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Infrared Absorption by Ferroelectric Thin-Film Structures
ARMY RESEARCH LAB ADELPHI MD
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Infrared absorbing, air-bridge, structures are anticipated to be used in the next generation of ferroelectric uncooled infrared detectors. These structures will consist of resonant cavities with an absorbing bridge element, which contains the ferroelectric detector and the contact electrodes. It is desired to use an oxide electrode rather than a metallic electrode, as the metallic electrode reflects too much of the incoming radiation at reasonable thickness. For this paper, spectral transmission and reflection of LSCO films was measured and it was found that the properties could be described as a simple two-dimensional conducting sheet. The optical absorption of several air-bridge structures was modeled, and optimized dimensions and electrode conductivity are presented which yield greater than 80 absorption over the full 8-14 m band.
APPROVED FOR PUBLIC RELEASE