Journal of the Optical Society of America A最新文献

{"title":"A Directional Region-Based Feature Point Matching Algorithm based on SURF","authors":"Qiangxian Huang, Tao Xiang, Zhihao Zhao, Kui Wu, Hongli Li, R. Cheng, Liansheng Zhang, Zhen-Ying Cheng","doi":"10.1364/josaa.501371","DOIUrl":"https://doi.org/10.1364/josaa.501371","url":null,"abstract":"","PeriodicalId":501620,"journal":{"name":"Journal of the Optical Society of America A","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138972970","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}

{"title":"Detecting topological index of randomly scattered V-point singularities using Stokes correlations","authors":"Akanksha Gautam, Gauri Arora, P. Senthilkumaran, and Rakesh Kumar Singh","doi":"10.1364/josaa.507782","DOIUrl":"https://doi.org/10.1364/josaa.507782","url":null,"abstract":"Topological defects in vector fields constitute polarization singularities that have numerous applications in classical and quantum optics. These beams are inhomogeneously polarized and are shown to self-heal under symmetric amplitude perturbations. Polarization singular beams are characterized using a singularity index that can be detected using Stokes polarimetry or other interferometric and diffraction approaches. However, the information about the singularity index is lost when these beams travel through random scattering media; this results in a spatially fluctuating polarization pattern known as polarization speckle. This paper proposes and experimentally demonstrates a new method to detect the topological index of these randomly scattered V-point singularities using higher-order Stokes correlations in a lensless condition. A detailed theoretical basis is developed, and the performance of the technique is demonstrated by retrieving the signature of polarization singularities with Poincaré–Hopf index <span><span style=\"color: inherit;\"><span><span><span style=\"margin-left: 0.167em; margin-right: 0.167em;\">|</span></span><span><span>η</span></span><span><span style=\"margin-left: 0.167em; margin-right: 0.167em;\">|</span></span><span style=\"margin-left: 0.333em; margin-right: 0.333em;\">=</span><span>1</span></span></span><script type=\"math/tex\">| {boldsymbol eta} | = 1</script></span> and <span><span style=\"color: inherit;\"><span><span><span style=\"margin-left: 0.167em; margin-right: 0.167em;\">|</span></span><span><span>η</span></span><span><span style=\"margin-left: 0.167em; margin-right: 0.167em;\">|</span></span><span style=\"margin-left: 0.333em; margin-right: 0.333em;\">=</span><span>2</span></span></span><script type=\"math/tex\">| {boldsymbol eta} | = 2</script></span>. We also demonstrate that by studying the intensity–intensity correlations of the polarization speckle, it is possible to differentiate between different vector beams having the same magnitude as the Poincaré–Hopf index.","PeriodicalId":501620,"journal":{"name":"Journal of the Optical Society of America A","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138716103","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}

{"title":"Universal angular-dispersion synthesizer","authors":"Layton A. Hall and Ayman F. Abouraddy","doi":"10.1364/josaa.506629","DOIUrl":"https://doi.org/10.1364/josaa.506629","url":null,"abstract":"We uncover a surprising gap in optics with regards to angular dispersion (AD). A systematic examination of pulsed optical field configurations classified according to their three lowest dispersion orders resulting from AD (the axial phase velocity, group velocity, and group-velocity dispersion) reveals that the majority of possible classes of fields have eluded optics thus far. This gap is due in part to the limited technical reach of the standard components that provide AD such as gratings and prisms, but due in part also to misconceptions regarding the set of physically admissible field configurations that can be accessed via AD. For example, it has long been thought that AD cannot yield normal group-velocity dispersion in free space. We introduce a “universal AD synthesizer”: a pulsed-beam shaper that produces a wavelength-dependent propagation angle with arbitrary spectral profile, thereby enabling access to all physically admissible field configurations realizable via AD. This universal AD synthesizer is a versatile tool for preparing pulsed optical fields for dispersion cancellation, optical signal processing, and nonlinear optics.","PeriodicalId":501620,"journal":{"name":"Journal of the Optical Society of America A","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138715855","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}

{"title":"Streamlines and topological transformation of modified vector Bessel–Gauss beams","authors":"Missael Sepulveda-Rios and Julio C. Gutiérrez-Vega","doi":"10.1364/josaa.509814","DOIUrl":"https://doi.org/10.1364/josaa.509814","url":null,"abstract":"We characterize the streamline patterns of the transverse electric (TE) and transverse magnetic (TM) modes of the vector-modified Bessel–Gauss (BG) beam, which is the Fourier-transformed version of the ordinary BG beam. We derive analytical expressions to approximate the streamline patterns produced by the superposition of TM and TE modes. An analysis of the effect on the streamlines of the vector BG beams produced by some polarization devices, e.g., linear retarders and spiral polarizers, is presented. Additionally, we study the geometrical phase induced by linear retarders into the TM mode of the field. This work contributes to the description and understanding of the vector structure of the focal field of Bessel–Gauss beams.","PeriodicalId":501620,"journal":{"name":"Journal of the Optical Society of America A","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138579013","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}

{"title":"DPENet: a dual-constrained physics-enhanced untrained neural network for lensless imaging","authors":"Zehua Wang, Shenghao Zheng, Zhihui Ding, Cheng Guo","doi":"10.1364/josaa.510147","DOIUrl":"https://doi.org/10.1364/josaa.510147","url":null,"abstract":"","PeriodicalId":501620,"journal":{"name":"Journal of the Optical Society of America A","volume":"3 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139006766","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}

