Researches On Two-Dimensional (2D) Photonic Crystal Slabs Devices

In recent years, the self-collimation effect is an important newfound character of photonic crystals. It can steer light beams nearly without diffraction in photonic crystals, and is in the ascendant in fabrication for its low-cost and high-integration. It could be an important step towards developing optical interconnects and optical integration. By means of the plane wave expansion method and the finite-difference time-domain method, we study the self-collimation effect, and design a new type of photonic crystals polarization beam splitter and F-P cavity laser which are based on the self-collimation effect. In this paper, the innovation are as follows:(1)we develop the application of the self-collimation effect in photonic crystal; (2)we study the nonlinear modulation of self-collimation beams.The dissertation consists mainly of the following parts:1. Introducing the role played by photonic crystals in modern communication.2. Introducing two numerical methods: the plane wave expansion method and the finite-difference time-domain method.3. Discussing the phase distribution, the energy flux distribution and the width of the self-collimation beams in the photonic crystal.4. Proposing a polarization beam splitter based on the self-collimation effect. The results indicate that two beams of different polarizations can be split with an extinction ratio of nearly 20dB in a wavelength range of 90nm.5. Proposing a F-P cavity laser based on the self-collimation effect. The results indicate that the F-P cavity can radiate laser beams with the self-collimation frequency and realize nonlinear tunable laser.