Journal of Optics最新文献_第7页

Optimizing the temporal and spatial resolutions and light throughput of Fresnel incoherent correlation holography in the framework of coded aperture imaging 在编码孔径成像框架内优化菲涅尔非相干全息技术的时空分辨率和光吞吐量

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-02-14 DOI: 10.1088/2040-8986/ad2620

Francis Gracy Arockiaraj, Agnes Pristy Ignatius Xavier, Shivasubramanian Gopinath, Aravind Simon John Francis Rajeswary, Saulius Juodkazis, Vijayakumar Anand

{"title":"Optimizing the temporal and spatial resolutions and light throughput of Fresnel incoherent correlation holography in the framework of coded aperture imaging","authors":"Francis Gracy Arockiaraj, Agnes Pristy Ignatius Xavier, Shivasubramanian Gopinath, Aravind Simon John Francis Rajeswary, Saulius Juodkazis, Vijayakumar Anand","doi":"10.1088/2040-8986/ad2620","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2620","url":null,"abstract":"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, and signal-to-noise ratio (SNR), are lower than those of direct imaging systems. Different techniques were developed by researchers around the world to improve the imaging characteristics of FINCH while retaining the inherent higher lateral resolution of FINCH. However, most of the solutions developed to improve FINCH presented additional challenges. In this study, we optimized FINCH in the framework of coded aperture imaging. Two recently developed computational methods, such as transport of amplitude into phase based on the Gerchberg Saxton algorithm and Lucy–Richardson–Rosen algorithm, were applied to improve light throughput and image reconstruction, respectively. The above implementation improved the axial resolution, temporal resolution, and SNR of FINCH and moved them closer to those of direct imaging while retaining the high lateral resolution. A point spread function (PSF) engineering technique has been implemented to prevent the low lateral resolution problem associated with the PSF recorded using pinholes with a large diameter. We believe that the above developments are beyond the state-of-the-art of existing FINCH-scopes.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"68 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140002501","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

Terahertz bi-functional polarization converter based on interference mechanism supported by diatomic metasurfaces 基于二原子元表面支持的干涉机制的太赫兹双功能偏振转换器

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-02-08 DOI: 10.1088/2040-8986/ad247c

Hui Li, Wenhui Xu, Hang Xu, Chunyu Song, Qi Tan, Jianquan Yao

{"title":"Terahertz bi-functional polarization converter based on interference mechanism supported by diatomic metasurfaces","authors":"Hui Li, Wenhui Xu, Hang Xu, Chunyu Song, Qi Tan, Jianquan Yao","doi":"10.1088/2040-8986/ad247c","DOIUrl":"https://doi.org/10.1088/2040-8986/ad247c","url":null,"abstract":"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 propose and design a single-layer diatomic all-dielectric metasurface working in the terahertz band, which can efficiently realize bi-functional polarization switching according to the Jones matrix. Such a meta-platform is assembled from two anisotropic silicon pillars with carefully optimized lateral dimensions and in-plane twist angles. Benefiting from the flexible assembly of half-wave plate and quarter-wave plate, the polarization states generated by the constructed metasurfaces in the transmission mode can be arbitrarily tailored. The feasibility of this diatomic metasurface is further validated by a broadband near-field imaging device, paving the way for broader system applications in cryptographic imaging, data storage, and chiral sensing.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"27 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765100","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

Fourier-transform-only method for random phase shifting interferometry 随机移相干涉测量的纯傅里叶变换方法

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-02-08 DOI: 10.1088/2040-8986/ad237c

Alperen Saltik, Sueda Saylan, Onur Tokel

{"title":"Fourier-transform-only method for random phase shifting interferometry","authors":"Alperen Saltik, Sueda Saylan, Onur Tokel","doi":"10.1088/2040-8986/ad237c","DOIUrl":"https://doi.org/10.1088/2040-8986/ad237c","url":null,"abstract":"An accurate and computationally simple phase shifting interferometry (PSI) method is developed to reconstruct phase maps without <italic toggle=\"yes\">a priori</italic> 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 only Fourier transform (FT). With spatial FT analysis, randomly phase-shifted data is reordered to allow performing temporal FT on the intensity, which is a function of the phase shift. Since the entire process, including order analysis and phase calculation, is based only on Fourier analysis, it is rapid, easy to implement, and addresses general sources of error. The method exhibits high performance in experiments containing random phase shifts. Moreover, simulations incorporating common experimental error sources such as random intensity noise, intensity harmonics, and phase shift errors demonstrate that the proposed method performs as good as or better than the state-of-the-art phase reconstruction techniques in terms of accuracy and time.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"7 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765174","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 comparative study of coherent and incoherent drives in a four-level quantum dot–based spaser 基于四级量子点的激光器中相干和非相干驱动的比较研究

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-02-05 DOI: 10.1088/2040-8986/ad21dc

Ankit Purohit, Akhilesh Kumar Mishra

{"title":"A comparative study of coherent and incoherent drives in a four-level quantum dot–based spaser","authors":"Ankit Purohit, Akhilesh Kumar Mishra","doi":"10.1088/2040-8986/ad21dc","DOIUrl":"https://doi.org/10.1088/2040-8986/ad21dc","url":null,"abstract":"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 for the two pumping scenarios. We provide a detailed analytical expression for the steady state and demonstrate that the incoherent pump is more suitable for the continuous spaser mode. The reason is better understood by studying the temporal evolution of the number of LSPs <inline-formula>\u0000<tex-math><?CDATA $left( {{N_n}} right)$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mfenced close=\")\" open=\"(\"><mml:mrow><mml:mrow><mml:msub><mml:mi>N</mml:mi><mml:mi>n</mml:mi></mml:msub></mml:mrow></mml:mrow></mml:mfenced></mml:math>\u0000<inline-graphic xlink:href=\"joptad21dcieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, where the LSP oscillation starts earlier for an incoherent drive and relaxes to a steady state with a large value of <inline-formula>\u0000<tex-math><?CDATA ${N_n}$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:msub><mml:mi>N</mml:mi><mml:mi>n</mml:mi></mml:msub></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"joptad21dcieqn2.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. At a large pump rate, the spaser curve shows saturation. In addition, we have found that the resonance peak of the spaser field is independent of coherent and incoherent pumping, whereas the peak amplitude of the field depends on the pump rate.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"20 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765178","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

