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Terahertz wave near-field compressive imaging with a spatial resolution of over λ/100.

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We demonstrate terahertz (THz) wave near-field imaging with a spatial resolution of ∼4.5  μm using single-pixel compressive sensing enabled by femtosecond-laser (fs-laser) driven vanadium dioxide (VO2)-based spatial light modulator. By fs-laser… Click to show full abstract

We demonstrate terahertz (THz) wave near-field imaging with a spatial resolution of ∼4.5  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.

Keywords: field; near field; wave near; spatial resolution; imaging spatial

Journal Title: Optics letters
Year Published: 2019

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