Journal
OPTICS EXPRESS
Volume 20, Issue 19, Pages 21025-21032Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.021025
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- ONR
- Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
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In this article we report on metamaterial- based narrowband thermal terahertz (THz) emitters with a bandwidth of about 1 THz. Single band emitters designed to radiate in the 4 to 8 THz range were found to emit as high as 36 W/m(2) when operated at 400 degrees C. Emission into two well-separated THz bands was also demonstrated by using metamaterial structures featuring more complex unit cells. Imaging of heated emitters using a microbolometer camera fitted with THz optics clearly showed the expected higher emissivity from the metamaterial structure compared to low-emissivity of the surrounding aluminum. (C) 2012 Optical Society of America
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