Mr. Robin Vishen Profile

Robin Vishen

at Delhi Technological Univ

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Proceedings Article | 20 August 2020 Poster + Presentation + Paper

Design and modeling of novel plasmonic switches based on phase change materials

Y. Sharma, S. Jain, R. Vishen, A. Dhawan

Proceedings Volume 11462, 1146232 (2020) https://doi.org/10.1117/12.2571259

KEYWORDS: Reflectivity, Plasmonics, Switches, Gold, Nanostructures, Vanadium, Switching, Thin films

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We present 2-D arrays of plasmonic nanostructures ─ gold nanopillars on a gold coated substrate ─ coated with a thin film of VO₂ (vanadium dioxide), as novel optical switches. The incident optical radiation is coupled into plasmonic modes due to the small gaps between the adjacent nanostructures, which leads to high electromagnetic fields in the gap regions. As VO₂ changes phase from the semiconducting to the metallic phase on heating or on application of voltage, there is a change in the overall plasmonic properties of the VO₂ coated 2-D plasmonic nanostructures, and a change in the reflectance spectra. We employ Rigorous Coupled Wave Analysis (RCWA) to calculate the switchability, i.e., the differential reflectance between the semiconducting and metallic state of the VO₂ coated nanostructures. An exhaustive analysis of the differential reflectance spectra is carried out, by optimizing the different geometrical parameters of the structure. Moreover, we demonstrate that these 2-D arrays of plasmonic nanostructures can be employed for switching with unpolarized light. These nanostructures can also be employed for multi-wavelength switching if a degree of asymmetry is introduced with different gaps or periodicities in the two dimensions. Thus, we propose 2-D VO₂ coated nanostructures which can be employed as plasmonic switches with unpolarized light.

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