Introduction of a planar defect into colloidal photonic-crystal films and their optical properties |
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Affiliation: | 1. Field of Advanced Ceramics, Department of Life Science and Applied Chemistry, Nagoya Institute of Technology (NITech), Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan;2. Frontier Research Institute for Material Science (FRIMS), Nagoya Institute of Technology (NITech), Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan;3. Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba 305-0047, Japan |
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Abstract: | A defect mode in the bandgap of photonic crystals is a key factor for potential applications, emission, bandpass filter, sensor, and low throughput laser. A Fabry-Perot type cavity was known as a multilayer film with a planar defect or a one-dimensional colloidal photonic crystal film with a planar defect. In this work, we have developed a simple and easy method by two colloidal crystals, i.e., face center cubic (fcc) structure, films bonded together by hot pressing to form a sandwich structure, and clear defect mode was observed in the photonic bandgap of fcc (1 1 1) direction. We have investigated the effect of the thickness of the defect layer in the sandwich structure on the optical properties. A single or double dips appeared in Bragg's diffraction peak at different planar defect thicknesses. In addition, a simulation of the reflection spectra of multilayer film calculation showed the defect mode is much influenced by the planar defect thickness. |
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Keywords: | Colloidal crystal Photonic crystal Planar defect Fabry-Perot cavity Multilayer interference |
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