Journal of Optics最新文献_第5页

Electromagnetically induced transparent bimodal to unimodal conversion realized by the nematic liquid crystal 向列液晶实现的电磁诱导透明双模到单模转换

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-06-24 DOI: 10.1088/2040-8986/ad58f2

Jian Yu Gong, Fang Yao Fang, Rui Lin Xiao and Hai Feng Zhang

{"title":"Electromagnetically induced transparent bimodal to unimodal conversion realized by the nematic liquid crystal","authors":"Jian Yu Gong, Fang Yao Fang, Rui Lin Xiao and Hai Feng Zhang","doi":"10.1088/2040-8986/ad58f2","DOIUrl":"https://doi.org/10.1088/2040-8986/ad58f2","url":null,"abstract":"In this paper, under the action of a gigahertz (GHz) band circularly polarized (CP) wave, a kind of CP metastructure (MS) is proposed. Recently, the nematic liquid crystal (NLC) has received great attention, but it is still difficult to realize the electromagnetically induced transparency (EIT) bimodal to unimodal under the control of NLC. Through the direct mutual coupling of the metal cross resonator, metal ring resonator, and dielectric cross resonator, modes coupling can be formed and generate transparent windows. Two different EIT states (unimodal and bimodal EIT) accompanied by slow light effects can be observed by regulating the NLC with the applied bias voltage (Vbias). When the Vbias is 0 V, two transparent windows can be achieved in the 6.595–8.443 GHz and 8.443–10.161 GHz bands. When Vbias is 20 V, only one transparent window can be achieved in the 6.891–8.682 GHz band. Due to the high symmetry, the MS has the polarization insensitivity to CP waves. These extremely excellent properties make this MS have a wide application prospect. Noteworthy, the theoretical calculation result of EIT is verified by the two-oscillator theory model and circuit model, the results obtained are basically consistent with the simulation results.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"25 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Plasmon-enhanced chiral absorption through electric dipole–electric quadrupole interaction 通过电偶极子-电四极子相互作用实现质子增强手性吸收

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-06-20 DOI: 10.1088/2040-8986/ad535e

Hanwei Wang and Yang Zhao

引用次数: 0

Switchable image displays in tri-channel phase-change metasurfaces 三通道相变元表面中的可切换图像显示器

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-06-19 DOI: 10.1088/2040-8986/ad569c

Bo Wang, Yifan Li, Yilong Cui, Chenxuan Xiang, Kenan Guo, Shuyuan Xiao and Tingting Liu

引用次数: 0

Inverse designed WS2 planar chiral metasurface with geometric phase 具有几何相位的反设计 WS2 平面手性元表面

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-06-18 DOI: 10.1088/2040-8986/ad53df

Jaegang Jo, Sangbin Lee, Munseong Bae, Damian Nelson, Kenneth B Crozier, Nanfang Yu, Haejun Chung and Sejeong Kim

{"title":"Inverse designed WS2 planar chiral metasurface with geometric phase","authors":"Jaegang Jo, Sangbin Lee, Munseong Bae, Damian Nelson, Kenneth B Crozier, Nanfang Yu, Haejun Chung and Sejeong Kim","doi":"10.1088/2040-8986/ad53df","DOIUrl":"https://doi.org/10.1088/2040-8986/ad53df","url":null,"abstract":"Increasing attention is being paid to chiral metasurfaces due to their ability to selectively manipulate right-hand circularly polarized light or left-hand circularly polarized light. The thin nature of metasurfaces, however, poses a challenge in creating a device with effective phase modulation. Plasmonic chiral metasurfaces have attempted to address this issue by increasing light–matter interaction, but they suffer from metallic loss. Dielectric metasurfaces made from high-index materials enable phase modulation while being thin. Very few materials, however, have high refractive index and low loss at visible wavelengths. Recently, some 2D materials have been shown to exhibit high refractive index and low loss in the visible wavelengths, positioning them as promising platforms for meta-optics. This study introduces and details a planar chiral metasurface with a geometric phase composed of WS2 meta-units. By employing adjoint optimization techniques, we achieved broadband circular dichroism ( 0.5 in the wavelength range of 653–796 nm) and a high extinction ratio (19.6 dB at λ = 675 nm).","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"156 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141506332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tripartite entanglement in a detuned non-degenerate optical parametric oscillator 失谐非退化光参量振荡器中的三方纠缠

