Micro-Nano Optics and Photocatalysis Materials, Devices, and Applications

technical route for constructing new heterojunction photocatalysts.To effectively use solar energy, Xu et al. [1] proposed a design method of asymmetric silicon grating absorbers based on surface plasmon resonance and Fabry-Perot (FP) cavity and used finite difference time domain (FDTD) to simulate the calculation. The influences of geometric parameters, incident and polarization angles on the performance of silicon grating absorbers were discussed in detail. The designed absorber can be potentially used in the field of photon detection, optical filtering and spectral sensing. To achieve solar energy collection, light heat conversion, high sensitive sensing and other functions, Huang et al. [2] designed an ultra-broadband solar absorber on the basis of metal tungsten and semiconductor GaAs structure. By adjusting the geometric parameters, the high efficiency surface plasmon resonance is excited and the ultra-wideband absorption of up to 2350 nm is realized. Similarly, Liu et al. [3] proposed a perfect broadband solar absorber with the structure of GaAs grating-GaAs film-W substrate. The model have been simulated by the finite time domain difference method (FDTD). This structure is thought to be very simple and easy to operate, and can be used in photothermal conversion, collection and utilization of solar energy. Photocatalytic technology is a green technology which has been developed as the environment is polluted and highly valued all over the world. Han et al. [5] reviewed the application of MAl2O4 (M=Mg, Sr, Ba) based photocatalysts in the field of photocatalysis, and summarized the development trend of this kind of catalyst in the future, which can be applied to the synthesis and application of other photocatalysts.Photocatalysts can be used in medicine, especially orthopedic implants, in addition to efficiently degrading dyes, drugs and hard-to-degrade pollutants in the process of efficient utilization of sunlight. Qi et al. [6] studied the application of different types of TiO2-based photocatalysts in the field of photocatalysis and orthopedic implants based on the preparation of TiO2-based photocatalysts. These technologies provide technical support for the study of other semiconductor based photocatalysts for orthopedic implants. Tong et al. [7] constructed ZnFe2O4 based heterojunction photocatalyst by sol-gel method, which showed high photocatalytic activity in photocatalytic degradation of dyes, refractory pollutants and drugs. Chen et al. [8][9][10] and his research group synthesized a variety of semiconductor composites using special preparation methods and investigated their photocatalytic activities of water decomposition to produce hydrogen and dye degradation. The application of these techniques in the field of photocatalysis will promote the further development of photocatalysis.