Narrowband terahertz emitters using metamaterial films
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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/m2 when operated at 400Â°. 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.
Optics Express, Volume 20, No. 19, pp. 21025-21032 (10 September 2012)
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Hewitt, C.; Alves, F.; Luscombe, J.; Grbovic, D. (2018-03);Simulated or experimentally measured reflection and transmission are used to obtain effective permittivity (e), permeability (l), and conductivity (r) for a planar microwave metamaterial. These parameters are then used in ...
Gonzalez, Hugo A., Jr. (Monterey, California: Naval Postgraduate School, 2016-06);The terahertz (THz) spectral range remains a relatively untapped portion of the electromagnetic spectrum. THz radiation's unique ability to penetrate non-metallic materials presents an exciting opportunity for many imaging ...
Stinson, Eric A. (Monterey, California: Naval Postgraduate School, 2015-12);The aim of this work is to develop a metamaterial absorber that can be incorporated into a terahertz (THz) imaging system with a 4.7 THz quantum cascade laser (QCL) illumination source. Finite element (FE) simulations were ...