Topological Spaser
Jhih-Sheng Wu, Vadym Apalkov, Mark I. Stockman

TL;DR
This paper introduces a theoretical topological spaser that generates chiral surface plasmon modes with topological charges, exhibiting bistability and potential for ultrafast optical memory and processing.
Contribution
It presents the first theoretical design of a topological spaser with chiral modes and bistability, advancing nanoplasmonic and topological photonics.
Findings
Supports two mutually time-reversed chiral modes with opposite topological charges
Exhibits bistability due to mode competition, enabling spontaneous symmetry breaking
Potential applications in ultrafast all-optical memory and information processing
Abstract
We theoretically introduce a topological spaser, which consists of a hexagonal array of plasmonic metal nanoshells containing an achiral gain medium in their cores. Such a spaser can generate two mutually time-reversed chiral surface plasmon modes in the - and -valleys, which carry the opposite topological charges, , and are described by a two-dimensional representation of the point symmetry group. Due to the mode competition, this spaser exhibits a bistability: only one of these two modes generates, which is a spontaneous symmetry breaking. Such a spaser can be used for an ultrafast all-optical memory and information processing
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