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Dimensional photonic crystal applications in laser radar systems

Author: WangYanRu
Tutor: YangHuaJun
School: University of Electronic Science and Technology
Course: Optics
Keywords: Dimensional photonic crystal Photonic bandgap Filtering Collimation
CLC: TN958.98
Type: Master's thesis
Year: 2010
Downloads: 66
Quote: 0
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Photonic crystals are appeared in recent years, a new kind of optical materials, constituted by the different refractive indices of the media in the periodic changes of the space. It has a unique photonic bandgap characteristics of electromagnetic wave frequency falls within the photonic band gap can not be spread in which to provide a new control mechanism of light, has a broad application prospects. Currently, the study of photonic crystals has become a rapidly developing field of science. With the development of laser radar technology equipment the increasingly urgent miniaturization requirements. Since the photonic crystals can be orders of magnitude in the wavelength control of the light path, the integrated optical device have an important role. Photonic crystal devices to the laser radar system to meet the miniaturization requirements. The main content of the paper include: 1. Starting from the concept of crystals in solid-state physics, leads to the basic theory of photonic crystals. Including the first Brillouin zone, and Bloch theory, based on the basic theory of the electromagnetic wave Maxwell's equations, the derivation of the master equation analysis of photonic crystal. Photonic crystals commonly used analytical methods - the transfer matrix method, plane wave expansion method and time domain finite difference method. Plane wave expansion method to calculate the two-dimensional photonic crystal band structure, analysis of the crystal structure, dielectric cylinder filling ratio and dielectric constant than the photonic bandgap. The introduction of point defects in a two-dimensional photonic crystal line defect, the defect characteristics make discussion. Introduction of the combination of these deficiencies, coupled mode theory analysis of the mutual coupling between the photonic crystal point defects and line defects, a two-dimensional photonic crystal filter design can be applied to a laser radar system (operating wavelength of 1550nm), very narrow line (1.51nm) wide band-pass filtering function. Photonic crystal devices subwavelength structure, the light beam emitted from a photonic crystal waveguide because of the diffraction limit and divergence in all directions, need to be addressed in order to achieve a wide range of applications of photonic crystal devices, photonic crystal functional devices and between traditional optics coupling problem. Based on surface acoustic wave theory, the photonic crystal waveguide exit beam collimated. Discussed compress the outgoing beam divergence angle of two methods: the introduction of the the surface coupled cavity structure and the introduction of the grating structure excitation of surface waves. Finally, the above two methods are designed collimating device of a cascade structure of the two-dimensional photonic crystal, to achieve a compression a beam divergent angle of from 60 ° to 5.56 °, and the analysis of its application in the laser radar.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar: institutional sub- > Optical positioning radar,laser radar
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