Opt. (IF 2.1) Pub Date : 2024-03-25 Lijia Xu, Si Wang, Mingbo Pu, Yinghui Guo, Xiong Li, Xiangang Luo
Perovskite solar cells (PSCs) have gained intensive attention as promising next-generation photovoltaic technologies because of their ever-increasing power conversion efficiency, inexpensive material components, and simple fabrication method of solution processing. The efficiency and long-term stability of PSCs have gradually grown in recent years, and steady progress has been made towards the large
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Inverse-designed metasurfaces with facile fabrication parameters J. Opt. (IF 2.1) Pub Date : 2024-03-21 You Zhou, Yixuan Shao, Chenkai Mao, Jonathan A Fan
Optical metasurfaces are planar nanostructured devices that are industrially attractive in part because they utilize high-throughput microelectronic fabrication techniques for implementation. It is therefore critical to develop design paradigms that can balance the realization of highly efficient wavefront responses together with device manufacturability. We introduce a gradient-based design framework
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Polarization detection employing the spectra of composite vortex beams with multi-mode: associating the polarization handedness and topological charge sign J. Opt. (IF 2.1) Pub Date : 2024-03-15 Aning Ma, Haofeng Huang, Xinyi Tian, Guojian Li, Kai Ma, Hao Guo, Di Geng, Yurong Wang
Polarization detection has been widely used in various fields, especially in free-space optical communication associating with orbital angular momentum (OAM). However, the bulky optical devices and the complexity of the detection process have hindered the integration and miniaturization of communication systems. Herein, a novel polarization detection method is proposed to directly identify the polarization
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Degree of polarization in dissipative optical systems J. Opt. (IF 2.1) Pub Date : 2024-03-14 M J Cirino, P A Brandão
The polarization matrix formalism is employed to analyze the polarization properties of transmitted narrowband light through several optical setups involving active and dissipative structures. It is demonstrated that the degree of polarization of the output light can increase after propagation in a active/dissipative periodic media. Furthermore, the impact of introducing optical elements like polarizers
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Ultra-thin water-based metasurface with dual-broadband perfect absorption J. Opt. (IF 2.1) Pub Date : 2024-03-14 Ting Chen, Zhaoyang Shen, Han Liu
The rapid development of the 5 G technology can be attributed to its outstanding penetration in the low frequency bands ranging from 600 MHz to 6 GHz, particularly in specific frequency ranges like 700 MHz, 2.3 GHz, and 3.5 GHz. Simultaneously, the technology excels in the millimeter-wave spectrum, spanning from 24 GHz to 52 GHz, notably in bands such as 24.25–27.5 GHz and 37–40 GHz, showcasing impressive
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Effect of water salinity on the focal tuning of an injected liquid lens used to modify the z-scan method J. Opt. (IF 2.1) Pub Date : 2024-03-13 Yeganeh Shahsavand, Safoura Karimarji, Alireza Khorsandi
A water-injected liquid lens is fabricated to tune its focal length using the change in water salinity. It is found that when the salinity of water is changed from zero to 34.25%, the focal length can be changed by about 12.6 mm from 73.7 mm to 86.3 mm. A focal length resolution of approximately 0.75 × 10−2 mm and high temporal stability over a long period have been achieved for the lens foci. This
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Vortex plate retarder-based approach for the generation of sub-20 fs light pulses carrying orbital angular momentum J. Opt. (IF 2.1) Pub Date : 2024-03-12 Tlek Tapani, Haifeng Lin, Aitor De Andres, Spencer W Jolly, Hinduja Bhuvanendran, Nicolò Maccaferri
We use a vortex retarder-based approach to generate few optical cycles light pulses carrying orbital angular momentum (OAM) (known also as twisted light or optical vortex) from a Yb:KGW oscillator pumping a noncollinear optical parametric amplifier generating sub-10 fs linearly polarized light pulses in the near infrared spectral range (central wavelength 850 nm). We characterize such vortices both
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Dual-shot approach for polarization retrieval through a scattering medium J. Opt. (IF 2.1) Pub Date : 2024-03-12 Abhijit Roy, Reajmina Parvin, Ankita Karmakar, Abhishek Mandal, Rakesh Kumar Singh, Maruthi M Brundavanam
A dual-shot technique based on the field basis addition of two statistically independent speckle patterns is developed to recover an input polarization through a scattering layer. It is proposed theoretically, and demonstrated both numerically and experimentally that by tuning the linear polarization orientation of the reference speckle pattern to 0° and 45° w.r.t. the x-axis, polarization retrieval
