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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 35, Iss. 14 — Jul. 15, 2010
  • pp: 2385–2387

Mode localization and the Q-factor of a cylindrical microresonator

M. Sumetsky  »View Author Affiliations


Optics Letters, Vol. 35, Issue 14, pp. 2385-2387 (2010)
http://dx.doi.org/10.1364/OL.35.002385


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Abstract

As opposed to the modes in an optical spherical/spheroidal microresonator, the whispering gallery modes in a long cylindrical microresonator are delocalized. Consequently, a circulating light beam that is evanescently coupled into the cylinder and experiences total internal reflection eventually radiates out along the cylinder axis. However, the self-interference of such a beam can produce a resonant mode that is strongly localized along the axial direction. Specifically, the mode characteristic width is ( α β ) 1 / 2 , where α and β are the attenuation and propagation constants of the cylinder material. The Q-factor of this mode can be almost as large as the Q-factor of modes in a spheroidal microresonator with the same α divided by 2.542.

© 2010 Optical Society of America

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(130.6010) Integrated optics : Sensors
(140.4780) Lasers and laser optics : Optical resonators
(230.3990) Optical devices : Micro-optical devices
(140.3948) Lasers and laser optics : Microcavity devices

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: May 11, 2010
Revised Manuscript: June 18, 2010
Manuscript Accepted: June 19, 2010
Published: July 8, 2010

Citation
M. Sumetsky, "Mode localization and the Q-factor of a cylindrical microresonator," Opt. Lett. 35, 2385-2387 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-14-2385


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  23. The difference between a plain mirror resonator and a cylindrical resonator considered here is that the amplitude of a Gaussian beam propagating in three dimensions between two plain mirrors decreases with reflection number N as 1/N. In a cylinder, a Gaussian beam is not expanding in the radial direction and its amplitude decreases much slower as 1/N. For this reason, in a cylinder, the sum of the interfering components has a much stronger divergence.

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