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arXiv · 2302.00241

Controlled longitudinal spin-orbit separation of complex vector modes

Xiao-Bo Hu·Bo Zhao·Rui-Pin Chen·Carmelo Rosales-Guzmán
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Abstract

Complex vector modes, entangled in spin and orbital angular momentum, are opening burgeoning opportunities for a wide variety of applications. Importantly, the flexible manipulation the various properties of such beams will pave the way to novel applications. As such, in this manuscript, we demonstrate a longitudinal spin-orbit 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 of CAGVV mode undergo a spin-orbit separation along the propagation direction namely, while one polarisation component, focuses at a specific plane, the other focuses at a different plane. Such spin-orbit separation, which we demonstrated by numerical simulations and corroborated experimentally, can be adjusted on-demand by simply changing the initial parameters of CAGVV modes. Our findings will be of great relevance, for example in optical tweezers, to manipulate micro- or nano-particles at two different parallel planes.

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Xiao-Bo Hu, Bo Zhao, Rui-Pin Chen, Carmelo Rosales-Guzmán. 2023-02-01. Controlled longitudinal spin-orbit separation of complex vector modes. https://doi.org/10.1364/ol.486699

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