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Monitoring of multiple fabrication parameters of electrospun polymer fibers using mueller matrix analysis J. Opt. (IF 2.1) Pub Date : 2024-03-12 Gaurav Sharma, Lennart Jütte, Jigar Gopani, Jules Brehme, Axel Günther, Ralf Sindelar, Franz Renz, Bernhard Roth
Electrospun polymer fiber mats feature versatile applications in tissue engineering, drug delivery, water treatment and chemical processes. The orientation of fibers within these mats is a crucial factor that significantly influences their properties and performance. However, the analysis of fiber samples using scanning electron microscopy (SEM) has limitations such as time consumption, fixed assembly
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Asymptotic evolution of speckle patterns to synthesize non-homogeneous string beams J. Opt. (IF 2.1) Pub Date : 2024-03-11 B Tellez-Garcia, P Martinez-Vara, A Perez-Leija, J C Ramirez-San-Juan, I Julián-Macías, G Martinez-Niconoff
We analyze the evolution of the speckle pattern subjected to a compression showing that the spatial evolution of the probability density function satisfies a non-linear diffusion equation. Its asymptotic solution corresponds to a non-homogeneous wave with string-shape. During the compression, an irradiance interaction is generated between the speckles. The interaction satisfies a type-logistic equation
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Spatial coherence research and passive speckle suppression for edge-emitting broad-area semiconductor lasers J. Opt. (IF 2.1) Pub Date : 2024-03-11 Ao Chen, WeiQiao Zhang, XuYan Zhou, Jing Liu, WanHua Zheng
The spatial coherence of filaments in edge-emitting broad-area semiconductor lasers (BALs) is studied based on speckle theory, and a passive speckle suppression method for BALs is demonstrated. A fly-eye lens is used to integrate the filaments and homogenize the laser beam. The speckle contrast is consistent with theoretical calculation, which proves the spatial incoherence of filaments. A light pipe
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Optical design of reflective Bragg mirrors for EUV photolithography J. Opt. (IF 2.1) Pub Date : 2024-03-08 Yu-Yen Tsai, Ting-Wei Chen
In this article. we investigate the optical characteristics of reflective extreme-ultraviolet (EUV) mirrors for the application of lithography for 7 nm node and below. By using the conventional quarter-wavelength stacked Bragg reflective configuration of Si-based metal multilayers centered at soft x-ray 13.5 nm, the maximum reflection is numerically computed to be approximately 0.7 at nearly normal
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A five-band terahertz metamaterial absorber with properties of polarization-insensitive and wide-angle tolerance based on bulk Dirac semimetal J. Opt. (IF 2.1) Pub Date : 2024-03-08 Xuefeng Qin, Jieying Jiang, Guiyuan Duan, Chongyang Xu, Xiangyang Zhang, Huaxin Zhu, Yang Huang, Nianxi Xu, Ben-Xin Wang
We design a bulk Dirac semimetal (BDS) metamaterial-based terahertz absorber consisted of a BDS layer, a dielectric layer and a gold grounding layer from top to bottom, which produces five excellent terahertz absorption peaks having 99.55%, 99.63%, 99.65%, 97.72%, and 99.87% absorption at 0.49 THz, 0.85 THz, 1.68 THz, 2.00 THz, and 2.27 THz, respectively. The five-band BDS-based absorber is polarization-insensitive
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Germanene: demonstration of the conversion from mode-locked to Q-switched mode-locked in Er-doped fiber laser J. Opt. (IF 2.1) Pub Date : 2024-03-08 Yunao Han, Weiyu Fan, Shuo Sun, Caixun Bai, Guomei Wang, Huanian Zhang, Wenfei Zhang, Chonghui Li, Shicai Xu, Shenggui Fu, Cheng Lu
Some two-dimensional layered mono-elemental materials have been reported as saturable absorbers (SAs) for the generation of various soliton phenomena, and many excellent results have been achieved. In our experiment, we made thin films of germanene-polyvinyl alcohol (Ge-PVA) and applied them as SA in Er-doped fiber lasers, investigated Ge’s characteristics, and demonstrated the conversion from mode-locked
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Pattern effect suppression of pulse signals based on pre-signal control method J. Opt. (IF 2.1) Pub Date : 2024-03-07 Yifan Wang, Meng Guo, Zehui Lu, Yuan Yao, Hao Zhang, Bo Liu, Shaoxiang Duan, Haifeng Liu, Wei Lin
By using the pre-signal light as the control light, we propose a method to suppress the transient effect of erbium-doped fiber amplifiers for low-frequency pulse signals. The pattern effect of the pulse signals within the low frequency range (400–1000 Hz) and 1550 nm band is relieved, and the optical surge coefficient Cs decreases to about 0.54 dB. Experimental results show that the proposed method
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Compact and efficient lossy mode resonant refractive index sensor for aqueous environment J. Opt. (IF 2.1) Pub Date : 2024-03-07 Vinod K Sharma
