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On Thermally Controlled Light Propagation in Plasmonics Waveguide and Filter


Affiliations
1 Department of Physics, Faculty of Science, Razi University, Kermanshah,, Iran, Islamic Republic of
2 Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
 

An active ultra-compact plasmonic waveguide composed of a subwavelength slit and perforated in Vanadium Dioxide (VO2) followed by a metallic layer is proposed and numerically analyzed. Refractive index variation of VO2 by external stimuli provides a feasible way for tuning the optical properties of the waveguide. Varying the refractive index of VO2 corresponds with changing the phase of VO2 to the metallic state (“on” state). Consequently, the entire structure becomes a typical Metal-Insulator-Metal (MIM) waveguide that routes the incident light through the slit. In addition, during the “off” state, the incident light thereby propagates in the slit and VO2 medium and mitigates rapidly. By adding a MIM waveguide attached to the Fabry-Perot (FP) cavity, spectrally wide stopband and passband filtering features in the telecommunication frequency regime are demonstrated. Tailoring the resonance wavelength can be performed through the geometrical parameters. Such active plasmonic waveguides with high transmission, coupling, and compact size can be utilized in future fully integrated all plasmonic chip technology.

Keywords

Plasmonics; Waveguide; Filter; Vanadium dioxide.
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  • On Thermally Controlled Light Propagation in Plasmonics Waveguide and Filter

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Authors

Mehdi Afshari-Bavil
Department of Physics, Faculty of Science, Razi University, Kermanshah,, Iran, Islamic Republic of
Nader Daneshfar
Department of Physics, Faculty of Science, Razi University, Kermanshah,, Iran, Islamic Republic of
Dong Liu
Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China

Abstract


An active ultra-compact plasmonic waveguide composed of a subwavelength slit and perforated in Vanadium Dioxide (VO2) followed by a metallic layer is proposed and numerically analyzed. Refractive index variation of VO2 by external stimuli provides a feasible way for tuning the optical properties of the waveguide. Varying the refractive index of VO2 corresponds with changing the phase of VO2 to the metallic state (“on” state). Consequently, the entire structure becomes a typical Metal-Insulator-Metal (MIM) waveguide that routes the incident light through the slit. In addition, during the “off” state, the incident light thereby propagates in the slit and VO2 medium and mitigates rapidly. By adding a MIM waveguide attached to the Fabry-Perot (FP) cavity, spectrally wide stopband and passband filtering features in the telecommunication frequency regime are demonstrated. Tailoring the resonance wavelength can be performed through the geometrical parameters. Such active plasmonic waveguides with high transmission, coupling, and compact size can be utilized in future fully integrated all plasmonic chip technology.

Keywords


Plasmonics; Waveguide; Filter; Vanadium dioxide.

References