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Lett."],"published-print":{"date-parts":[[2023,5,15]]},"abstract":"<jats:p>Complex vector modes are opening burgeoning opportunities for a wide variety of applications and therefore the flexible manipulation of their various properties has become a topic of late. As such, in this Letter, we demonstrate a longitudinal spin\u2013orbit separation of complex vector modes propagating in free space. To achieve this, we employed the recently demonstrated circular Airy Gaussian vortex vector (CAGVV) modes, which feature a self-focusing property. More precisely, by properly manipulating the intrinsic parameters of CAGVV modes, the strong coupling between the two constituting orthogonal components can be engineered to undergo a spin\u2013orbit separation along the propagation direction. In other words, while one polarization component focuses at one plane, the other focuses at a different plane. Such spin\u2013orbit separation, which we demonstrated by numerical simulations and corroborated experimentally, can be adjusted on-demand by simply changing the initial parameters of the CAGVV mode. Our findings will be of great relevance in applications such as optical tweezers, to manipulate micro- or nano-particles at two different parallel planes.<\/jats:p>","DOI":"10.1364\/ol.486699","type":"journal-article","created":{"date-parts":[[2023,4,14]],"date-time":"2023-04-14T08:01:43Z","timestamp":1681459303000},"page":"2728","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Tunable longitudinal spin\u2013orbit separation of complex vector modes"],"prefix":"10.1364","volume":"48","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9928-6878","authenticated-orcid":true,"given":"Xiao-Bo","family":"Hu","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03893we55","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bo","family":"Zhao","sequence":"additional","affiliation":[{"name":"Harbin University of Science and Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui-Pin","family":"Chen","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03893we55","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0321-0877","authenticated-orcid":true,"given":"Carmelo","family":"Rosales-Guzm\u00e1n","sequence":"additional","affiliation":[{"name":"Centro de Investigaciones en \u00d3ptica, A.C."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2023,5,12]]},"reference":[{"key":"ol-48-10-2728-R1","doi-asserted-by":"publisher","first-page":"013001","DOI":"10.1088\/2040-8978\/19\/1\/013001","volume":"19","author":"Rubinsztein-Dunlop","year":"2017","journal-title":"J. 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