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Nanopattern enabled terahertz all-optical switching on vanadium dioxide thin film
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic diagram of our nanoresonator-patterned sample (array of rectangular holes deposited on the films) and optical pump-THz probe experiments. The array of rectangles has a vertical period of and horizontal period of . The length and the width of each rectangle are 150 μm and 450 nm, respectively. (b) Scanning electron microscopy image of patterned sample. (c) Transmission spectra of patterned sample at the insulator and metal state of . (d) THz switching time measurements for the bare (blue line) and patterned (red line) samples when the structural phase transition of is driven by thermal heating.

Image of FIG. 2.
FIG. 2.

Time traces for transmitted THz waves through (a) bare and (b) patterned samples with (red line) and without (blue line) an optical pump pulse. Transmission spectra of (c) the bare film and (d) the patterned sample with (red line) and without (blue line) pump.

Image of FIG. 3.
FIG. 3.

Peak transmission as a function of time for bare (blue line) and patterned samples (red line) with excitation of optical pump pulse at 0 ps.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nanopattern enabled terahertz all-optical switching on vanadium dioxide thin film