Journal of Physics-Photonics最新文献

Wavefront shaping simulations with augmented partial factorization 利用增强偏因式进行波阵面整形模拟

IF 3.8

Journal of Physics-Photonics Pub Date : 2024-09-15 DOI: 10.1088/2515-7647/ad68df

Ho-Chun Lin, Zeyu Wang and Chia Wei Hsu

引用次数: 0

An efficient compact blazed grating antenna for optical phased arrays 用于光学相控阵的高效紧凑型炽光栅天线

IF 3.8

Journal of Physics-Photonics Pub Date : 2024-09-02 DOI: 10.1088/2515-7647/ad6ed4

Henna Farheen, Suraj Joshi, J Christoph Scheytt, Viktor Myroshnychenko, Jens Förstner

{"title":"An efficient compact blazed grating antenna for optical phased arrays","authors":"Henna Farheen, Suraj Joshi, J Christoph Scheytt, Viktor Myroshnychenko, Jens Förstner","doi":"10.1088/2515-7647/ad6ed4","DOIUrl":"https://doi.org/10.1088/2515-7647/ad6ed4","url":null,"abstract":"Phased arrays are vital in communication systems and have received significant interest in the field of optoelectronics and photonics, enabling a wide range of applications such as LiDAR, holography, and wireless communication. In this work, we present a blazed grating antenna that is optimized to have upward radiation efficiency as high as 80% with a compact footprint of 3.5 <italic toggle=\"yes\">µ</italic>m × 2 <italic toggle=\"yes\">µ</italic>m at an operational wavelength of 1.55 <italic toggle=\"yes\">µ</italic>m. Our numerical investigations demonstrate that this antenna in a <inline-formula>\u0000<tex-math><?CDATA $64times64$?></tex-math><mml:math overflow=\"scroll\"><mml:mrow><mml:mn>64</mml:mn><mml:mo>×</mml:mo><mml:mn>64</mml:mn></mml:mrow></mml:math><inline-graphic xlink:href=\"jpphotonad6ed4ieqn1.gif\"></inline-graphic></inline-formula> phased array configuration is capable of producing desired far-field radiation patterns. Additionally, our antenna possesses a low side lobe level of −9.7 dB and a negligible reflection efficiency of under 1%, making it an attractive candidate for integrated optical phased arrays.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Highly reflective and high-Q thin resonant subwavelength gratings 高反射和高 Q 值薄型谐振亚波长光栅

IF 3.8

Journal of Physics-Photonics Pub Date : 2024-08-27 DOI: 10.1088/2515-7647/ad70e7

Gurpreet Singh, Trishala Mitra, Søren P Madsen, Aurélien Dantan

引用次数: 0

A modular GUI-based program for genetic algorithm-based feedback-assisted wavefront shaping 基于遗传算法的反馈辅助波前整形模块化图形用户界面程序

IF 3.8

Journal of Physics-Photonics Pub Date : 2024-08-23 DOI: 10.1088/2515-7647/ad6ed3

Benjamin R Anderson, Andrew O’Kins, Kostiantyn Makrasnov, Rebecca Udby, Patrick Price, Hergen Eilers

引用次数: 0

A practical guide to digital micro-mirror devices (DMDs) for wavefront shaping 用于波前整形的数字微镜设备 (DMD) 实用指南

IF 3.8

Journal of Physics-Photonics Pub Date : 2024-08-23 DOI: 10.1088/2515-7647/ad6dc0

Sébastien M Popoff, Rodrigo Gutiérrez-Cuevas, Yaron Bromberg, Maxime W Matthés

引用次数: 0

STAR-FDTD: space-time modulated acousto-optic guidestar in disordered media STAR-FDTD：无序介质中的时空调制声光导引星