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-06-13 DOI: 10.1088/2040-8986/ad52a2

Jun Guo, Jianfeng Tian and Hengxin Sun

{"title":"Tripartite entanglement in a detuned non-degenerate optical parametric oscillator","authors":"Jun Guo, Jianfeng Tian and Hengxin Sun","doi":"10.1088/2040-8986/ad52a2","DOIUrl":"https://doi.org/10.1088/2040-8986/ad52a2","url":null,"abstract":"Continuous variable multipartite entanglement is an important resource in quantum optics and quantum information. Non-degenerate optical parametric oscillator (NOPO), generally working in a resonant regime, can generate high quality tripartite entanglement. However, the detuning in a real experiment is inevitable and sometimes necessary, for instance, in an optomechanical system. We calculate the tripartite entanglement from a detuned triply quasi-resonant NOPO. Unlike the previous literature using inseparability criterion, we use the positivity of partial transpose, a sufficient and necessary criterion, to characterize the tripartite entanglement with full inseparability generated from a detuned NOPO. We also consider the influence of the pump and signal/idler losses on the tripartite entanglement. The results show that, the tripartite entanglement could exist even with a large detuning of several times cavity linewidth, and may be better for a detuned regime than for the resonant one under some conditions. With a fixed non-zero loss which always exists in a real experiment, an appropriate value of non-zero detuning could lead to the best entanglement. What’s more, unlike the bipartite entanglement, which exists both below and above threshold, the tripartite entanglement only occurs for a nonzero classical amplitude of signal/idler field. The jumping between the tripartite and bipartite entanglement could make the NOPO become a quantum state switch element, which promises a potential application on the multiparty quantum secret sharing.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"171 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141506333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Double Hanle resonance dependence on light polarization angle and transverse magnetic field direction 双汉勒共振与光偏振角和横向磁场方向的关系

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-06-12 DOI: 10.1088/2040-8986/ad53e0

Pooja Kumari, Shrey Mehta, Raghwinder Singh Grewal and R P Singh

{"title":"Double Hanle resonance dependence on light polarization angle and transverse magnetic field direction","authors":"Pooja Kumari, Shrey Mehta, Raghwinder Singh Grewal and R P Singh","doi":"10.1088/2040-8986/ad53e0","DOIUrl":"https://doi.org/10.1088/2040-8986/ad53e0","url":null,"abstract":"We present experimental and theoretical investigations of the dependence of double Hanle resonance spectrum on the light polarization angle and the direction of the applied transverse magnetic field (TMF). The experiments are done for transition of 87Rb D1 line using a rubidium vapor cell containing buffer gas. We show that a small light polarization component along the direction of TMF introduces asymmetry in the double Hanle resonance signal. Both the magnitude and sign of asymmetry in the signal are sensitive to the TMF orientation, suggesting a possible method for in-situ measurement of the direction of the magnetic fields generated by the coils. The physical origin of this asymmetry is explained by considering the redistribution of population among the ground-state Zeeman sublevels in the presence of TMF. In addition, we systematically vary both the polarization angle and TMF direction to study their effect on the line profile of Hanle resonances. We demonstrate that a double Hanle resonance changes to a dark Hanle resonance by rotating the light polarization vector irrespective of the TMF direction. We have developed a simple theoretical model based on a degenerate two-level system to explain our experimental observations.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"67 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141506385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electromagnetic surface waves guided by the interface of a metal and a tightly interlaced matched ambidextrous bilayer 金属与紧密交错的匹配双层膜界面引导的电磁表面波

