Tunable terahertz plasmonic filter based on a substrate of photo-induced phase-transition vanadium dioxide film

A tunable terahertz (THz) filter is reported, which was based on surface plasmonic effects from a subwavelength copper hole array, and the tunability was made possible by a substrate of phase-transition vanadium dioxide (VO2) film. The phase transition of the VO2 film was induced by femtosecond laser pulses and the modulation depth of the THz pulse peak by the VO2 film was measured by THz time-domain spectroscopy to be 80% under optimal fabrication conditions. The change of the conductivity of the substrate film could lead to a shift of the center resonance frequency from 1.33 to 0.92 THz, a relative shift of 30.8%. This tunable THz filter holds great promise for various applications.

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