Metallic layer-by-layer photonic crystals for linearly-polarized thermal emission and thermophotovoltaic device including same

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2016-07-26
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Lee, Jae-Hwang
Ho, Kai-Ming
Constant, Kristen
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Constant, Kristen
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Iowa State University Research Foundation, Inc.
The Iowa State University Research Foundation (ISURF) seeks to protect the intellectual property (including new discoveries, technologies, or creative works) of the university's students & faculty which is continuously created through research and other undertakings. It seeks to manage, protect, and own all intellectual property on behalf of the university. The Iowa State University Research Foundation was created in 1938.
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Abstract

Metallic thermal emitters consisting of two layers of differently structured nickel gratings on a homogeneous nickel layer are fabricated by soft lithography and studied for polarized thermal radiation. A thermal emitter in combination with a sub-wavelength grating shows a high extinction ratio, with a maximum value close to 5, in a wide mid-infrared range from 3.2 to 7.8 μm, as well as high emissivity up to 0.65 at a wavelength of 3.7 μm. All measurements show good agreement with theoretical predictions. Numerical simulations reveal that a high electric field exists within the localized air space surrounded by the gratings and the intensified electric-field is only observed for the polarizations perpendicular to the top sub-wavelength grating. This result suggests how the emissivity of a metal can be selectively enhanced at a certain range of wavelengths for a given polarization.

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