1Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044 2Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044
Abstract：A tunable perfect absorber composed of hexagonal-arranged aluminum nano-disk array embedded in the vanadium dioxide (VO$_{2}$) film is proposed. The aim is to achieve the tunability of resonance absorption peak in the visible and near-infrared regimes. Numerical results reveal that the absorption peak achieves a large tunability of 76.6% while VO$_{2}$ undergoes a structural transition from insulator phase to metallic phase. By optimizing the structural parameters, an average absorption of 95% is achieved from 1242 to 1815 nm at the metallic phase state. In addition, the near unity absorption can be fulfilled in a wide range of incident angle (0$^{\circ}$–60$^{\circ}$) and under all polarization conditions. The method and results presented here would be beneficial for the design of active optoelectronic devices.
Boardman A D, Grimalsky V V, Kivshar Y S, Koshevaya S V, Lapine M, Litchinitser N M, Malnev V N, Noginov M, Rapoport Y G and Shalaev V M 2011 Laser Photon. Rev.5 287
2019, Vol. 36 