IF 3.8

Journal of Physics-Photonics Pub Date : 2024-08-22 DOI: 10.1088/2515-7647/ad6ed2

Michael Raju, Baptiste Jayet, Stefan Andersson-Engels

{"title":"STAR-FDTD: space-time modulated acousto-optic guidestar in disordered media","authors":"Michael Raju, Baptiste Jayet, Stefan Andersson-Engels","doi":"10.1088/2515-7647/ad6ed2","DOIUrl":"https://doi.org/10.1088/2515-7647/ad6ed2","url":null,"abstract":"We developed a 2D Finite-difference time-domain (FDTD) method for modeling a space-time modulated guidestar targeting wavefront shaping applications in disordered media. Space-time modulation in general (a particular example being the acousto-optic effect) is used here as a guidestar for the transverse confinement of light around the tagged region surrounded by disorder. Together with the guidestar, the iterative optical phase conjugation (IOPC) method is used to overcome the diffusion of light due to multiple scattering. A phase sensitive lock-in detection technique is utilized to estimate the steady-state amplitude and phase of the modulated wavefronts emerging from the guidestar region continuously operating in the Raman-Nath regime. As the IOPC scheme naturally converges to the maximally transmitting eigenchannel profile, one could use the position of the guidestar within the disorder to channelize the maximal transmission through the tagged region. The associated code developed in MATLAB<sup>®</sup> is provided as an open source (The MIT License) package. The code package is referred by the acronym STAR-FDTD where STAR stands for <bold>S</bold>pace-<bold>T</bold>ime modulated <bold>A</bold>cousto-optic guidesta<bold>R</bold>.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Smartphone-based diagnostics with coherent and infrared imaging for cultural heritage 基于智能手机的文化遗产相干和红外成像诊断技术

IF 3.8

Journal of Physics-Photonics Pub Date : 2024-08-14 DOI: 10.1088/2515-7647/ad6abc

Claudia Daffara, Dario Ambrosini

{"title":"Smartphone-based diagnostics with coherent and infrared imaging for cultural heritage","authors":"Claudia Daffara, Dario Ambrosini","doi":"10.1088/2515-7647/ad6abc","DOIUrl":"https://doi.org/10.1088/2515-7647/ad6abc","url":null,"abstract":"Nondestructive optical techniques are crucial in heritage science for monitoring the condition of artworks in full field. Various imaging methods based on infrared and interferometry techniques have been proposed, but they often require specialized training and expensive equipment. This paper explores the emerging field of smartphone science and its potential to revolutionize artwork diagnostics, especially for cultural institutions with limited budgets. The smartphone science approach is divided into using the device ‘as is’ or enhancing it with add-on sensors. After a concise overview of smartphone sensing in different fields, the paper demonstrates smartphone-based optical diagnostics on traditional wooden painting models, employing coherent techniques like laser speckle imaging and moiré fringe technique, and infrared techniques like reflectography and thermography. The comparison of obtained results with established instrumentation in the field clearly shows that smartphone-based diagnostics have the potential to greatly contribute to cultural heritage preservation and conservation, transforming the field’s accessibility and cost-effectiveness.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Topological THz on-chip valley–spin converter 拓扑太赫兹片上山谷-自旋转换器

IF 3.8

Journal of Physics-Photonics Pub Date : 2024-08-13 DOI: 10.1088/2515-7647/ad68de

Yudong Ren, Xinrui Li, Ning Han, Li Zhang, Rui Zhao, Qiaolu Chen, Yuze Hu, Mingyu Tong, Song Han, Yihao Yang

{"title":"Topological THz on-chip valley–spin converter","authors":"Yudong Ren, Xinrui Li, Ning Han, Li Zhang, Rui Zhao, Qiaolu Chen, Yuze Hu, Mingyu Tong, Song Han, Yihao Yang","doi":"10.1088/2515-7647/ad68de","DOIUrl":"https://doi.org/10.1088/2515-7647/ad68de","url":null,"abstract":"Topological photonics offers a powerful platform for next-generation nanophotonic chips, capitalizing on their remarkable resilience to disorder and defects. Among the two-dimensional (2D) photonic topological insulators, valley-Hall (VH) and pseudo-spin-Hall (PSH) topological insulators have emerged as the most practical designs, as they do not require breaking time-reversal symmetry. These photonic topological insulators support robust edge states, demonstrating promising potential for a wide range of applications, from on-chip communication to optical computing and sensing. However, the conversion between distinct topological phases (VH and PSH) in terahertz (THz) band has not been achieved. Here we experimentally demonstrate a THz on-chip spin–valley converter through adiabatic evolution in 2D parameter space without closing the bulk bandgap. By leveraging the adiabatic phase transition, we confirm the high-efficiency conversion between two valley states in a valley–spin–valley converter. In addition, we verify the robustness of THz PSH topological energy transport through sharply twisted corners. Our findings not only advance the understanding of topological phases in photonics but also hold promise for the development of innovative photonic devices with enhanced performance and functionality.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-modal flexible and inexpensive plasmonic metasurface for wide range of refractive index sensing 用于大范围折射率传感的多模式灵活廉价质子元表面

