Open AccessElectrical control of terahertz nano antennas on VO_2 thin film
Author(s) -
Yonghwan Jeong,
Hannes Bernien,
Jisoo Kyoung,
Hyeong Ryeol Park,
Hyun Sun Kim,
Jae Wook Choi,
Bong Jun Kim,
HyunTak Kim,
Kwang Jun Ahn,
Dai Sik Kim
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.021211
Subject(s) - terahertz radiation , materials science , optoelectronics , metamaterial , thin film , optics , transmittance , biasing , nano , voltage , nanotechnology , electrical engineering , physics , engineering , composite material
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.