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Spectral separation of optical spin based on antisymmetric Fano resonances
Cited 17 time in
Web of Science
Cited 17 time in Scopus
- Authors
- Issue Date
- 2015-11
- Publisher
- Nature Publishing Group
- Citation
- Scientific Reports, Vol.5, p. 16585
- Abstract
- We propose a route to the spectral separation of optical spin angular momentum based on spin-dependent Fano resonances with antisymmetric spectral profiles. By developing a spin-form coupled mode theory for chiral materials, the origin of antisymmetric Fano spectra is clarified in terms of the opposite temporal phase shift for each spin, which is the result of counter-rotating spin eigenvectors. An analytical expression of a spin-density Fano parameter is derived to enable quantitative analysis of the Fano-induced spin separation in the spectral domain. As an application, we demonstrate optical spin switching utilizing the extreme spectral sensitivity of the spin-density reversal. Our result paves a path toward the conservative spectral separation of spins without any need of the magneto-optical effect or circular dichroism, achieving excellent purity in spin density superior to conventional approaches based on circular dichroism.
- ISSN
- 2045-2322
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Related Researcher
- College of Engineering
- Department of Electrical and Computer Engineering
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