Design of tapering one-dimensional photonic crystal ultrahigh-Q microcavities
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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.
|Creators||Chen, Q.and Allsopp, D. W. E.|
|Uncontrolled Keywords||time domain analysis, method of moments, crystal filters, two dimensional, microcavities, photonic crystals, q factor measurement, mirrors, crystal atomic structure|
|Departments||Faculty of Engineering & Design > Electronic & Electrical Engineering|
|Research Centres||Centre for Advanced Sensor Technologies (CAST)|
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