有源光子带隙高速全光开关的研究

The Investigation of the All-optical Switch on the Active Photonic Band Gap

研究了一种新颖的基于非共振光学斯塔克效应的有源光子带隙全光偏振开关的理论模型,模拟了在抽运光作用下全光开关有源光子带隙的反射谱的变化情况;反射式全光偏振开关的对比度随延迟时间和抽运功率密度的变化以及插入损耗随延迟时间的变化;周期无序和折射率测量误差对光子禁带的影响。由于超辐射模的快速辐射衰减,在非共振抽运脉冲通过后,材料光谱特性将迅速恢复,可形成太赫兹的开关;并且材料的光子禁带对激子共振频率的变化非常敏感,使得光开关控制光能量比普通多量子阱光开关的小很多。

In this paper, a theoretical model of the novel all-optical polarization switch based on nonresonant Stark effect active photonic band gap was investigated. The change of active photonic band gap reflection spectra of the alloptical switch under the pump pulse was simulated; the contrast ratio as a function of control-signal delay and pump pulse intensity, the impact of disorder in the periodicity of the quantum wells and the drift of refractive index on the formation of the resonant photonic band gap were simulated also. Furthermore, due to the fast attenuation the superradiant mode, the sample fully recovers after the passage of the pump pulse for near-resonant pumping, making possible a switch with terahertz bandwidth. The active photonic band gap is very sensitive to the change of the exciton resonant frequency, so the pump pulse energy of the switch is small than that of the normal quantum wells switch.