Simultaneous observation of forward and inverse spin-Hall effects in a hybridised spin-locking plasmonic crystal

Jeeban Kumar Nayak; Harley Suchiang; Subir Kumar Ray; Ayan Banerjee; Subhasish Dutta Gupta; Nirmalya Ghosh

doi:10.1117/12.2647863

15 March 2023 Simultaneous observation of forward and inverse spin-Hall effects in a hybridised spin-locking plasmonic crystal

Jeeban Kumar Nayak, Harley Suchiang, Subir Kumar Ray, Ayan Banerjee, Subhasish Dutta Gupta, Nirmalya Ghosh

Author Affiliations +

Proceedings Volume 12436, Complex Light and Optical Forces XVII; 1243604 (2023) https://doi.org/10.1117/12.2647863
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Coupling and mutual influence of spin angular momentum (SAM), orbital angular momentum (OAM), and linear momentum of light have led to a number of photonic spin-orbit interaction (SOI) effects in various light-matter interactions[1-2]. These have provided new insights on the universal SOI phenomena and also have opened up a new paradigm of spin-orbit photonic devices. Despite the considerable promises of these spin-orbit photonic effects, there remain several outstanding challenges to address. Besides the enhancement of these weak SOI effects, developing novel experimental systems for efficient probing, interpreting their underlying physics and manifestation are highly sought after in the context of developing photonic SOI based technologies. Among the various SOI effects, photonic spin-momentum locking has attracted particular attention due to its profound origin and potential device applications. Usually the spin-directional coupling is obtained in spatially inhomogeneous anisotropic metamaterials or metasurfaces through appropriate tailoring of the geometric phase gradient leading to the breaking of the spatial inversion symmetry. The photonic spin-momentum locking has also been demonstrated in planar interfaces without any structures. In this scenario, the spin-directional coupling of the transversly propagating surface waves or waveguide modes arises due to the presence of transverse spin angular momentum (SAM) of the evanescent waves.

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Jeeban Kumar Nayak, Harley Suchiang, Subir Kumar Ray, Ayan Banerjee, Subhasish Dutta Gupta, and Nirmalya Ghosh "Simultaneous observation of forward and inverse spin-Hall effects in a hybridised spin-locking plasmonic crystal", Proc. SPIE 12436, Complex Light and Optical Forces XVII, 1243604 (15 March 2023); https://doi.org/10.1117/12.2647863

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