{"title":"Numerical computation of temperature on steel and insulator with simulation compared to experimental data","authors":"Luc Levesque, Craig Williams","doi":"10.1364/josaa.502009","DOIUrl":"https://doi.org/10.1364/josaa.502009","url":null,"abstract":"","PeriodicalId":501620,"journal":{"name":"Journal of the Optical Society of America A","volume":"26 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139009616","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}

{"title":"Sinc method for generating and extending phase screens of atmospheric turbulence","authors":"Max Cubillos and Kevin Luna","doi":"10.1364/josaa.506711","DOIUrl":"https://doi.org/10.1364/josaa.506711","url":null,"abstract":"We present a method, based on sinc series approximation, for generating and extending phase screens of atmospheric turbulence in real time to arbitrary lengths. Unlike phase screen representations based on the Fourier series, the sinc approximation is naturally suited to problems on infinite domains and thus avoids the problem of artificial periodicity inherent in the Fourier series. In particular, phase screens generated using the sinc method have accurate non-periodic statistics throughout the computational domain. They can also be extended using a conditional probability distribution without having to deal with artifacts of periodicity. This is a crucial feature for long time-dependent simulations of dynamic turbulence that require very long phase screen realizations. Both the generation and extension methods take advantage of special structures inherent in the sinc approximation, leading to light memory footprints and fast computations based on the FFT. Numerical results demonstrate the accuracy of the sinc method, reproducing the correct ensemble averaged statistics as well as the sample statistics of single realizations. In other words, the sinc method preserves ergodicity when this is a feature of the turbulence model. We also verify the computational efficiency of the proposed methods.","PeriodicalId":501620,"journal":{"name":"Journal of the Optical Society of America A","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138557194","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}

{"title":"Calculation of the wave aberration of an axial bundle of rays","authors":"Jiří Novák and Antonín Mikš","doi":"10.1364/josaa.497492","DOIUrl":"https://doi.org/10.1364/josaa.497492","url":null,"abstract":"A differential equation is derived for the calculation of the wave aberration of an axial bundle of rays affected by spherical aberration. The solution of the derived equation is analyzed, and the influence of the radius of the reference sphere on the value of the wave aberration is presented. The approximate formula for wave aberration is obtained, which allows the splitting of the wave aberration into a part relative to an infinitely distant reference sphere and a part showing the dependence of the wave aberration on the radius of the reference sphere. Furthermore, the case of third-order and fifth-order spherical aberration is investigated, and the formulas for the calculation of the Strehl definition for the case of small aberrations are derived. The accuracy of the approximated formulas for the wave aberration is analyzed in an example.","PeriodicalId":501620,"journal":{"name":"Journal of the Optical Society of America A","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138566165","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}

{"title":"Spectral precision improvement with demagnifying spectral images in spectroscopic nanoscopy","authors":"Ki-Hee Song and Yang Zhang","doi":"10.1364/josaa.497634","DOIUrl":"https://doi.org/10.1364/josaa.497634","url":null,"abstract":"Spectroscopic nanoscopy (SN) has been recognized as a key functional imaging tool in cell biology and chemistry because it offers the unique capability to simultaneously obtain the spatial and spectral information for single molecules. However, it has an intrinsic issue in using the limited photon budget from single emitters divided into two imaging channels to concurrently acquire spatial and spectral images. Accordingly, this issue lowers the spatial localization and spectral precision. Although several techniques have been introduced to improve the spatial precision in SN, improving the spectral precision has been overlooked so far. Here we propose a method to improve the spectral precision by optically manipulating the width of the spectroscopic signatures using a demagnifier. We evaluate its performance using numerical simulations with systematic investigations of several underlying optimal parameters such as the demagnification factor and the integration width in the proposed configuration. We also present achievable spectral precision values with different signal and background levels. Compared to the existing SN system, the <span><span style=\"color: inherit;\"><span><span><span>3</span></span><span style=\"margin-left: 0.267em; margin-right: 0.267em;\">×</span></span></span><script type=\"math/tex\">{3} times</script></span> demagnifier-based configuration shows an approximate 35% improvement, from 2.9 nm to 1.9 nm, in the spectral precision at the 1000 photons signal level.","PeriodicalId":501620,"journal":{"name":"Journal of the Optical Society of America A","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138561028","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}

{"title":"Unbiased centroiding of point targets close to the Cramer Rao limit","authors":"G. Hechenblaikner","doi":"10.1364/JOSAA.507588","DOIUrl":"https://doi.org/10.1364/JOSAA.507588","url":null,"abstract":"Systematic errors affecting center-of-gravity (CoG) measurements may occur from coarse sampling of the point-spread-function (PSF) or from signal truncation at the boundaries of the region-of-interest (ROI). For small ROI and PSF widths, these effects are shown to become dominant, but this can be mitigated by introducing novel unbiased estimators that are largely free of systematic error and perform particularly well for low photon number. Analytical expressions for the estimator variances, comprising contributions from photon shot noise, random pixel noise and residual systematic error, are derived and verified by Monte Carlo simulations. The accuracy and computational speed of the unbiased estimators is compared to those of other common estimators, including iteratively weighted CoG, thresholded CoG, iterative least squares fitting, and two-dimensional Gaussian regression. Each estimator is optimized with respect to ROI size and PSF radius and its error compared to the theoretical limit defined by the Cramer Rao lower bound (CRLB). The unbiased estimator with full systematic error correction operating on a small ROI [3x3] emerges as one of the most accurate estimators while requiring significantly less computing effort than alternative algorithms.","PeriodicalId":501620,"journal":{"name":"Journal of the Optical Society of America A","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139358455","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}