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Polarized thermal radiation by layer-by-layer metallic emitters with sub-wavelength grating
Optics Express
  • Jae-Hwang Lee, Iowa State University
  • Wai Y. Leung, Iowa State University
  • Tae Guen Kim, Korea University
  • Kristen P. Constant, Iowa State University
  • Kai-Ming Ho, Iowa State University
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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 3.7µm. 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.

This article is from Optics Express 16 (2008): 8742–8747, doi:10.1364/OE.16.008742. Posted with permission.

This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Optics Express, Vol. 16, Issue 12, pp. 8742-8747 (2008) Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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Optical Society of America
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Jae-Hwang Lee, Wai Y. Leung, Tae Guen Kim, Kristen P. Constant, et al.. "Polarized thermal radiation by layer-by-layer metallic emitters with sub-wavelength grating" Optics Express Vol. 16 Iss. 12 (2008) p. 8742 - 8747
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