21 May 2014 Approaching real-time terahertz imaging using photo-induced reconfigurable aperture arrays
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Abstract
We report a technique using photo-induced coded-aperture arrays for potential real-time THz imaging at roomtemperature. The coded apertures (based on Hadamard coding) were implemented using programmable illumination on semi-insulating Silicon wafer by a commercial digital-light processing (DLP) projector. Initial imaging experiments were performed in the 500-750 GHz band using a WR-1.5 vector network analyzer (VNA) as the source and receiver. Over the entire band, each array pixel can be optically turned on and off with an average modulation depth of ~20 dB and ~35 dB, for ~4 cm2 and ~0.5 cm2 imaging areas respectively. The modulation speed is ~1.3 kHz using the current DLP system and data acquisition software. Prototype imaging demonstrations have shown that a 256-pixel image can be obtained in the order of 10 seconds using compressed sensing (CS), and this speed can be improved greatly for potential real-time or video-rate THz imaging. This photo-induced coded-aperture imaging (PI-CAI) technique has been successfully applied to characterize THz beams in quasi-optical systems and THz horn antennas.
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Md. Itrat Bin Shams, Zhenguo Jiang, Syed Rahman, Jubaid Qayyum, Jeffrey L. Hesler, Li-Jing Cheng, Huili Grace Xing, Patrick Fay, Lei Liu, "Approaching real-time terahertz imaging using photo-induced reconfigurable aperture arrays", Proc. SPIE 9102, Terahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense, 910207 (21 May 2014); doi: 10.1117/12.2053326; https://doi.org/10.1117/12.2053326
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