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Spectral Control of Thermal Radiation by Metallic Surface Relief Gratings

Published online by Cambridge University Press:  31 January 2011

Hitoshi Sai
Affiliation:
hitoshi-sai@aist.go.jp, AIST, Central 2, 1-1-1, Umezono, Tsukuba, 3058568, Japan
Yoshiaki Kanamori
Affiliation:
kanamori@hane.mech.tohoku.ac.jp, Tohoku University, Sendai, Miyagi, Japan
Kengo Watanabe
Affiliation:
k_watanabe@energy.mech.tohoku.ac.jp, Tohoku University, Sendai, Miyagi, Japan
Hiroo Yugami
Affiliation:
h_yugami@energy.mech.tohoku.ac.jp, Tohoku University, Sendai, Miyagi, Japan
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Abstract

The microcavity effect of two-dimensional W surface-relief gratings has been investigated by means of the finite-difference time-domain simulation. The peak structure of the spectral emissivity of W gratings with a number of microcavities is in good agreement with the spectral features of a single microcavity. This result shows that the emissivity enhancement by W gratings with microcavities is mainly attributable to the microcavity effect that arises from each microcavity. It is that the spectral emissivity can be controlled by a combination of several microcavities with different parameters, and that not only a rectangular but a cylindrical microcavity also shows the microcavity effect according to its cavity modes.

Type
Research Article
Copyright
Copyright © Materials Research Society 2009

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