论文部分内容阅读
超声波在介质中传播时可以引起介质的折射率发生周期变化,当光波垂直于超声波的传播方向时,这种介质可以被用来作为光栅使用,称为超声光栅。当光波沿超声波的传播方向通过这种介质时,它还可以用作一维光子晶体,并称其为一维超声光子晶体(1D-USPC)。利用平面波法证明了一维超声光子晶体具有一般一维周期层叠结构光子晶体的禁带特征。同时这种光子禁带是可以通过超声波的波长和振幅来改变的,这就为控制光的行为方面提供另一种新的方法。
When the ultrasonic wave propagates in the medium, the refractive index of the medium can cause periodic change. When the light wave is perpendicular to the propagation direction of the ultrasonic wave, the medium can be used as a grating and is called an ultrasonic grating. It can also be used as a one-dimensional photonic crystal as it passes through the medium in the ultrasonic propagation direction and is referred to as one-dimensional ultrasonic photonic crystal (ID-USPC). The plane wave method is used to prove that the one-dimensional ultrasonic photonic crystals have the band gap characteristics of general one-dimensional periodic laminated photonic crystals. At the same time, this photon band gap can be changed by the wavelength and amplitude of the ultrasonic wave, which provides another new method for controlling the behavior of the light.