Photonic bandgaps of conformally coated structures

Date
2005-12-01
Authors
Biswas, Rana
Constant, Kristen
Ahn, Jinho
Lee, Taoho
Lee, Jae-Hwang
Kim, Yong-Sung
Kim, Chang-Hwan
Leung, Wai
Oh, Cha-Hwan
Constant, Kristen
Ho, Kai-Ming
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Abstract

Polymeric molds of the layer-by-layer photonic crystal can be economically synthesized with a microtransfer molding technique. The refractive indices of these molds are low, preventing formation of a photonic bandgap. We find that such molds can be conformally coated with higher-index material. Photonic band calculations find structures in which conformally coated layer-by-layer molds have complete bandgaps for both titania and silicon coatings. Large stop bands exist in the 001 stacking direction. Feasibility of experimental conformal coating of the molds has been demonstrated with a titania-coated polyurethane mold, which shows optical features in agreement with simulations of reflection and transmission.

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This article is from Journal of the Optical Society of America B 22 (2005): 2728–2733, doi:10.1364/JOSAB.22.002728. Posted with permission.

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Ames Laboratory, Physics and Astronomy, Electrical and Computer Engineering, Microelectronics Research Center
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