In the study of tunable microcavities, the photonic crystal band structures for the ellipse-rod-defects waveguides are calculated. The ellipse rods are rotated to switch the tunable microcavities.

• 在可以充光与放光的可调的微共振腔方面，首先我们先求出椭圆柱的光子晶体频带结构，利用椭圆柱旋转所造的缺陷，我们可以充光和放光。