Giant nonlinear response of terahertz nanoresonators on VO2 thin film.
We report on an order of magnitude enhanced nonlinear response of vanadium dioxide thin film patterned with nanoresonators--nano slot antennas fabricated on the gold film. Transmission of terahertz radiation, little affected by an optical pumping for the case of bulk thin film, can now be completely switched-off: DeltaT/T approximately -0.9999 by the same optical pumping power. This unprecedentedly large optical pump-terahertz probe nonlinearity originates from the insulator-to-metal phase transition drastically reducing the antenna cross sections of the nanoresonators. Our scheme enables nanoscale-thin film technology to be used for all-optical switching of long wavelength light.
Kyoung
Jisoo
J
Center for Subwavelength Optics and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
Seo
Minah
M
Park
Hyeongryeol
H
Koo
Sukmo
S
Kim
Hyun-sun
HS
Park
Youngmi
Y
Kim
Bong-Jun
BJ
Ahn
Kwangjun
K
Park
Namkyoo
N
Kim
Hyun-Tak
HT
Kim
Dai-Sik
DS
D017076:Computer-Aided Design; D004867:Equipment Design; D049329:Nanostructures / Q000737:chemistry*; D012031:Refractometry / Q000295:instrumentation; D012542:Scattering, Radiation; D055053:Terahertz Radiation; D017968:Vanadium Compounds / Q000737:chemistry*
D017968:Vanadium Compounds