IF 3.8

Journal of Physics-Photonics Pub Date : 2024-08-07 DOI: 10.1088/2515-7647/ad6963

Vaswati Biswas and R Vijaya

{"title":"Multi-modal flexible and inexpensive plasmonic metasurface for wide range of refractive index sensing","authors":"Vaswati Biswas and R Vijaya","doi":"10.1088/2515-7647/ad6963","DOIUrl":"https://doi.org/10.1088/2515-7647/ad6963","url":null,"abstract":"A plasmonic metasurface containing nanobumps of sub-wavelength feature size arranged in a hexagonal pattern on a flexible substrate and covered with a thin film of gold is investigated as a refractive index (RI) sensor. The chosen polymer patterns coated with gold aid in activating the surface plasmon polariton modes. Using numerical calculations, it is shown that this surface can exhibit plasmonic effect with extremely shallow pattern height of 92.5 nm and minimal thickness of 25 nm of gold over it. The excitation of the plasmonic modes is confirmed using electric field profiles calculated at the relevant wavelengths. As the surface is highly sensitive to changes in the cladding index, and the chosen design aids in exciting three plasmon modes that are suitably well-separated in wavelength, this surface can be used for an extremely wide range of RI sensing because each mode contributes uniquely to a different range of RI. The results establish that the metasurface is suitable for a variety of applications, including gas detection with a sensitivity of 633 nm RIU−1 using mode-1, identifying SARS-CoV-2 viral molecules with a sensitivity of 428 nm RIU−1 using mode-2 and 238 nm RIU−1 using mode-3, and discriminating between normal and diseased brain tissues in the cerebrospinal fluid in the high-index range using mode-3. The prototype metasurface is made using a cost-effective soft lithography technique using an economical master mould. The inexpensive technique of fabrication, use of very thin metal film, and wavelength of detection lying within the visible to near infrared range imply a low-cost sensor. The structural and optical characterization of the prototype validates the numerical study of the sample.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Image scanning microscopy reconstruction by autocorrelation inversion 通过自相关反演重建图像扫描显微镜

IF 3.8

Journal of Physics-Photonics Pub Date : 2024-08-06 DOI: 10.1088/2515-7647/ad68dd

Daniele Ancora, Alessandro Zunino, Giuseppe Vicidomini and Alvaro H Crevenna

{"title":"Image scanning microscopy reconstruction by autocorrelation inversion","authors":"Daniele Ancora, Alessandro Zunino, Giuseppe Vicidomini and Alvaro H Crevenna","doi":"10.1088/2515-7647/ad68dd","DOIUrl":"https://doi.org/10.1088/2515-7647/ad68dd","url":null,"abstract":"Confocal laser scanning microscopy (CLSM) stands out as one of the most widely used microscopy techniques thanks to its three-dimensional imaging capability and its sub-diffraction spatial resolution, achieved through the closure of a pinhole in front of a single-element detector. However, the pinhole also rejects useful photons, and beating the diffraction limit comes at the price of irremediably compromising the signal-to-noise ratio (SNR) of the data. Image scanning microscopy (ISM) emerged as the rational evolution of CLSM, exploiting a small array detector in place of the pinhole and the single-element detector. Each sensitive element is small enough to achieve sub-diffraction resolution through the confocal effect, but the size of the whole detector is large enough to guarantee excellent collection efficiency and SNR. However, the raw data produced by an ISM setup consists of a 4D dataset, which can be seen as a set of confocal-like images. Thus, fusing the dataset into a single super-resolved image requires a dedicated reconstruction algorithm. Conventional methods are multi-image deconvolution, which requires prior knowledge of the system point spread functions (PSFs), or adaptive pixel reassignment (APR), which is effective only on a limited range of experimental conditions. In this work, we describe and validate a novel concept for ISM image reconstruction based on autocorrelation inversion. We leverage unique properties of the autocorrelation to discard low-frequency components and maximize the resolution of the reconstructed image without any assumption on the image or any knowledge of the PSF. Our results push the quality of the ISM reconstruction beyond the level provided by APR and open new perspectives for multi-dimensional image processing.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0