Journal
OPTICS EXPRESS
Volume 21, Issue 10, Pages 12507-12518Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.012507
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Funding
- Office of Naval Research under US Navy [N00014-07-1-0819, N00014-11-1-0583]
- National Science Foundation [ECCS-1002340]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1002340] Funding Source: National Science Foundation
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We present a single pixel terahertz (THz) imaging technique using optical photoexcitation of semiconductors to dynamically and spatially control the electromagnetic properties of a semiconductor mask to collectively form a THz spatial light modulator (SLM). By co-propagating a THz and collimated optical laser beam through a high-resistivity silicon wafer, we are able to modify the THz transmission in real-time. By further encoding a spatial pattern on the optical beam with a digital micro-mirror device (DMD), we may write masks for THz radiation. We use masks of varying complexities ranging from 63 to 1023 pixels and are able to acquire images at speeds up to 1/2 Hz. Our results demonstrate the viability of obtaining real-time and high-fidelity THz images using an optically controlled SLM with a single pixel detector. (C) 2013 Optical Society of America
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