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Optimization of the Q factor in photonic crystal microcavities

Vučković, Jelena and Lončar, Marko and Mabuchi, Hideo and Scherer, Axel (2002) Optimization of the Q factor in photonic crystal microcavities. IEEE Journal of Quantum Electronics, 38 (7). pp. 850-856. ISSN 0018-9197. doi:10.1109/JQE.2002.1017597.

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We express the quality factor of a mode in terms of the Fourier transforms of its field components and prove that the reduction in radiation loss can be achieved by suppressing the mode's wavevector components within the light cone. Although this is intuitively clear, our analytical proof gives us insight into how to achieve the Q factor optimization, without the mode delocalization. We focus on the dipole defect mode in free-standing membranes and achieve Q > 10^4, while preserving the mode volume of the order of one half of the cubic wavelength of light in the material. The derived expressions and conclusions can be used in the optimization of the Q factor for any type of defect in planar photonic crystals.

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Additional Information:© 2002 IEEE. Reprinted with permission. Manuscript received September 18, 2001; revised January 8, 2002. This work was supported by the Caltech MURI Center for Quantum Networks. One of the authors, J. Vučković, would like to thank Prof. Y. Yamamoto, Stanford University, Stanford, CA, for many fruitful discussions.
Funding AgencyGrant Number
Army Research Office (ARO)UNSPECIFIED
Subject Keywords:FDTD methods, Fourier transforms, integrated optics, optical resonators, optics, optoelectronic devices, Q factor
Issue or Number:7
Record Number:CaltechAUTHORS:VUCieeejqe02
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2791
Deposited By: Archive Administrator
Deposited On:27 Apr 2006
Last Modified:08 Nov 2021 19:50

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