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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: G. I. Stegeman
  • Vol. 23, Iss. 7 — Jul. 1, 2006
  • pp: 1287–1291

Investigation of mode characteristics for a square cavity with a pedestal by a three-dimensional finite-difference time-domain technique

Qin Chen and Yong-Zhen Huang  »View Author Affiliations

JOSA B, Vol. 23, Issue 7, pp. 1287-1291 (2006)

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Mode characteristics of a strongly confined square cavity suspended in air via a pedestal on the substrate are investigated by a three-dimensional finite-difference time-domain technique. The mode wavelengths and mode quality factors (Q factors) are calculated as the functions of the size of the pedestal and the slope angle θ of the sidewalls of the square slab, respectively. For the square slab with side length of 2 μ m , thickness of 0.2 μ m , and refractive index of 3.4, on a square pedestal with refractive index of 3.17, the Q factor of the whispering-gallery (WG)-like mode transverse-electric TE ( 3 , 5 ) o first increases with the side length b of the square pedestal and then quickly decreases as b > 0.4 μ m , but the Q factor of the WG-like mode TE ( 4 , 6 ) o drops down quickly as b > 0.2 μ m , owing to their different symmetries. The results indicate that the pedestal can also result in mode selection in the WG-like modes. In addition, the numerical results show that the Q factors decrease 50% as the slope angle of the sidewalls varies from 90° to 80°. The mode characteristics of WG-like modes in the square cavity with a rectangular pedestal are also discussed. The results show that the nonsquare pedestal largely degrades the WG-like modes.

© 2006 Optical Society of America

OCIS Codes
(140.4780) Lasers and laser optics : Optical resonators
(230.5750) Optical devices : Resonators

ToC Category:
Lasers and Laser Optics

Original Manuscript: November 22, 2005
Manuscript Accepted: January 29, 2006

Qin Chen and Yong-Zhen Huang, "Investigation of mode characteristics for a square cavity with a pedestal by a three-dimensional finite-difference time-domain technique," J. Opt. Soc. Am. B 23, 1287-1291 (2006)

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