MEMS terahertz focal plane array with optical readout
Gonzalez, Hugo A., Jr.
Alves, Fabio D.P.
Kim, Jae Jun
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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 applications. The purpose of this research is to investigate a unique imaging method using a THz radiation source and metamaterial absorber. By using a metamaterial absorber, the THz detection frequency of interest can be tuned by controlling geometrical parameters with nearly 100% absorption. THz sensing can be achieved by integrating a metamaterial absorber with bi-material legs to form a sensor. Moveable mirror-like surfaces on the backside of the metamaterial under THz absorption can cause a deflection of visible light and from it, the original image can be reconstructed using an optical readout system. In this thesis, the construction of the optical readout system for characterization of sensor pixels as well as THz imaging is described.
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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 ...
Alves, Fabio; Pimental, Leroy; Grbovic, Dragoslav; Karunasiri, Gamani (Nature, 2018-08-20);A MEMS terahertz-to-infrared converter has been developed based on the unique properties of metamaterials that allow for selective control of the absorptivity and emissivity of the sensors. The converter consists of a ...
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 ...