Research On The Filtering Characteristics Of Silicon Nanobrick Arrays

Optical filter devices,which can be used to split an incident light or select desired waves according to incident waves' differences in wavelength,amplitude,or polarization states,are widely applied in optical fiber communications,photoelectric imaging,photoelectric detection and other fields.With the rapid development of the information technology,the industry put forward higher and higher requirements to the integration of optoelectronic systems.Similar to the "integrated circuit",it has now appeared what so called "photon integration".It is required in photonic integration that the size of optoelectronic devices should be reduced to be at micron or nanometer levels,which is extremely hard for conventional optical filter devices based on natural birefringent crystals or multilayer dielectric films.Therefore,exploring optical filter devices in highly integration based on new materials has become an urgent development target.Metasurface is a kind of artificial sub-wavelength structure materials based on new working principle.Its unique electromagnetic response characteristics are expected to provide a new way to realize high performance and highly integrated filter device.Based on the research of silicon nanobrick arrays,we systematically carried out a series of research works including studying the mechanism and principle,method,characteristic of filtering optic waves with silicon nanobrick arrays and designing related devices.The main contents of this paper include the following aspects:In the first chapter,the background of metamaterial technology,the dilemma of traditional optical filter devices and the development trends of metasurfaces are discussed in detail,which clarifies the meaning and background of the fact that why silicon nanobrick arrays is chosen as the new material to form optical filtering device.In the second chapter,the effective medium theory,the phase manipulation and the Mie resonance of dielectric metasurfaces are illustrated in detail,thus the theoretical basis is established for the study of the filter characteristics of silicon nanobrick arrays.In the third chapter,based on the anomalous reflection phenomenon of the dielectric silicon nanobrick arrays and the Mie resonant theory of the metasufaces,the simulation model of the silicon nanobrick array cell structure was established by CST Microwave Studio software and COMSOL.Based on this model,the cell structure of polarization beam splitter was optimally designed.After that,the relationship between the dimension of the silicon antennas and the response wavelength of the silicon nanobrick arrays was analyzed.Finally,the influence of the length,width and arrangement error of the nanobrick antenna on the filtering performance of the device was analyzed by using the simulation model.These works provide the basis for the design of the silicon nanobrick arrays filter devices.In the fourth chapter,based on silicon nanobrick arrays,a polarizing beam splitter device illuminated by incident wave impinging with 45 degrees was designed,and the causes and characteristics of the resonant attenuation peak of this splitter were discussed in detail.After that,we designed the antireflective and high reflection films based on silicon nanobrick arrays and the characteristics of broad bandwidth and high efficiency of this new device were analyzed.In addition,we explored the way to achieve phase control and polarization splitting simultaneously,and a multi-channel polarization control device was developed and its possible working conditions was analyzed.Potential application of polarization splitting device based on silicon nanobrick arrays in polarization camera was explored at last.The design work of the dielectric silicon nanobrick array device verifies the effectiveness of the research on the filter characteristics based on silicon nanobrick arrays.In chapter 5,the main work finished in this paper was summarized and the prospect for future research was discussed.