Journal
OPTICS LETTERS
Volume 44, Issue 1, Pages 21-24Publisher
Optica Publishing Group
DOI: 10.1364/OL.44.000021
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Funding
- National Key Basic Research Program of China [2015CB755405]
- National Natural Science Foundation of China (NSFC) [11704358, 61427814]
- Foundation of President of China Academy of Engineering Physics [201501033]
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We demonstrate terahertz (THz) wave near-field imaging with a spatial resolution of similar to 4.5 mu m 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. (C) 2018 Optical Society of America
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