Open AccessGiant Goos-Hänchen shift induced by bounded states in optical PT-symmetric bilayer structures
Author(s) -
Yanyan Cao,
Yangyang Fu,
Qingjia Zhou,
Yadong Xu,
Lei Gao,
Huanyang Chen
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.007857
Subject(s) - physics , bilayer , optics , amplitude , bounded function , photonics , condensed matter physics , mathematical analysis , mathematics , chemistry , biochemistry , membrane
Goos-Hänchen (GH) effect is a fundamental phenomenon in optics. Here we demonstrate theoretically that the surface modes at Parity-time (PT) symmetric interfaces, can induce a giant GH shift at a specific incident angle. It is found that the amplitude of the GH shift can be tuned by adjusting the thickness of the bilayer, and as the thickness grows, its maximum value can go to infinity in theory. The physical mechanism behind this interesting feature is that the surface modes at PT interfaces are quasi-bound states in continuum (BICs), which lead to rapid variation in the phase of the scattered waves. Our work enriches the previous studies about GH effect in PT bilayer structures and provides a way in turn to explore the BICs in non-Hermitian photonic systems.