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# Humboldt-Universität zu Berlin - Faculty of Mathematics and Natural Sciences - Optical Systems

Terahertz dynamic aperture imaging at stand-off distances using a Compressed Sensing protocol

Sven Augustin, Peter Jung, Sven Frohmann, and Heinz-Wilhelm Hübers (2019)

# Terahertz dynamic aperture imaging at stand-off distances using a Compressed Sensing protocol

IEEE Transactions on Terahertz Science and Technology, 9(4):364–372.

In this paper, results of a 0.35 THz dynamic aperture imaging approach are presented. The experiments use an optical modulation approach and a single pixel detector at a standoff imaging distance of 1 m. The optical modulation creates dynamic apertures of 5-cm diameter with 2000 individually controllable elements. An optical modulation approach is used here for the first time at a large far-field distance, for the investigation of various test targets in a field-of-view of 8 $\times$ 8 cm2. The results highlight the versatility of this modulation technique and show that this imaging paradigm is applicable even at large far-field distances. It proves the feasibility of this imaging approach for potential applications like standoff security imaging or far field THz microscopy.

Computational imaging, inverse problems, spatial light modulators (SLMs), terahertz (THz) imaging