Optical Absorption And Photoelectric Conversion Devices Based On The Surface Plasmon Hyperbolic Metamaterials

With the deepening of surface plasmon research and the advances in nanofabrication technology,more and more attention has been paid to the phenomenon of surface plasmon in nanostructured devices.By designing different structure of the devices,the researchers could control the electromagnetic wave in nanoscale by using nano-particle,nano-antenna,nano-grating as well as the composite artificial metal-dielectric metamaterial..The hyperbolic metamaterials,due to its unique characteristic of the hyperbolic dispersion and special ability of the manipulating near-field electromagnetic wave,have a wide application in super-resolution imaging,energy conversion,electromagnetic shielding and other fields.In this paper,we investigated the hyperbolic metamaterials'devices based on surface plasmon phenomenon,and paid more attention to the pyramidal absorbers and hot electron photodetectors.Firstly,we optimized the technology of the array preparation and the transfer of double-pass anodized aluminum oxide template.With the features of well-aligned and non-defect,the large area silver nanoarrays on ITO glass are prepared by the method of high-speed vacuum heating silver plating.Based on this,the hyperbolic metamaterial absorber with pyramid structure was prepared by using ultra-thin AAO as the mask.The metal back-reflection layer and the metal-dielectric layer's thickness,how to affect the optical properties of the hyperbolic metamaterial pyramid absorber,was investigated.Compared with the pyramid structure of pure silver,the metamaterial pyramid structure has good anti-reflection performance in wide spectral range of 300¹100 nm.We also designed a hot electron photodetector with hyperbolic metamaterial of the ITO/MoO₃/Ag?8 nm?/Alq₃?5 nm?/Ag?100 nm?.By studying the effect of Ag-Alq₃ cycles on the detector's optoelectronic performance,it is found that the optical response increases with the larger device cycles'number.And the optical response of this kind of device also increases with the larger device cycles'number in non-absorbing wavelength band of the semiconductor.In addition,the hyperboloid metamaterial hot electron photodetector can work well without applied voltage.In summary of this paper,the potential applications of hyperbolic metamaterial pyramidal absorbers and hot electron photodetectors are prospected,as well as the future research.