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- W2891764573 abstract "We theoretically investigate the absorption bistability behavior of a nanostructure consisting of a vanadium dioxide (VO2) layer grown on top of a one-dimensional photonic crystal. The proposed structure is illuminated by a continuous wave pump laser, resulting in heat generation within the VO2 layer, and a subsequent phase transition which drastically affects the optical response of the nanostructure. We solve a multiphysics problem containing electromagnetism and thermodynamics in order to show that the optically induced transitions in the VO2 layer can lead to a bistable response in the nanostructure over some ranges of incident intensities during the VO2 heating and cooling modes. Interestingly, when the laser is well set up for an appropriate wavelength, the high contrast of two absorption values in the hysteresis loop indicates bistability and the possibility of achieving near-unity absorption. For example, considering λ = 1025 nm, we get bistability over 1.182 W/cm2 < I < 1.457 W/cm2 which leads to absorption values of about 0.47 and 0.999 for the heating and cooling modes, respectively. The corresponding heat generation for I = 1.3 W/cm2 is 2.41 × 105 W/cm3 and 3.52 × 105 W/cm3, respectively. These properties make our structure promising for designing tunable VO2-based absorbers and optical switching devices." @default.
- W2891764573 created "2018-09-27" @default.
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- W2891764573 date "2018-09-03" @default.
- W2891764573 modified "2023-10-14" @default.
- W2891764573 title "Modeling photothermal induced bistability in vanadium dioxide/1D photonic crystal composite nanostructures" @default.
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- W2891764573 doi "https://doi.org/10.1063/1.5040365" @default.
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