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Publication Citation: Passive terahertz camera for standoff security screening

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Author(s): Erich N. Grossman; Charles Dietlein;
Title: Passive terahertz camera for standoff security screening
Published: July 01, 2010
Abstract: We describe the construction and performance of a passive, real-time terahertz camera based on a modular, 64-element linear array of cryogenic hotspot microbolometers. A reflective conical scanner sweeps out a 2 m ×4 m(vertical × horizontal) field of view (FOV) at a standoff range of 8 m. The focal plane array is cooled to 4 K in a closed cycle refrigerator, and the signals are detected on free-standing bridges of superconducting Nb or NbN at the feeds of broadband planar spiral antennas. The NETD of the focal-plane array, referred to the target plane and to a frame rate of 5 s−1, is 1:25 K near the center of the array and 2 K overall.
Citation: Applied Optics
Volume: 49
Issue: 19
Pages: pp. 106 - 120
Keywords: terahertz,millimeter-wave,camera,imaging,superconducting,focal-plane array
Research Areas: Nanotechnology, Optoelectronics
PDF version: PDF Document Click here to retrieve PDF version of paper (2MB)