Feasibility analysis of modulation formats in different seawater types and practical implementation on underwater optical communication testbed 不同海水类型中调制格式的可行性分析以及在水下光通信试验平台上的实际应用

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-01-06 DOI: 10.1007/s12596-023-01494-2

Shreyas Jain, B. C. D. Devappa, Kalyani Pawar, A. V. Murthy

引用次数: 0

Impact of propagation losses on photon-pair generation in silicon 传播损耗对硅中光子对生成的影响

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-01-04 DOI: 10.1088/2040-8986/ad1b11

Joyee Ghosh, Shivani Sharma, Vivek Venkataraman

{"title":"Impact of propagation losses on photon-pair generation in silicon","authors":"Joyee Ghosh, Shivani Sharma, Vivek Venkataraman","doi":"10.1088/2040-8986/ad1b11","DOIUrl":"https://doi.org/10.1088/2040-8986/ad1b11","url":null,"abstract":"\u0000 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 multiphoton generation, with a corresponding trade-off for the source brightness. Silicon nanowaveguides are shown to be capable of generating highly correlated paired photons with coincidental-to-accidental ratio (CAR) as high as ∽3400 and spectral brightness 2.8×105 pairs/s/GHz/mW, even in the presence of linear propagation loss of 1 dB/cm and nonlinear losses (two-photon absorption (TPA) and free-carrier absorption (FCA)), over a length of 1-cm with an input pump power of 1 mW. Loss and the corresponding Langevin noise are modeled using distributed beam splitters along the waveguide length to encapsulate the phenomenological coupling to the background reservoir (vacuum fluctuations). The proposed numerical model is more general compared to previous analytical models, particularly for including dispersion and wavelength-dependent losses, and more accurate for noise estimation in the high-photon-flux regime such as optical parametric amplifiers and squeezed state generation.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"59 12","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139386790","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 deep learning-based car accident detection approach in video-based traffic surveillance 基于深度学习的交通监控视频中的车祸检测方法

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-01-03 DOI: 10.1007/s12596-023-01581-4

Xinyu Wu, Tingting Li

引用次数: 0

Roadmap on optical sensors. 光学传感器路线图。

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-01-01 Epub Date: 2023-12-18 DOI: 10.1088/2040-8986/ad0e85

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 Diem

{"title":"Roadmap on optical sensors.","authors":"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 Diem","doi":"10.1088/2040-8986/ad0e85","DOIUrl":"10.1088/2040-8986/ad0e85","url":null,"abstract":"<p><p>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 to the design and functioning of an optical sensor for a particular application requires intimate knowledge of the optical, material, and environmental properties that can affect its performance. This roadmap on optical sensors addresses different technologies and application areas. It is constituted by twelve contributions authored by world-leading experts, providing insight into the current state-of-the-art and the challenges their respective fields face. Two articles address the area of optical fibre sensors, encompassing both conventional and specialty optical fibres. Several other articles are dedicated to laser-based sensors, micro- and nano-engineered sensors, whispering-gallery mode and plasmonic sensors. The use of optical sensors in chemical, biological and biomedical areas is discussed in some other papers. Different approaches required to satisfy applications at visible, infrared and THz spectral regions are also discussed.</p>","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"26 1","pages":"013001"},"PeriodicalIF":2.1,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10726224/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138805329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optical solitons in cascaded systems using the $$varPhi ^{6}$$-model expansion algorithm 使用$$varPhi ^{6}$$模型扩展算法的级联系统中的光孤子

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2023-12-31 DOI: 10.1007/s12596-023-01547-6

Salman A. AlQahtani, R. Shohib

引用次数: 0

Multifunctional optical logic device based on nanoscale rectangular ring resonator 基于纳米级矩形环谐振器的多功能光学逻辑器件

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2023-12-29 DOI: 10.1088/2040-8986/ad13b0

Junxiong Chai, Yiyuan Xie, Jing Tan, Xiao Jiang, Yan Chen

{"title":"Multifunctional optical logic device based on nanoscale rectangular ring resonator","authors":"Junxiong Chai, Yiyuan Xie, Jing Tan, Xiao Jiang, Yan Chen","doi":"10.1088/2040-8986/ad13b0","DOIUrl":"https://doi.org/10.1088/2040-8986/ad13b0","url":null,"abstract":"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 theory. The finite-difference time-domain simulation results reveal that multiple logic functions can be implemented with the aid of the wavelength division multiplexing technique at different output ports. Specifically, all seven basic types of logic gates, half-adder, half-subtractor, and 2*4 decoder can be implemented by monitoring the transmission of through and drop ports at different wavelengths. More importantly, among these functions, six logic gates (OR, XNOR, NAND, NOR, XOR, and AND) and half-adder functions can be performed simultaneously; the NOT logic operation is performed with controllable output ports and selectable working wavelengths; the half-subtractor and 2*4 decoder functions can be operated simultaneously. The proposed logic device is characterized by a small area overhead, multifunctionality, fast response time, and ultrahigh-speed information processing. It may potentially be applied in on-chip universal and parallel photonic computing units.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"12 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139092545","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