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. 2021 Aug 5;11:15863. doi: 10.1038/s41598-021-95429-1

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© The Author(s) 2021

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Absorption of the unit cell (red solid line) and of only the VO₂ nanogap region in the unit cell (red dashed line) and the electric field intensity enhancement in the VO₂ nanogap (blue dashed line). The inset illustrates the cross-sectional electric field distribution at the resonance wavelength, 9.05 μm.