{"title":"Photonic spin-Hall effect at the nonparaxial focus of vortex beams.","authors":"Nitish Kumar, Nirmal K Viswanathan","doi":"10.1364/OL.569924","DOIUrl":null,"url":null,"abstract":"<p><p>The spin-dependent transverse deflection of a light beam's trajectory, due to symmetry breaking of its intrinsic angular momentum structure, is known as the photonic spin Hall effect (PSHE). We propose and demonstrate an optical retroreflection scheme to measure the PSHE at the nonparaxial focus of linearly polarized vortex beam. Symmetry breaking due to the vortex phase structure leads to the PSHE even at the focal plane, which is measured in the far-field upon retroreflection by a multilayer dielectric mirror. Overall, the complex field components, with radial and azimuthal variation of the phase and polarization, results in polarization singularities, which directly relate to the PSHE. These spatially separated topological sub-wavelength markers will be useful in various metrological applications.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 20","pages":"6281-6284"},"PeriodicalIF":3.3000,"publicationDate":"2025-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1364/OL.569924","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
The spin-dependent transverse deflection of a light beam's trajectory, due to symmetry breaking of its intrinsic angular momentum structure, is known as the photonic spin Hall effect (PSHE). We propose and demonstrate an optical retroreflection scheme to measure the PSHE at the nonparaxial focus of linearly polarized vortex beam. Symmetry breaking due to the vortex phase structure leads to the PSHE even at the focal plane, which is measured in the far-field upon retroreflection by a multilayer dielectric mirror. Overall, the complex field components, with radial and azimuthal variation of the phase and polarization, results in polarization singularities, which directly relate to the PSHE. These spatially separated topological sub-wavelength markers will be useful in various metrological applications.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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