Parity-time-symmetry breaking in double-slab surface-plasmon-polariton waveguidesopen access
- Authors
- Choi, Youngsun; Hong, Jong-Kyun; Cho, Jin-Ho; Lee, Kwang-Geol; Yoon, Jae Woong; Song, Seok Ho
- Issue Date
- May-2015
- Publisher
- OPTICAL SOC AMER
- Citation
- OPTICS EXPRESS, v.23, no.9, pp.11783 - 11789
- Indexed
- SCIE
SCOPUS
- Journal Title
- OPTICS EXPRESS
- Volume
- 23
- Number
- 9
- Start Page
- 11783
- End Page
- 11789
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/143522
- DOI
- 10.1364/OE.23.011783
- ISSN
- 1094-4087
- Abstract
- We theoretically demonstrate spontaneous PT-symmetry breaking behavior of surface-plasmon polaritons (SPP) in coupled double-slab (DS) waveguides. By virtue of a flat-top field at critical wavelength, the imaginary index of a DS-SPP mode can be controlled via changing the core thickness, while the real index is kept constant. Therefore, a waveguide coupler that consists of a pair of DS-SPP waveguides with different core thicknesses can represent a passive PT-symmetric system, which always maintains symmetry under a real potential. This set-up also represents a good opportunity to investigate the underlying physics of PT-symmetry breaking in non-Hermitian Hamiltonian systems. (C) 2015 Optical Society of America
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