Compressed sensing with near-field THz radiation
Optical Society of America
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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-μm-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 ∼9 μm (λ∕45 at 0.75 THz). We conclude by experimentally improving the image rate by a factor of ∼3 by undersampling the object with adaptive and compressed sensing algorithms.
Engineering and Physical Sciences Research Council (EPSRC) (EP/K041215/1, EP/M01326X/1); H2020 European Research Council (ERC) (TWISTS, 340507); QinetiQ and EPSRC (iCase award 12440575).
This is the author accepted manuscript. The final version is available from Optical Society of America via the DOI in this record.
Vol. 4 (8), pp. 989 - 992