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나노 구조 물리 연구단
나노구조물리 연구단
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Observation of an exceptional point in a non-Hermitian metasurface

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Title
Observation of an exceptional point in a non-Hermitian metasurface
Author(s)
Sang Hyun Park; Sung-Gyu Lee; Soojeong Baek; Taewoo Ha; Sanghyub Lee; Bumki Min; Shuang Zhang; Mark Lawrence; Teun-Teun Kim
Publication Date
2020-02
Journal
NANOPHOTONICS, v.9, no.5, pp.1031 - 1039
Publisher
WALTER DE GRUYTER GMBH
Abstract
© 2020 Mark Lawrence, Teun-Teun Kim et al., published by De Gruyter, Berlin/Boston 2020.Exceptional points (EPs), also known as non-Hermitian degeneracies, have been observed in parity-time symmetric metasurfaces as parity-time symmetry breaking points. However, the parity-time symmetry condition puts constraints on the metasurface parameter space, excluding the full examination of unique properties that stem from an EP. Here, we thus design a general non-Hermitian metasurface with a unit cell containing two orthogonally oriented split-ring resonators (SRRs) with overlapping resonance but different scattering rates and radiation efficiencies. Such a design grants us full access to the parameter space around the EP. The parameter space around the EP is first examined by varying the incident radiation frequency and coupling between SRRs. We further demonstrate that the EP is also observable by varying the incident radiation frequency along with the incident angle. Through both methods, we validate the existence of an EP by observing unique level crossing behavior, eigenstate swapping under encirclement, and asymmetric transmission of circularly polarized light
URI
https://pr.ibs.re.kr/handle/8788114/7238
ISSN
2192-8606
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
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