研究目的
Investigating the dynamically tunable perfect absorption based on the phase transition of vanadium dioxide with aluminum hole arrays.
研究成果
The study demonstrates a novel switchable metamaterial perfect absorber by hybridizing the plasmonic resonances of Al rings and the optical cavity modes of VO2 resonators. It shows a wavelength-tunable characteristic at VIS and NIR wavelengths because of the huge contrast in the refractive index of VO2 between insulator and metallic phases. The design also exhibits a strong electromagnetic field concentration as well as high absorptive performance independent of the incident angle and polarization.
研究不足
The study is limited to the visible and near-infrared spectral ranges and the performance of the absorber is dependent on the structural parameters such as the height and radius of the ring disk as well as the period of lattice.
1：Experimental Design and Method Selection:
The study employs a perfect absorber (PA) consisting of aluminum (Al) ring array intercalated with vanadium dioxide (VO2) disk. The numerical calculations with the finite-difference time-domain (FDTD) method are adopted to simulate the absorption spectra.
2：Sample Selection and Data Sources:
The proposed structure is a hexagonal array of Al disks interacted with VO2 as resonator placed on the top and Al substrate at the bottom.
3：List of Experimental Equipment and Materials:
The materials used include aluminum (Al) and vanadium dioxide (VO2).
4：2).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The PA structure is illuminated by a linearly polarized plane wave. The reflection is monitored by a power monitor behind the radiation source. A unit cell of the investigated structure is simulated by using periodic boundary conditions in the x-y plane, and perfectly matched layers are applied to the axis of propagation of the EM waves (z axis).
5：Data Analysis Methods:
The absorption efficiencies are calculated by using different refractive indices of VO2 in different phase states.
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