A very short length high sensitivity, large figure of merit and very high resolution integrated-photonic refractometer for aqueous environment operating in visible region of wavelength is proposed. The sensor design depends on the periodic coupling of the guided dielectric optical waveguide mode field and the lossy mode field of the conducting indium-tin-oxide thin film. Various layer thicknesses can
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Weak measurement of the Goos–Hänchen shift for a Hermite–Gaussian laser beam J. Opt. (IF 2.1) Pub Date : 2024-03-06 Soumen Mandal, Akash Das, Manik Pradhan
We report on an experimental investigation of the Goos–Hänchen (GH) optical beam shift in the vicinity of the critical angle of incidence at an air–glass interface using a weak value amplification (WVA) technique for two mutually orthogonal first order Hermite–Gaussian (HG) modes (HG10 and HG01) of a light beam at 633 nm generated by a phase-only reflective spatial light modulator. We have developed
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Parity-time imbalance induced by balanced gain and loss medium in non-Hermitian photonic crystals J. Opt. (IF 2.1) Pub Date : 2024-03-05 Qianxing Wang, Bobo Liu, Lei Ying
Photonic crystals, including gain and loss materials, show numerous intriguing features than the ordinary photonic crystals. In this work, using the full wave simulation, we numerically investigate the photonic crystals with gain and loss which are satisfying the parity-time (PT) symmetry condition to reveal the effect of PT symmetry on the optical properties of photonic crystals, including the exceptional
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Polarization-independent dislocation modes in photonic crystals J. Opt. (IF 2.1) Pub Date : 2024-03-05 Wen-Jin Zhang, Hao-Chang Mo, Zi-Xuan Gao, Xiao-Dong Chen, Jian-Wen Dong
Recently, gapless dislocation modes along the synthetic translation dimensions are proposed in two-dimensional photonic crystals. However, gapless dislocation modes are specific to either transverse magnetic or transverse electric polarization, hindering their utility in polarization-independent optics. In this work, we achieve polarization-independent dislocation modes in the crossing of gapless dislocation
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Computational ghost imaging with adaptive intensity illumination for scenes featuring specular surfaces J. Opt. (IF 2.1) Pub Date : 2024-03-04 Jiahao Xiong, Xuan Zhang, Ai Fu, Hong-Chao Liu
Imaging a target scene with specular surfaces is a daunting challenge for both direct imaging and indirect computational imaging techniques. The intense specular reflection component during the measurement severely degrades the quality of the reconstructed image, resulting in a substantial loss of scene information. To address this issue, we propose a computational ghost imaging (CGI) method with adaptive
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Bi-directional high-order orbital angular momentum mode generation using gratings in high numerical aperture fiber J. Opt. (IF 2.1) Pub Date : 2024-02-29 Avijit Koley, Saurabh Mani Tripathi
We propose a novel design and theoretically analyse it for bi-directional orbital angular momentum (OAM) mode generation in high numerical aperture (NA) optical fibers using the combination of a long period grating (LPG), a short-period (Bragg) grating and a three-port optical circulator. The proposed design consists only of standard fiber gratings rather than specially designed fibers, such as ring-shaped
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Optical response properties and bipartite entanglement in a hybrid optomechanical system assisted by Kerr-nonlinearity and amplitude modulated drive field J. Opt. (IF 2.1) Pub Date : 2024-02-29 Surabhi Yadav, Vijay Bhatt, Aranya B Bhattacherjee, Pradip K Jha
We theoretically investigate the optomechanical interaction between an optical field and a mechanical mode mediated by a Kerr nonlinear medium inside an optical cavity and simultaneously driven by an external amplitude-modulated pump field and a probe field. We show that switching between bistability and multistability is influenced by the rocking parameter and Kerr nonlinearity. Further, we study
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SOI Based metasurface for broadband perfect reflection in visible spectrum J. Opt. (IF 2.1) Pub Date : 2024-02-29 Ankit1, Kamal Kishor, Ravindra Kumar Sinha
We propose modeling and design of a low-loss all-dielectric metasurface (DM), comprised of Silicon on Insulator (SiO2) substrate to demonstrate a perfect reflector in the visible spectrum. The proposed metasurface unit cell consists of V and W shapes arranged in a mirror image configuration, with nanometre-sized gaps (g) between them. A narrow peak with a nearly 100% reflectance and a broad perfect
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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, Kuo 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