title: Terahertz-Triggered Phase Transition and Hysteresis Narrowing in a Nanoantenna Patterned Vanadium Dioxide Film.
abstract: We demonstrate that high-field terahertz (THz) pulses trigger transient insulator-to-metal transition in a nanoantenna patterned vanadium dioxide thin film. THz transmission of vanadium dioxide instantaneously decreases in the presence of strong THz fields. The transient THz absorption indicates that strong THz fields induce electronic insulator-to-metal transition without causing a structural transformation. The transient phase transition is activated on the subcycle time scale during which the THz pulse drives the electron distribution of vanadium dioxide far from equilibrium and disturb the electron correlation. The strong THz fields lower the activation energy in the insulating phase. The THz-triggered insulator-to-metal transition gives rise to hysteresis loop narrowing, while lowering the transition temperature both for heating and cooling sequences. THz nanoantennas enhance the field-induced phase transition by intensifying the field strength and improve the detection sensitivity via antenna resonance. The experimental results demonstrate a potential that plasmonic nanostructures incorporating vanadium dioxide can be the basis for ultrafast, energy-efficient electronic and photonic devices.
authors: Department of Physics, Oregon State University , Corvallis, Oregon 97331-6507, United States.
authors: Zachary J
authors: ZJ
authors: Thompson
authors: Department of Physics, Oregon State University , Corvallis, Oregon 97331-6507, United States.
authors: Andrew
authors: A
authors: Stickel
authors: Department of Physics and Astronomy and Center for Atomic Scale Electromagnetism, Seoul National University , Seoul 151-747, Republic of Korea.
authors: Young-Gyun
authors: YG
authors: Jeong
authors: Photonic Systems Laboratory, School of EECS, Seoul National University , Seoul 151-744, Republic of Korea.
authors: Sanghoon
authors: S
authors: Han
authors: Department of Physics and Department of Energy Systems Research, Ajou University , Suwon 443-749, Republic of Korea.
authors: Byung Hee
authors: BH
authors: Son
authors: Department of Physics, Oregon State University , Corvallis, Oregon 97331-6507, United States.
authors: Michael J
authors: MJ
authors: Paul
authors: Department of Physics, Oregon State University , Corvallis, Oregon 97331-6507, United States.
authors: Byounghwak
authors: B
authors: Lee
authors: Department of Physics, Oregon State University , Corvallis, Oregon 97331-6507, United States.
authors: Ali
authors: A
authors: Mousavian
authors: Creative Research Center of Metal-Insulator Transition, Electronics and Telecommunications Research Institute , Daejeon 305-700, Republic of Korea.|School of Advanced Device Technology, University of Science & Technology , Daejeon 305-333, Republic of Korea.
authors: Giwan
authors: G
authors: Seo
authors: Creative Research Center of Metal-Insulator Transition, Electronics and Telecommunications Research Institute , Daejeon 305-700, Republic of Korea.|School of Advanced Device Technology, University of Science & Technology , Daejeon 305-333, Republic of Korea.
authors: Hyun-Tak
authors: HT
authors: Kim
authors: Department of Physics, Oregon State University , Corvallis, Oregon 97331-6507, United States.
authors: Yun-Shik
authors: YS
authors: Lee
authors: Department of Physics and Astronomy and Center for Atomic Scale Electromagnetism, Seoul National University , Seoul 151-747, Republic of Korea.
authors: Dai-Sik
authors: DS
authors: Kim
keywords: high-field; nanoantenna; phase transition; plasmonics; terahertz; vanadium dioxide