Spin-dependent phenomena at chiral temporal interfaces

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2023-07-01

Department

Department of Electronics and Nanoengineering

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Language

en

Pages

9

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Nanophotonics, Volume 12, issue 14, pp. 2881-2889

Abstract

Temporally varying electromagnetic media have been extensively investigated recently to unveil new means for controlling light. However, spin-dependent phenomena in such media have not been explored thoroughly. Here, we reveal the existence of spin-dependent phenomena at a temporal interface between chiral and dielectric media. In particular, we show theoretically and numerically that due to the material discontinuity in time, linearly polarized light is split into forward-propagating right-handed and left-handed circularly polarized waves having different angular frequencies and the same phase velocities. This salient effect allows complete temporal separation of the two spin states of light with high efficiency. In addition, a phenomenon of spin-dependent gain/loss is observed. Furthermore, we show that when the dielectric medium is switched back to the original chiral medium, the right- and left-handed circularly polarized light waves (with different angular frequencies) merge to form a linearly polarized wave. Our findings extend spin-dependent interactions of light from space to space-time.

Description

Funding Information: Research funding: This work was supported by the Academy of Finland under grant 330260. Publisher Copyright: © 2023 the author(s), published by De Gruyter, Berlin/Boston 2023.

Keywords

spin-dependent phenomena, switching bianisotropy, switching chirality, temporal interface

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DOI

10.1515/nanoph-2022-0805

Citation

Mostafa, M H M, Mirmoosa, M S & Tretyakov, S A 2023, ' Spin-dependent phenomena at chiral temporal interfaces ', Nanophotonics, vol. 12, no. 14, pp. 2881-2889 . https://doi.org/10.1515/nanoph-2022-0805

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https://urn.fi/URN:NBN:fi:aalto-202304192756

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[article-cris] Sähkötekniikan korkeakoulu / ELEC