Vectorial spin-orbital Hall effect of light upon tight focusing and its experimental observation in azopolymer films
빛의 벡터 자선 궤도 홀 효과 및 짝질소 중합체 박막에서의 실험 관찰
Efecto Hall de la órbita de giro vectorial de la luz y su observación experimental en películas de polímeros azoicos
Effet Hall orbital de spin vectoriel de la lumière et son observation expérimentale dans des films polymères azoïques
векторный спин - орбитальный эффект Холла света и его экспериментальное наблюдение в пленке азополимеров
Alexey Porfirev ¹, Svetlana Khonina ¹, Andrey Ustinov ¹, Nikolay Ivliev ¹, Ilya Golub ²
¹ Image Processing Systems Institute of RAS—Branch of the FSRC "Crystallography and Photonics" RAS, Samara, 443001; Russia
² School of Advanced Technology, Algonquin College, Ottawa, Ontario K2G 1V8, Canada
Opto-Electronic Science, 20 July 2023

Hall effect of light is a result of symmetry breaking in spin and/or orbital angular momentum (OAM) possessing optical system and is caused by e.g. refractive index gradient/interface between media or focusing of a spatially asymmetrical beam, similar to the electric field breaking the symmetry in spin Hall effect for electrons.

The angular momentum (AM) conservation law in the ensuing asymmetric system dictates redistribution of spin and orbital angular momentum, and is manifested in spin-orbit, orbit-orbit, and orbit-spin conversions and reorganization, i.e. spin-orbit and orbit-orbit interaction. This AM restructuring in turn requires shifts of the barycenter of the electric field of light.

In the present study we show, both analytically and by numerical simulation, how different electric field components are displaced upon tight focusing of an asymmetric light beam having OAM and spin. The relation between field components shifts and the AM components shifts/redistribution is presented too. Moreover, we experimentally demonstrate, for the first time, to the best of our knowledge, the spin-orbit Hall effect of light upon tight focusing in free space.

This is achieved using azopolymers as a media detecting longitudinal orzcomponent of the electrical field of light. These findings elucidate the Hall effect of light and may broaden the spectrum of its applications.
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