结构周期数对光量子阱透射品质的影响研究

Effect of Structure Period Number on the Transmission Quality of Photonic Quantum Well

用传输矩阵法理论研究结构周期数对单势垒和双重势垒一维光量子阱透射品质的影响。结果表明:随着阱层周期数的增加,单势垒和双重势垒光量子阱的透射峰均变窄,即品质因子提高,且双重势垒光量子阱透射品质因子提高的速度更快;随着垒层周期数的增加,单势垒、双重势垒光量子阱的透射峰迅速变精细,即透射品质因子迅速提高,且双重势垒光量子阱透射品质因子提高速度快;垒层周期数影响强度明显高于阱层周期数,当垒层周期数增大到一定数值后,双重势垒光量子阱的透射峰品质因子趋于无穷大,亦即光量子阱的各透射峰趋于某个频率点。这些特性可为光子晶体设计新型高品质的光学滤波器等量子光学器件提供指导。

The effect of structure period number on the transmission quality of one-dimensional photonic crystal with single-and double-barrier quantum well is studied with the transfer matrix method. The result shows that the transmission peaks of the photonic crystal with both single-barrier and double-barrier quantum well turn narrower with increase of the period number of well layer. So to speak, quality factors increase under this circumstance and the one of photonic crystal with double-barrier quantum well increases faster. Transmission peaks rapidly sharpen when the period number of barrier layer becomes greater. That is to say, quality factors rise quickly and the one of photonic crystal with double barrier quantum well rises fastest. The effect of the periodicity of barrier layer on the transmission quality is obviously stronger than the one of well layer. When the periodicity of barrier layer keeps increasing and reaches a certain value, the quality factor of transmission peaks at the double barrier well tends to be infinity. In other words, the transmission peaks become sharp to a certain frequency. These characteristics provide guidance for designing new quantum devices such as optical filter of high quality.