Abstract
Active plasmonic switches with broadband operating range are proposed based on arrays of gold nanodisc-dimers (NDD) with asymmetry in terms of sequentially increasing diameters, in combination with vanadium dioxide (VO<sub>2</sub>) as a phase change material. On exposing light, voltage, or heat the layer of VO<sub>2</sub> changes its state from semiconductor to metal. This transition causes considerable changes in the optical characteristics which subsequently alters the reflectance spectra of the designed NDD based plasmonic switches. Thus, efficient broadband switching with high extinction ratios is obtained over a vast wavelength ranges in the near-infrared spectrum. These switches can be employed as the elementary devices in optical networks or can also be used as switching components in integrated photonic circuits.
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