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20 mA bidirectional laser triggering in planar devices based on vanadium dioxide thin films using CO(2) laser
Optics Express
|June 16, 2015
Summary
Researchers demonstrated bidirectional laser triggering in a vanadium dioxide (VO2) device using a CO2 laser. This photo-thermal effect enabled significant current switching, showing potential for optical control applications.
Area of Science:
- Materials Science
- Electrical Engineering
- Optoelectronics
Background:
- Vanadium dioxide (VO2) exhibits a metal-insulator transition with significant resistance changes.
- Optical control of electronic devices offers unique functionalities for advanced applications.
Purpose of the Study:
- To demonstrate bidirectional laser triggering in a two-terminal VO2 device.
- To investigate the photo-thermal switching characteristics of VO2 thin films.
- To analyze the transient responses of laser-induced current switching.
Main Methods:
- Utilizing a CO2 laser (~10.6 μm) as an optical stimulus.
- Fabricating a two-terminal planar device with a highly resistive VO2 thin film.
- Measuring break-over voltage, current switching, and transient responses under laser illumination.
Main Results:
- Achieved bidirectional current switching up to 20 mA via photo-thermal effect.
- Measured a high break-over voltage of ~294.8 V due to high VO2 resistivity and large electrode separation.
- Observed a maximum switching contrast of ~7067 with fast switching times (~30 ms rising, ~16 ms falling).
Conclusions:
- The VO2 device exhibits robust bidirectional laser-triggered switching capabilities.
- The photo-thermal effect in VO2 is effective for optical control of current.
- Demonstrated potential for VO2-based devices in optical switching and control applications.
