TY - JOUR
T1 - Chiral Quasi-Bound States in the Continuum
AU - Overvig, Adam
AU - Yu, Nanfang
AU - Alù, Andrea
N1 - Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/2/17
Y1 - 2021/2/17
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.126.073001
DO - 10.1103/PhysRevLett.126.073001
M3 - Article
C2 - 33666456
AN - SCOPUS:85102411120
SN - 0031-9007
VL - 126
JO - Physical Review Letters
JF - Physical Review Letters
IS - 7
M1 - 073001
ER -