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Proceedings Paper

Approaching real-time terahertz imaging using photo-induced reconfigurable aperture arrays
Author(s): Md. Itrat Bin Shams; Zhenguo Jiang; Syed Rahman; Jubaid Qayyum; Jeffrey L. Hesler; Li-Jing Cheng; Huili Grace Xing; Patrick Fay; Lei Liu
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Paper 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.

Paper Details

Date Published: 21 May 2014
PDF: 8 pages
Proc. SPIE 9102, Terahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense, 910207 (21 May 2014); doi: 10.1117/12.2053326
Show Author Affiliations
Md. Itrat Bin Shams, Univ. of Notre Dame (United States)
Zhenguo Jiang, Univ. of Notre Dame (United States)
Syed Rahman, Univ. of Notre Dame (United States)
Jubaid Qayyum, Univ. of Notre Dame (United States)
Jeffrey L. Hesler, Virginia Diodes, Inc. (United States)
Li-Jing Cheng, Oregon State Univ. (United States)
Huili Grace Xing, Univ. of Notre Dame (United States)
Patrick Fay, Univ. of Notre Dame (United States)
Lei Liu, Univ. of Notre Dame (United States)


Published in SPIE Proceedings Vol. 9102:
Terahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense
Mehdi F. Anwar; Thomas W. Crowe; Tariq Manzur, Editor(s)

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