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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 17 — Sep. 1, 2014
  • pp: 5026–5029

PT-symmetric microring laser-absorber

Stefano Longhi and Liang Feng  »View Author Affiliations


Optics Letters, Vol. 39, Issue 17, pp. 5026-5029 (2014)
http://dx.doi.org/10.1364/OL.39.005026


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Abstract

The lasing and coherent perfect absorption (CPA) properties of PT-symmetric microrings with mixed index and gain gratings, externally coupled to a bus waveguide, are theoretically investigated. For a complex grating at the PT-symmetry breaking point, perfect unidirectional (either clockwise or counterclockwise) laser emission can be realized, but the grating does not discriminate longitudinal modes and CPA can not be simultaneously achieved. Above the grating the PT-symmetry breaking point, single-mode emission, and simultaneous CPA can be obtained, with unbalanced and controllable excitation of clockwise and counterclockwise modes in the ring.

© 2014 Optical Society of America

OCIS Codes
(130.0130) Integrated optics : Integrated optics
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3490) Lasers and laser optics : Lasers, distributed-feedback

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: June 19, 2014
Revised Manuscript: July 16, 2014
Manuscript Accepted: July 17, 2014
Published: August 19, 2014

Citation
Stefano Longhi and Liang Feng, "PT-symmetric microring laser-absorber," Opt. Lett. 39, 5026-5029 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-17-5026


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