Chiral Quasi-Bound States in the Continuum

Adam Overvig, Nanfang Yu, Andrea Alù

Research output: Contribution to journalArticlepeer-review

225 Scopus citations

Abstract

Quasi-bound states in the continuum (QBICs) are Fano resonant states with long optical lifetimes controlled by symmetry-breaking perturbations. While conventional Fano responses are limited to linear polarizations and do not support tailored phase control, here we introduce QBICs born of chiral perturbations that encode arbitrary elliptical polarization states and enable geometric phase engineering. We thereby design metasurfaces with ultrasharp spectral features that shape the impinging wave front with near-unity efficiency. Our findings extend Fano resonances beyond their conventional limits, opening opportunities for nanophotonics, classical and quantum optics, and acoustics.

Original languageEnglish
Article number073001
JournalPhysical Review Letters
Volume126
Issue number7
DOIs
StatePublished - 17 Feb 2021

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