Approaching real-time terahertz imaging using photo-induced reconfigurable aperture arrays

Md. Itrat Bin Shams; Zhenguo Jiang; Syed Rahman; Jubaid Qayyum; Jeffrey L. Hesler; Li-Jing Cheng; Huili Grace Xing; Patrick Fay; Lei Liu

doi:10.1117/12.2053326

21 May 2014 Approaching real-time terahertz imaging using photo-induced reconfigurable aperture arrays

Md. Itrat Bin Shams, Zhenguo Jiang, Syed Rahman, Jubaid Qayyum, Jeffrey L. Hesler, Li-Jing Cheng, Huili Grace Xing, Patrick Fay, Lei Liu

Author Affiliations +

Proceedings Volume 9102, Terahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense; 910207 (2014) https://doi.org/10.1117/12.2053326
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

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 cm²imaging 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, and 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); https://doi.org/10.1117/12.2053326

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