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Title: Electrical tunability due to coalescence of exceptional points in parity-time symmetric waveguides
Authors: Wang, J
Dong, HY
Mok, TC
Fung, KH 
Issue Date: 2017
Publisher: Optical Society of America
Source: Optics letters, 2017, v. 42, no. 3, p. 535-538 How to cite?
Journal: Optics letters 
Abstract: We demonstrate theoretically the electric tunability due to the coalescence of exceptional points in PT-symmetric waveguides bounded by imperfect conductive layers. Owing to the competition effect of multimode interaction, multiple exceptional points and PT phase transitions could be attained in such a simple system, and their occurrences are strongly dependent on the boundary conductive layers. When the conductive layers become very thin, it is found that the oblique transmittance and reflectance of the same system can be tuned between zero and one by a small change in the carrier density. The results may provide an effective method for fast tuning and modulation of optical signals through electrical gating.
ISSN: 0146-9592
EISSN: 1539-4794
DOI: 10.1364/OL.42.000535
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