Open AccessBidirectional current triggering in planar devices based on serially connected VO_2 thin films using 965 nm laser diode
Author(s) -
Jihoon Kim,
Kyongsoo Park,
Bong-Jun Kim,
Yong Wook Lee
Publication year - 2016
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.24.017720
Subject(s) - materials science , laser , optics , diode , pulsed laser deposition , thin film , optoelectronics , planar , current (fluid) , pulse (music) , ultrafast laser spectroscopy , laser diode , physics , computer graphics (images) , detector , computer science , thermodynamics , nanotechnology
By incorporating a 965 nm laser diode, the bidirectional current triggering of up to 30 mA was demonstrated in a two-terminal planar device based on serially connected vanadium dioxide (VO 2 ) thin films grown by pulsed laser deposition. The bidirectional current triggering was realized by using the focused beams of laser pulses through the photo-thermally induced phase transition of VO 2 . The transient responses of laser-triggered currents were also investigated when laser pulses excited the device at a variety of pulse widths and repetition rates of up to 4.0 Hz. A switching contrast between off- and on-state currents was obtained as ~8333, and rising and falling times were measured as ~39 and ~29 ms, respectively, for 50 ms laser pulses.