Terahertz wave near-field compressive imaging with a spatial resolution of over λ/100.
Opt Lett
; 44(1): 21-24, 2019 Jan 01.
Article
em En
| MEDLINE
| ID: mdl-30645535
ABSTRACT
We demonstrate terahertz (THz) wave near-field imaging with a spatial resolution of â¼4.5 µm using single-pixel compressive sensing enabled by femtosecond-laser (fs-laser) driven vanadium dioxide (VO2)-based spatial light modulator. By fs-laser patterning a 180 nm thick VO2 nanofilm with a digital micromirror device, we spatially encode the near-field THz evanescent waves. With single-pixel Hadamard detection of the evanescent waves, we reconstructed the THz wave near-field image of an object from a serial of encoded sequential measurements, yielding improved signal-to-noise ratio by one order of magnitude over a raster-scanning technique. Further, we demonstrate that the acquisition time was compressed by a factor of over four with 90% fidelity using a total variation minimization algorithm. The proposed THz wave near-field imaging technique inspires new and challenging applications such as cellular imaging.
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MEDLINE
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En
Ano de publicação:
2019
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Article