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Opt Express. 2011 Oct 24;19(22):21211-5. doi: 10.1364/OE.19.021211.

Electrical control of terahertz nano antennas on VO2 thin film.

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  • 1Department of Physics and Astronomy and Center for Subwavelength Optics, Seoul National University,Seoul, 151-747, Republic of Korea.


We demonstrate an active metamaterial device that allows to electrically control terahertz transmission over more than one order of magnitude. Our device consists of a lithographically defined gold nano antenna array fabricated on a thin film of vanadium dioxide (VO(2)), a material that possesses an insulator to metal transition. The nano antennas let terahertz (THz) radiation funnel through when the VO(2) film is in the insulating state. By applying a dc-bias voltage through our device, the VO(2) becomes metallic. This electrically shorts the antennas and therefore switches off the transmission in two distinct regimes: reversible and irreversible switching.

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