Topological Spaser

Jhih Sheng Wu*, Vadym Apalkov, Mark I. Stockman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


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 K and K′ valleys, which carry the opposite topological charges, ±1, and are described by a two-dimensional E′ representation of the D3h 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, and biomedical detection and sensing with chirality resolution.

Original languageEnglish
Article number017701
JournalPhysical Review Letters
Issue number1
StatePublished - 6 Jan 2020

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