Journal
OPTICA
Volume 4, Issue 8, Pages 989-992Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.4.000989
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Funding
- Engineering and Physical Sciences Research Council (EPSRC) [(EP/K041215/1, EP/M01326X/1]
- H European Research Council (ERC) (TWISTS [340507]
- QinetiQ and EPSRC (iCase award) [12440575]
- EPSRC [EP/M01326X/1, EP/F026757/1, EP/K041215/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M01326X/1, EP/K041215/1, 1341325, EP/F026757/1] Funding Source: researchfish
- European Research Council (ERC) [340507] Funding Source: European Research Council (ERC)
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We demonstrate a form of near-field terahertz (THz) imaging that is compatible with compressed sensing algorithms. By spatially photomodulating THz pulses using a set of shaped binary optical patterns and employing a 6-mu m-thick silicon wafer, we are able to reconstruct THz images of an object placed on the exit interface of the wafer. A single-element detector is used to measure the electric field amplitude of transmitted THz radiation for each projected pattern, with the ultra-thin wafer allowing us to access the THz evanescent near fields to achieve a spatial resolution of similar to 9 mu m (lambda/45 at 0.75 THz). We conclude by experimentally improving the image rate by a factor of similar to 3 by undersampling the object with adaptive and compressed sensing algorithms.
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