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


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.

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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.


Item Type Articles
CreatorsChen, Q.and Allsopp, D. W. E.
Related URLs
Uncontrolled Keywordstime domain analysis,method of moments,crystal filters,two dimensional,microcavities,photonic crystals,q factor measurement,mirrors,crystal atomic structure
DepartmentsFaculty of Engineering & Design > Electronic & Electrical Engineering
Research CentresCentre for Advanced Sensor Technologies (CAST)
ID Code15425


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