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As a typical wide bandgap semiconductor, ZnO has received a great deal of attention from researchers because of its strong physicochemical characteristics. During the past few years, great progress has been made in the optoelectronic applications of ZnO, particularly in the photocatalysis and photodetection fields. To enable further improvements in the material’s optoelectronic performance, construction of a variety of ZnO-based composite structures will be essential. In this paper, we review recent progress in the growth of different ZnO–graphene nanocomposite structures. The related band structures and photocatalysis and photoresponse properties of these nanocomposites are discussed. Additionally, specific examples of the materials are included to provide an insight into the common general physical properties and carrier transport characteristics involved in these unique nanocomposite structures. Finally, further directions for the development of ZnO–graphene nanocomposite materials are forecasted.

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In this paper, four equal-intensity laser output is described by reflective grating under normal incidence. When the duty cycle is 0.32 and the period is 3465 nm, the grating structure is analyzed by a rigorous coupled-wave method, where a good four-output beam-splitter effect can be obtained. Each reflective efficiency of the four orders is more than 20% for metasurface structure with a silver plate. The optimized results show that the grating has good performance and good application value in the field of multi-channel laser devices. In addition, the coupling mechanism of four-output reflective gratings can be well explained by the study of overlapping integral and field distribution.