Electrical tunability due to coalescence of exceptional points in parity-time symmetric waveguides

Jin Wang, Hui Yuan Dong, Raymond P.H. Wu, T. C. Mok, Kin Hung Fung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


� 2017 Optical Society of America. 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.
Original languageEnglish
Pages (from-to)535-538
Number of pages4
JournalOptics Letters
Issue number3
Publication statusPublished - 1 Feb 2017

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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