Document Type

Article

Publication Date

6-9-2008

Journal or Book Title

Optics Express

Volume

16

Issue

12

First Page

8742

Last Page

8747

DOI

10.1364/OE.16.008742

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.

Comments

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

Rights

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) http://dx.doi.org/10.1364/OE.16.008742. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

Copyright Owner

Optical Society of America

Language

en

File Format

application/pdf

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