Polarized thermal radiation by layer-by-layer metallic emitters with sub-wavelength grating

Jae Hwang Lee, Wai Leung, Tae Guen Kim, Kristen Constant, Kai Ming Ho

Research output: Contribution to journalArticle

13 Citations (Scopus)

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 3.7μm. 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.

Original languageEnglish
Pages (from-to)8742-8747
Number of pages6
JournalOptics Express
Volume16
Issue number12
DOIs
Publication statusPublished - 2008 Jun 9

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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