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-06-12 DOI: 10.1088/2040-8986/ad52a1

Roberta De Simone, Francesco Chiadini, Vincenzo Fiumara and Akhlesh Lakhtakia

引用次数: 0

Low-complexity EVM estimation based on artificial neural networks for coherent optical systems 基于人工神经网络的相干光系统低复杂度 EVM 估算

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-06-12 DOI: 10.1088/2040-8986/ad529f

Dhirendra Kumar Jha and Jitendra K Mishra

{"title":"Low-complexity EVM estimation based on artificial neural networks for coherent optical systems","authors":"Dhirendra Kumar Jha and Jitendra K Mishra","doi":"10.1088/2040-8986/ad529f","DOIUrl":"https://doi.org/10.1088/2040-8986/ad529f","url":null,"abstract":"With continuous growth in modulation formats, the requirement for autonomous devices is becoming more important than ever. Predicting error vector magnitude (EVM) of m-ary quadrature amplitude modulation (mQAM) are intricate issue for the effective design of transmission systems. Existing estimation techniques have survived through repetitive processes that are frequently computationally expensive, and time-consuming. Recently deep learning approaches demonstrated good performance as useful computational tools, offering a different way for accelerating such mQAM simulations. This paper introduces an artificial neural network (ANN) architecture that aims to forecast the EVM of the popular modulation forms including 18 Gbaud 8QAM, 14 Gbaud 16QAM, and 10 Gbaud 64QAM under different transmission conditions. Amplitude histograms (AHs) are produced from constellation diagrams obtained with varying launch power, laser linewidth, OSNR, and transmission distance by an offline preprocessing flow. The fully trained framework exhibits superior performance in terms of computing cost compared to the simulation experiments. The overall execution time of the ANN-based modeling method is approximately 234 s as opposed to more than 23000 s when employing the simulation technique, resulting in a 99% reduction in computation time. As a result, this technology opens the door to quick, all-encompassing techniques for characterizing and analyzing optical fiber problems.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"27 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A theoretical study on deep ultraviolet supercontinuum generation in subwavelength optical fiber 亚波长光纤中深紫外超连续真空产生的理论研究

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-06-11 DOI: 10.1088/2040-8986/ad529e

Weihua Shi, Yuying Gu, Tiantian Zhang

引用次数: 0

Optical trimer: a theoretical physics approach to waveguide couplers 光学三聚体：波导耦合器的理论物理方法

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-06-11 DOI: 10.1088/2040-8986/ad44aa

A Stoffel, S F Caballero-Benitez and B M Rodríguez-Lara

{"title":"Optical trimer: a theoretical physics approach to waveguide couplers","authors":"A Stoffel, S F Caballero-Benitez and B M Rodríguez-Lara","doi":"10.1088/2040-8986/ad44aa","DOIUrl":"https://doi.org/10.1088/2040-8986/ad44aa","url":null,"abstract":"We study electromagnetic field propagation through an ideal, passive, three-dimensional, triangular three-waveguide coupler using a symmetry-based approach that capitalizes on the underlying su(3) symmetry. The planar version of this platform has already demonstrated its utility in photonic circuit design, enabling optical sampling, filtering, modulating, multiplexing, and switching. We aim to provide a practical tutorial on using group theory for the analysis of photonic lattices for those less familiar with abstract algebra methods. This approach serves as a powerful tool for optical designs. To illustrate this, we focus on the equilateral trimer, connected to the discrete Fourier transform, and the isosceles trimer, related to the golden ratio, providing stable single waveguide output. We also explore a scenario where the coupling in an equilateral coupler changes linearly with propagation distance. Going beyond the standard optical-quantum analogy, we show that coupled-mode equations for intensity and phase allows us to calculate envelopes for inputs within an intensity class, as well as individual input field amplitudes. This approach streamlines the design process by eliminating the need for point-to-point propagation calculations, highlighting the power of group theory in the field of photonic design.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"39 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0