Study of a High-Index Dielectric Non-Hermitian Metasurface and Its Application in Holograms.
ACS Omega
; 7(49): 44743-44749, 2022 Dec 13.
Article
em En
| MEDLINE
| ID: mdl-36530222
ABSTRACT
We demonstrate that a high-index dielectric Si metasurface with a designed chiral unit structure possesses an exceptional point (EP) when it is described by a non-Hermitian Hamiltonian associated with the transmission matrix. By encircling any path in the parameter space around the EP, topologically protected 2π-phase accumulation occurs. These typical non-Hermitian properties are ascribed to complex scattering phenomena related to the coupling between electric and magnetic dipolar modes from the high-index dielectric Si metasurface. The topologically guaranteed entire 2π-phase accumulation and chiral distinction around the EP open up many promising possibilities in nanophotonic device designing; for instance, phase-only and polarization multiplexing holograms are realized in this work.
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MEDLINE
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2022
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Article