Investigation of MEMS bi-material sensors with metamaterial absorbers for THz imaging [video]
MetadataShow full item record
There has been a continued interest in the terahertz (THz) imaging due to penetration through non-metallic objects and non-ionizing properties. Real-time imaging in this spectral range has been demonstrated using infrared microbolometer technology with external illumination provided by quantum cascade lasers (QCL). However, to achieve high sensitivity, it is necessary to develop focal plane arrays using enhanced THz absorbing materials. One attractive option to achieve real time THZ imaging is MEMS bi-material sensor built with metamaterial absorbers, which consists of a periodic array of metallic squared elements separated from a homogeneous metallic ground plane by a dielectric layer. We have demonstrated that the metamaterial films can be designed using standard MEMS materials to exhibit nearly 100 % resonant absorption matched to the illumination source. These materials can also provide structural support, desired thermomechanical properties and access to external optical readout for fabricating bi-material THz sensors. Several sensor configurations have been designed, fabricated and characterized to optimize responsivity, speed of operation and minimize residual structural stress during MEMS fabrication. The details of the design, fabrication and characterization of bi-material THz sensors and their potential in real time imaging will be discussed in this presentation.
Showing items related by title, author, creator and subject.
Enhancement of the point-spread function for imaging in scattering media by use of polarization-difference imaging Tyo, J. Scott (2000-01);Polarization-difference (PD) imaging techniques have been demonstrated to improve the detectability of target features that are embedded in scattering media. The improved detectability occurs for both passive imaging in ...
Ng Chee Yong (Monterey, California: Naval Postgraduate School, 2009-12);In this thesis, we study the new imaging theory developed by Cheney and Borden  that incorporates target motion during data collection for the imaging process. The subject of radar imaging from scattered waves is explored ...
Detection of 3.4 THz radiation from a quantum cascade laser using a microbolometer infrared camera Karunasiri, Gamani; Chamberlain, Danielle; Behnken, Barry N.; Lowe, Michele; Robrish, Peter (SPIE, 2007-05);The THz wavelengths cover the frequency range of 0.1-10 THz or 30-3000 μm wavelength band. Currently, detection of THz radiation is carried out using either antenna-coupled semiconductor detectors or superconducting ...