Vanadium dioxide (VO2) is a correlated electron material which undergoes an insulator-metal transition proximal to room temperature. The large change of optical properties across this phase transition is promising for tunable optical and optoelectronic devices especially at infrared frequencies. We demonstrate the ability to locally tune the optical properties on the micron scale through a simple design consisting of two electrodes patterned on a VO2 thin film. By current injection between the electrodes, a localized conducting path (metallic phase) can be formed within the insulating background. The width of the conducting path can be controlled by varying the applied current. Fourier transform infrared imaging shows that this current-modulated reflectance changes significantly over a distance on the order of the wavelength in the mid-infrared spectral range.
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24 November 2014
Research Article|
November 25 2014
Current-modulated optical properties of vanadium dioxide thin films in the phase transition region
Shuyan Zhang;
Shuyan Zhang
School of Engineering and Applied Sciences, Harvard University
, Cambridge, Massachusetts 02138, USA
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Mikhail A. Kats;
Mikhail A. Kats
School of Engineering and Applied Sciences, Harvard University
, Cambridge, Massachusetts 02138, USA
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Yanjie Cui;
Yanjie Cui
School of Engineering and Applied Sciences, Harvard University
, Cambridge, Massachusetts 02138, USA
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You Zhou;
You Zhou
School of Engineering and Applied Sciences, Harvard University
, Cambridge, Massachusetts 02138, USA
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Yu Yao;
Yu Yao
School of Engineering and Applied Sciences, Harvard University
, Cambridge, Massachusetts 02138, USA
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Shriram Ramanathan;
Shriram Ramanathan
School of Engineering and Applied Sciences, Harvard University
, Cambridge, Massachusetts 02138, USA
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Federico Capasso
Federico Capasso
a)
School of Engineering and Applied Sciences, Harvard University
, Cambridge, Massachusetts 02138, USA
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Shuyan Zhang
Mikhail A. Kats
Yanjie Cui
You Zhou
Yu Yao
Shriram Ramanathan
Federico Capasso
a)
School of Engineering and Applied Sciences, Harvard University
, Cambridge, Massachusetts 02138, USA
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
Appl. Phys. Lett. 105, 211104 (2014)
Article history
Received:
October 14 2014
Accepted:
November 16 2014
Citation
Shuyan Zhang, Mikhail A. Kats, Yanjie Cui, You Zhou, Yu Yao, Shriram Ramanathan, Federico Capasso; Current-modulated optical properties of vanadium dioxide thin films in the phase transition region. Appl. Phys. Lett. 24 November 2014; 105 (21): 211104. https://doi.org/10.1063/1.4902924
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