High quality-factor whispering-gallery mode in the photonic crystal hexagonal disk cavity
Optics Express, Vol. 12, Issue 8, pp. 1708-1719 (2004)
http://dx.doi.org/10.1364/OPEX.12.001708
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Abstract
We study whispering-gallery-like modes in photonic crystal air-bridge slab micro-cavities having H2 defects using finite-difference time-domain calculations. The defect geometry is optimized to increase the quality factor (Q) of the H2-cavity whispering-gallery mode (WGM). By symmetrically distributing 12 nearest neighbor holes around the defect and controlling size of holes, it is possible to drastically increase the Q of >105 while preserving effective mode volume of the order of the cubic wavelength in material. In addition, we investigate the effect of a dielectric circular post located around the center of the H2 cavity. This post can act as current and heat flow paths that promise electrically-pumped thermally-stable lasing operation. It is interesting to observe that the introduction of the post structure increases the Q of the WGM upto 4×105 and the high Q >105 is still maintained even with large post size. Although diffractive out-coupling through the post is increased, radiated power outside the post is suppressed, which leads to large enhancement of the Q of the H2-cavity WGM.
© 2004 Optical Society of America
OCIS Codes
(230.3990) Optical devices : Micro-optical devices
(230.5750) Optical devices : Resonators
ToC Category:
Research Papers
History
Original Manuscript: February 17, 2004
Revised Manuscript: April 5, 2004
Published: April 19, 2004
Citation
Han-Youl Ryu, Masaya Notomi, Guk-Hyun Kim, and Yong-Hee Lee, "High quality-factor whispering-gallery mode in the photonic crystal hexagonal disk cavity," Opt. Express 12, 1708-1719 (2004)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-12-8-1708
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