Topological Spaser in a Non-uniform Field
ORAL
Abstract
We propose a nanospaser made of an achiral plasmonic-metal nanodisc and a two-dimensional
chiral gain medium, e.g., a monolayer transition-metal dichalcogenide (TMDC). Such a gain medium can pumped by circularly-polarized radiation into a valley-polarized (topologically-charged) state where the population-inversion of the K and K′valleys may be different. Each valley's population inversion independently feeds a chiral spasing mode of the nanodisk. There are two such modes that carry opposite topological charges; they do not compete with or cross-talk to each other, and are highly independent. The local fields of these modes rotate in time in opposite directions and are highly nonuniform in space.
chiral gain medium, e.g., a monolayer transition-metal dichalcogenide (TMDC). Such a gain medium can pumped by circularly-polarized radiation into a valley-polarized (topologically-charged) state where the population-inversion of the K and K′valleys may be different. Each valley's population inversion independently feeds a chiral spasing mode of the nanodisk. There are two such modes that carry opposite topological charges; they do not compete with or cross-talk to each other, and are highly independent. The local fields of these modes rotate in time in opposite directions and are highly nonuniform in space.
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Presenters
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Rupesh Ghimire
Department of Physics and Center of Nano Optics, Georgia State University
Authors
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Rupesh Ghimire
Department of Physics and Center of Nano Optics, Georgia State University
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Jhih-Sheng Wu
Department of Physics and Center of Nano Optics, Georgia State University
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Vadym Apalkov
Department of Physics and Center of Nano Optics, Georgia State University, Georgia State University
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Mark I Stockman
Department of Physics and Center of Nano Optics, Georgia State University, Georgia State University