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Proceedings Paper

Coupled waveguides with exceptional points of degeneracies (Conference Presentation)
Author(s): Mohamed A. K. Othman; Filippo Capolino
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Paper Abstract

We explore the characteristics of exceptional points of degeneracies (EPDs) in coupled waveguides. Second order EPDs are manifested when two modes coalesce, and we show how this can be associated with PT-symmetry. We also demonstrate fourth order EPDs that are manifested in periodic waveguides when four modes coalesce at the degenerate band edge (DBE). Moreover, we elucidate the impact of imperfect coupling, symmetry breaking or balancing gain and loss on the EPDs. Realization of EPDs in resonators can substantially enhance the slow-light characteristics, such as quality factors and local density of states for various applications including low-threshold lasers and sensors.

Paper Details

Date Published: 9 November 2016
PDF: 1 pages
Proc. SPIE 9920, Active Photonic Materials VIII, 99201V (9 November 2016); doi: 10.1117/12.2238428
Show Author Affiliations
Mohamed A. K. Othman, Univ. of California, Irvine (United States)
Filippo Capolino, Univ. of California, Irvine (United States)


Published in SPIE Proceedings Vol. 9920:
Active Photonic Materials VIII
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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