{"title":"Spin dynamics and torque-mediated relaxation mechanisms of a nonbirefringent optomechanical microrotor in vacuum.","authors":"Jian Wu, Wenfeng Fan, Qi Zheng, Wei Quan","doi":"10.1364/OL.605537","DOIUrl":null,"url":null,"abstract":"<p><p>The vacuum-levitated microrotor has emerged as a versatile strategy for nondestructive detection and precision measurement, which always relies on spin angular momentum transfer from circularly polarized light. Here, we present a deflection optical torque introduction scheme that is independent of beam polarization for a nonbirefringent microparticle. Without active feedback cooling, the stably trapped pressure level achieved is one order of magnitude lower than that attainable with the conventional levitated microrotor method, reaching down to 1.6 × 10<sup>-4</sup> mbar, and a maximum rotational frequency of 0.48 MHz is obtained. From rotation relaxation measurements, the input optical torque is inferred to be (1.384 ± 0.005) × 10<sup>-17</sup> N·m. This work establishes a clean, stable high-speed rotating platform under vacuum conditions, paving the way for ultrasensitive torque measurements and enabling potential applications in optically levitated gyroscopes.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"51 20","pages":"5758-5761"},"PeriodicalIF":3.3000,"publicationDate":"2026-10-15","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.605537","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2026/9/21 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
The vacuum-levitated microrotor has emerged as a versatile strategy for nondestructive detection and precision measurement, which always relies on spin angular momentum transfer from circularly polarized light. Here, we present a deflection optical torque introduction scheme that is independent of beam polarization for a nonbirefringent microparticle. Without active feedback cooling, the stably trapped pressure level achieved is one order of magnitude lower than that attainable with the conventional levitated microrotor method, reaching down to 1.6 × 10-4 mbar, and a maximum rotational frequency of 0.48 MHz is obtained. From rotation relaxation measurements, the input optical torque is inferred to be (1.384 ± 0.005) × 10-17 N·m. This work establishes a clean, stable high-speed rotating platform under vacuum conditions, paving the way for ultrasensitive torque measurements and enabling potential applications in optically levitated gyroscopes.
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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