含负折射率缺陷的光量子阱的透射特性及理论模拟

Theoretical Simulation and Transmission Properties of One-Dimensional Photonic Quantum-Well Structure Containing Defect Layers with Negative Refractive Index

利用转移矩阵方法对含负折射率缺陷的一维光子晶体量子阱结构的透射特性进行了研究。结果表明,当缺陷为偶数个时,结构透射谱中有两个透射峰;当缺陷为奇数个时,透射谱中只有中心处一个透射峰,且随着缺陷层数的增加,该处峰的品质因子逐渐提高。因电磁波在缺陷处的强烈局域,所以阱中局域态的透射率对缺陷的折射率有很强的依赖作用。通过控制入射光的强度可使缺陷的折射率发生微小的改变,进而使局域态的透射率发生明显改变,这样就可制作高效光开关。

By using transfer-matrix method, the transmission properties of a one-dimensional photonic quantumwell structure containing defect layers with negative refractive index are studied. It is found when the number of defects is even, there are two transmission peaks in the photonic quantum well, and when the number is odd, only one transmission peak appears in the center frequency. The Q factor of the transmission peak in the center frequency advances when defect layers increase. Due to the strong localization of electromagnetic wave at defect regions, the transmission of confined states are greatly dependent on the refractive index of the defects. The refractive index of the defects is changed slightly by controlling light intensity, then the transmission of confined states is changed obviously. High-efficiency optical switches can be realized by using this property.