The nanoscale modulation of light can be achieved by integrating plasmonic nanostructures with phase change materials. A dynamic and tunable perfect absorber is designed by combining VO2–Au hybrid nanodisc array with metal–insulator–metal structure. The finite-difference time-domain method is used to simulate the absorption curves under different structural parameters and temperatures. In the near-infrared band of 700 to 1800 nm, the average absorption rate and absorption bandwidth of the absorber in the insulating phase of VO2 are 87.6% and 939 nm, respectively. And the maximum absorption modulation depth before and after phase transition of VO2 reaches 63.8%. The absorber can tolerate a wide range of incident angles and exhibits polarization-independent features. We envisage that the overall advantages of this absorber will open new opportunities for optical modulation and optoelectronics.

中文翻译：

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基于VO2-Au混合纳米圆盘阵列的动态可调完美吸收器

通过将等离子体纳米结构与相变材料相结合，可以实现光的纳米级调制。通过将 VO2-Au 混合纳米盘阵列与金属-绝缘体-金属结构相结合，设计了一种动态可调的完美吸收器。采用时域有限差分法模拟不同结构参数和温度下的吸收曲线。在700～1800 nm的近红外波段，VO2绝缘相中吸收体的平均吸收率和吸收带宽分别为87.6%和939 nm。VO2相变前后最大吸收调制深度达到63.8%。吸收器可以承受很宽的入射角范围，并表现出与偏振无关的特性。