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Laser-Regulated 60 mA Current Switching in VO₂-Based Two-Terminal Device Using 976 nm Laser Diode.
Journal of Nanoscience and Nanotechnology 2019 March 2
By incorporating a high-power 976 nm laser diode (LD), we demonstrated laser-regulated current switching in a two-terminal planar device based on a vanadium dioxide (VO₂) thin film. The VO₂ thin film was grown by pulsed laser deposition method and etched to sub-millimeter dimension for the fabrication of a two-terminal device. The reversible current switching was implemented by controlling the on/off state of the LD, which illuminates the VO₂-based device. The transient responses of the device currents were analyzed when the device was excited with laser pulses of various repetition rates of up to 5.0 Hz with a pulse width fixed as 75 ms. A switching contrast between off- and on-state currents was calculated as ~9530, and average rising and falling times were measured as ~31 and ~21 ms, respectively.
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