Saisai Wang, Jinwei Yao, Zhenya Zhang, Keming Zhang,
https://www.spiedigitallibrary.org/journals/Journal-of-Nanophotonics/volume-13/issue-3/036019/Design-and-numerical-simulations-of-a-temperature-tunable-hybrid-structure/10.1117/1.JNP.13.036019.short
A temperature tunable hybrid metamaterial absorber based on
vanadium dioxide (VO2) particles is proposed
and simulated in the terahertz frequency regime. An absorption peak is achieved
at 6.13 THz at room temperature with maximum absorptivity of 97.3%, which
is derived from the local surface plasma (LSP) mode resonance. The effect of geometric
parameters on the absorption properties is revealed. When the simulated
temperature reaches the phase change point of VO2 particles, the
original absorption peak is enhanced and converted into an absorption band.
Moreover, an absorption peak is achieved. These resonance behaviors are mainly
due to the conversion of VO2 particles into new
resonators in the proposed metamaterial absorber. LSP modes are supported by
these VO2 particles
resonance elements. The absorption band and new absorption peak are enhanced
and shifted to lower frequencies with the simulated temperature increasing. An LC equivalent circuit model is proposed
to understand these resonance absorption behaviors.
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