Archive > Volume 11 Issue 3 > 2015,11(3):174-178. DOI:10.1007/s11801-015-5017-y CSTR:[cstr] Prev Next
A high quality factor photonic crystal channel-drop filter with a linear gradient microcavity
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Abstract:
We design a channel-drop filter (CDF) with a linear gradient microcavity in a two-dimensional (2D) photonic crystal (PC). The model of three-port CDF with reflector is used to achieve high quality factor (Q-factor) and 100% channel-drop efficiency. The research indicates that adjusting the distance between reference plane and reflector can simultaneously influence the Q-factor due to coupling to a bus waveguide and the phase retardation occurring in the round trip between a microcavity and a reflector. The calculation results of 2D finite-difference time-domain (FDTD) method show that the designed filter can achieve the drop efficiency of 96.7% and ultra-high Q-factor with an ultra-small modal volume.
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This work has been supported by the Natural Science Foundation of the Higher Education Institutions of Guangxi Province in China (No.201202ZD010).
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