Design of tapering one-dimensional photonic crystal ultrahigh-Q microcavities

Reference:

Chen, Q. and Allsopp, D. W. E., 2009. Design of tapering one-dimensional photonic crystal ultrahigh-Q microcavities. Photonics and Nanostructures - Fundamentals and Applications, 7 (1), pp. 19-25.

Related documents:

Official URL:

http://dx.doi.org/10.1016/j.photonics.2008.11.002

Abstract

One-dimensional (1D) photonic crystal (PC) microcavities can be readily embedded into silicon-on-insulator waveguides for photonic integration. Such structures are investigated by 2D Finite-Difference Time-Domain method to identify designs with high transmission which is essential for device integration. On-resonance transmission is found to decrease with the increasing mirror pairs, however, the quality factor (Q) increases to a saturated value. The addition to the Bragg mirrors of tapered periods optimized to produce a cavity mode with a near Gaussian shaped envelope results in a major reduction in vertical loss. Saturated Q up to 2.4 106 is feasible if the internal tapers are properly designed. The effect of increasing transmission is also demonstrated in a structure with the external tapers.

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