Computational terahertz imaging via spatio-temporal emissivity modulation

Michal Mrnka; Harry Penketh; Ian R. Hooper; Sonal Saxena; Nicholas E. Grant; John D. Murphy; David B. Phillips; Euan Hendry

doi:10.1117/12.3022185

18 June 2024 Computational terahertz imaging via spatio-temporal emissivity modulation

Michal Mrnka, Harry Penketh, Ian R. Hooper, Sonal Saxena, Nicholas E. Grant, John D. Murphy, David B. Phillips, Euan Hendry

Author Affiliations +

Proceedings Volume 12994, Terahertz Photonics III; 129940F (2024) https://doi.org/10.1117/12.3022185
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Spatial and temporal control of thermally emitted terahertz (THz) radiation could pave the way for a new family of devices in imaging, spectroscopy and communication systems. We demonstrate a computational THz imaging method enabled by a structured illumination provided by a spatio-temporal emissivity modulation. We apply a surface passivation stack composed of ZnO and Al₂O₃ layers to a high-resistivity silicon wafer to increase the effective carrier lifetime of the electron-hole pairs by a factor of 16. The emitted power is further boosted by increasing the temperature of the modulator to 390 K. Using a low power LED and a digital micromirror device we optically control the local THz emission from the modulator and use it to produce structured THz beams in a single-pixel imaging setup. We employ a ghost imaging procedure with a single-pixel detector and sequential illumination with patterns from a Hadamard basis set to allow for computational reconstruction of the object from the temporal signal. We evaluate the performance of the technique and its potential trade-offs with respect to resolution and acquisition time and apply a simple compressed sensing protocol to speed up the imaging process.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Michal Mrnka, Harry Penketh, Ian R. Hooper, Sonal Saxena, Nicholas E. Grant, John D. Murphy, David B. Phillips, and Euan Hendry "Computational terahertz imaging via spatio-temporal emissivity modulation", Proc. SPIE 12994, Terahertz Photonics III, 129940F (18 June 2024); https://doi.org/10.1117/12.3022185

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