Resonant cavity based compact efficient antireflection structures for photonic crystals

Date
2007
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Source Title
Journal of Physics D: Applied Physics
Print ISSN
0022-3727
Electronic ISSN
1361-6463
Publisher
Institute of Physics Publishing Ltd.
Volume
40
Issue
19
Pages
5873 - 5877
Language
English
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Abstract

We propose an effective admittance (EA) method to design antireflection structures for two-dimensional photonic crystals (PCs). We demonstrate that a compact and efficient antireflection structure, which is difficult to obtain by the conventional admittance matching method, can be readily designed by the EA method. The antireflection structure consists of an air slot resonant cavity that is constructed only with the materials that constitute the PC. Compared with a bare PC, the reflection from a PC with an antireflection structure is reduced by two orders of magnitude over a wide bandwidth. To confirm the presented EA method, finite-difference time-domain (FDTD) simulations are performed, and the results from the FDTD and the EA method are in good agreement.

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