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

Shams, Md. Itrat Bin; Jiang, Zhou; Rahman, Seikh Mohammad Habibur; Qayyum, Jubaid Abdul; Hesler, Jeffrey L.; Cheng, Li-Jing; Xing, Huili Grace; Fay, Patrick; Liu, Lei

doi:10.1117/12.2053326

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…With this approach, each pixel of the coded mask can be turned “on” and “off” with a modulation depth of ∼35 dB for a 0.5 cm 2 imaging area at 590 GHz . The modulation speed can be as high as 32 kHz using a commercial Texas Instrument (TI) digital mirror device chip , leading to a potentially real‐time THz imaging rate (e.g., 24 frames per second for a 32 × 32, or 1k pixel image frame) if combined with a compressive sensing algorithm .…”

Section: Photo‐induced Thz Caimentioning

confidence: 99%

Characterization of terahertz antennas using photoinduced coded‐aperture imaging

Shams

Jiang

Qayyum

et al. 2015

Micro & Optical Tech Letters

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We report a novel approach for characterization of terahertz (THz) antennas using the photoinduced coded-aperture imaging (PI-CAI) technique. For a prototype demonstration, a WR-1.5 (500-750 GHz) diagonal horn antenna has been fully characterized. The THz beam radiated from the antenna was imaged using the PI-CAI technique at different distances from the antenna aperture. The measured beam profiles show near-Gaussian shapes, with the expected propagation properties. The far-field antenna radiation patterns were then extracted from the far-field beam image and compared with conventional measurement results, theoretical calculation and full-wave simulation. Finally, the antenna Gaussian coupling efficiency was calculated to be $83% based on the two-dimensional (2-D) beam mapping technique. Antenna radiation parameters obtained using the above approach show good agreement with published literature and manufacturer datasheets, demonstrating the potential of the PI-CAI approach for fast and accurate characterization of THz antennas.

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Section: Photo‐induced Thz Caimentioning

confidence: 99%