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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 11 — May. 25, 2009
  • pp: 9434–9441

Whispering-gallery mode micro-kylix resonators

Mher Ghulinyan, Alessandro Pitanti, Georg Pucker, and Lorenzo Pavesi  »View Author Affiliations


Optics Express, Vol. 17, Issue 11, pp. 9434-9441 (2009)
http://dx.doi.org/10.1364/OE.17.009434


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Abstract

Owing to their ability to confine electromagnetic energy in ultrasmall dielectric volumes, micro-disk, ring and toroid resonators hold interest for both specific applications and fundamental investigations. Generally, contributions from various loss channels within these devices lead to limited spectral windows (Q-bands) where highest mode Q-factors manifest. Here we describe a strategy for tuning Q-bands using a new class of micro-resonators, named micro-kylix resonators, in which engineered stress within an initially flat disk results in either concave or convex devices. To shift the Q-band by 60nm towards short wavelengths in flat micro-disks a 50% diameter reduction is required, which causes severe radiative losses suppressing Q’s. With a micro-kylix, we achieve similar tuning and even higher Q’s by two orders of magnitude smaller diameter modification (0.4%). The phenomenon relies on geometry-induced smart interplay between modified dispersions of material absorption and radiative loss-related Q-factors. Micro-kylix devices can provide new functionalities and novel technological solutions for photonics and micro-resonator physics.

© 2009 Optical Society of America

OCIS Codes
(230.1150) Optical devices : All-optical devices
(230.5750) Optical devices : Resonators
(250.5230) Optoelectronics : Photoluminescence
(140.3948) Lasers and laser optics : Microcavity devices

ToC Category:
Optical Devices

History
Original Manuscript: March 23, 2009
Revised Manuscript: May 5, 2009
Manuscript Accepted: May 5, 2009
Published: May 21, 2009

Citation
Mher Ghulinyan, Alessandro Pitanti, Georg Pucker, and Lorenzo Pavesi, "Whispering-gallery mode micro-kylix resonators," Opt. Express 17, 9434-9441 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-11-9434


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