{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,19]],"date-time":"2026-10-19T02:11:18Z","timestamp":1792375878547,"version":"4.4.0"},"reference-count":46,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2026,2,24]],"date-time":"2026-02-24T00:00:00Z","timestamp":1771891200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,2,24]],"date-time":"2026-02-24T00:00:00Z","timestamp":1771891200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Nanophotonics"],"published-print":{"date-parts":[[2026,3,16]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Spin\u2013orbit interaction (SOI) of tightly focused light in optical tweezers underpins diverse optomechanical applications and the interconversion of spin and orbital angular momentum. Here, we demonstrate that the transfer of the spin angular momentum of a tightly focused circularly polarized beam to an on\u2010axis birefringent particle can indirectly generate spin in an adjacent particle, leading to exotic rotational motion reminiscent of planetary trajectories. We demonstrate simultaneous rotation and revolution of birefringent liquid crystal (LC) particles by harvesting SOI, such that its two principal governing mechanisms\u2014the momentum\u2010dependent Pancharatnam\u2013Berry (PB) phase and the anisotropy\u2010induced PB phase\u2014become coupled. In our experiments, a centrally trapped LC particle in spherically aberrated optical tweezers spins under circularly polarized illumination, generating spin\u2010induced microfluidic flows that drive surrounding off\u2010axis LC particles into orbital motion. Simultaneously, interaction of the input helicity with the centrally trapped particle induces spin\u2010to\u2010spin conversion through extrinsic SOI. The helicity thereby generated indirectly then couples to the orbiting particles, imparting an additional rotation whose direction is determined by the birefringence of the central particle. A Mueller matrix model that incorporates tight focusing and scattering quantitatively explains these observations. Thus, SOI coupled with microfluidic effects establishes exotic rotational optomechanics and microswitch applications.<\/jats:p>","DOI":"10.1002\/nap2.70034","type":"journal-article","created":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T03:35:38Z","timestamp":1774236938000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Harvesting the Spin\u2013Orbit Interaction of Light to Generate Helicity\u2010Dependent Complex Rotational Motion in Optically Trapped Mesoscopic Matter"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8419-3804","authenticated-orcid":false,"given":"Ram Nandan","family":"Kumar","sequence":"first","affiliation":[{"name":"Structured Light Laboratory, School of Physics University of the Witwatersrand  Johannesburg South Africa"},{"name":"Department of Physical Sciences Indian Institute of Science Education and Research Kolkata  Mohanpur West Bengal India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeeban Kumar","family":"Nayak","sequence":"additional","affiliation":[{"name":"Department of Physical Sciences Indian Institute of Science Education and Research Kolkata  Mohanpur West Bengal India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Subhasish Dutta","family":"Gupta","sequence":"additional","affiliation":[{"name":"Tata Institute of Fundamental Research  Hyderabad Telangana India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nirmalya","family":"Ghosh","sequence":"additional","affiliation":[{"name":"Department of Physical Sciences Indian Institute of Science Education and Research Kolkata  Mohanpur West Bengal India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2443-9125","authenticated-orcid":false,"given":"Ayan","family":"Banerjee","sequence":"additional","affiliation":[{"name":"Department of Physical Sciences Indian Institute of Science Education and Research Kolkata  Mohanpur West Bengal 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