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Title: Exceptional points and asymmetric mode conversion in quasi-guided dual-mode optical waveguides
Authors: Ghosh, Somnath N.
Chong, Yi Dong
Keywords: Optical Waveguide
Exceptional Points
Issue Date: 2016
Source: Ghosh, S. N., & Chong, Y. D. (2016). Exceptional points and asymmetric mode conversion in quasi-guided dual-mode optical waveguides. Scientific Reports, 6, 19837-. doi:10.1038/srep19837
Series/Report no.: Scientific Reports
Abstract: Non-Hermitian systems host unconventional physical effects that be used to design new optical devices. We study a non-Hermitian system consisting of 1D planar optical waveguides with suitable amount of simultaneous gain and loss. The parameter space contains an exceptional point, which can be accessed by varying the transverse gain and loss profile. When light propagates through the waveguide structure, the output mode is independent of the choice of input mode. This “asymmetric mode conversion” phenomenon can be explained by the swapping of mode identities in the vicinity of the exceptional point, together with the failure of adiabatic evolution in non-Hermitian systems.
DOI: 10.1038/srep19837
Schools: School of Physical and Mathematical Sciences 
Rights: © 2016 The Authors (Nature Publishing Group). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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