基于光子晶体的可见光合波器的设计与研究

发布时间：2018-01-11 12:12

本文关键词：基于光子晶体的可见光合波器的设计与研究　出处：《深圳大学》2015年硕士论文　论文类型：学位论文

【摘要】：激光显示是继黑白显示、彩色显示、数字高清显示之后的第四代显示技术。使用三基色激光光源,需要合波器,使得不同波长的三基色光经过合波器从同一端口输出。光子晶体可见光合波器具有结构紧凑,集成度高的特点,有利于激光光源的微型化和低成本。在激光显示、激光成像、激光照明等领域有着诱人的应用前景,具有重要的科学研究意义和应用价值。本文提出了两种基于光子晶体的可见光合波器,实现了三基色的高效传输。第一种是基于光子晶体线缺陷的可见光合波器。选取激光显示中常用的三个波长:488nm、532nm、635nm为例。利用光子晶体耦合模理论,通过理论分析,计算出不同光波对应的耦合长度,并采用两个光子晶体定向耦合器级联的方式实现可见光波段三个波长的合波。但在设计该器件过程中,如果采用传统的线缺陷结构,观察635nm光波对应的色散曲线,发现该波长只支持一个模式,不能实现在两个光子晶体波导中能量的完全转换。本文通过改变光子晶体线缺陷的宽度来改变其色散曲线,从而使635nm的光波能支持两个模式,为设计光子晶体合波器提供了新的思路。本文采用时域有限差分法对该光子晶体合波器进行模拟研究,并优化了该器件的结构参数。模拟结果为:每一个波长的透射率都能达到90%以上,并且器件尺寸为微米量级。第二种为光子晶体线缺陷和点缺陷相结合的可见光合波器。该合波器主要是利用光子晶体不同点缺陷对不同光波的光子局域来实现的,点缺陷在光子晶体中形成微腔,可以局域相应波长的光波。通过改变点缺陷的半径大小、形状和介电常数就可以改变微腔所对应局域模式的谐振频率。本文主要采用线缺陷与点缺陷相结合,并设置了一个和该微腔结构相同的反射微腔,从而提高其透射效率。采用时域有限差分法对该光子晶体合波器进行模拟研究。模拟结果为透射效率能到86%以上,器件尺寸为微米量级。
[Abstract]:Laser display is a 4th generation display technology after black and white display, color display and digital high-definition display. The three primary color light of different wavelengths is output from the same port through the wave combiner. The photonic crystal visible photosynthetic wave apparatus has the characteristics of compact structure and high integration. It is beneficial to the miniaturization and low cost of laser light source. It has attractive application prospect in the fields of laser display, laser imaging, laser illumination and so on. This paper presents two kinds of visible photosynthetic wave apparatus based on photonic crystal. The first is a visible photosynthetic wave based on photonic crystal line defect. The three wavelengths commonly used in laser display are: 488nm ~ 532 nm. The coupling lengths of different light waves are calculated by using the coupling mode theory of photonic crystals and theoretical analysis at 635nm. Two photonic crystal directional couplers are used to realize the combination of three wavelengths of visible light. However, in the process of designing the device, the traditional linear defect structure is adopted. The dispersion curve corresponding to the 635nm light wave is observed and it is found that the wavelength supports only one mode. It is impossible to realize the complete energy conversion in two photonic crystal waveguides. In this paper, the dispersion curve is changed by changing the width of the photonic crystal line defects, so that the 635nm optical wave can support two modes. It provides a new idea for the design of photonic crystal synthesizer. In this paper, we use the finite-difference time-domain method to simulate the photonic crystal synthesizer. The structural parameters of the device are optimized. The simulation results show that the transmittance of each wavelength can reach more than 90%. And the device size is in the order of micron. The second is the visible photosynthetic wave apparatus which combines the photonic crystal line defect and the point defect. This kind of wave synthesizer is mainly realized by using the photonic localization of different light wave caused by the different point defect of photonic crystal. . Point defects form microcavities in photonic crystals, allowing localized wavelengths of light to be localized by changing the radius of point defects. The shape and dielectric constant can change the resonant frequency of the local mode of the microcavity. In this paper, the linear defect and the point defect are combined, and a reflection microcavity with the same structure is set up. In order to improve the transmission efficiency, the transmission efficiency of the photonic crystal synthesizer is simulated by using the finite-difference time-domain method. The simulation results show that the transmission efficiency is more than 86% and the device size is of the order of micron.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN25

【参考文献】