Acceleration of carrier-relaxation time in QDs embedded in a photonic crystal waveguide due to the Purcell effect

我们提出利用Purcell效应控制嵌入光子晶体波导（PC-WG）中的自组装量子点（QDs）的载流子弛豫时间。PC-WG模式下的高光子态密度区与量子点中电子跃迁能量的共振将提高自发发射速率，缩短载流子弛豫时间。为了验证共振效应，制作了嵌入不同晶格常数PC-WGs的量子点，并进行了泵浦探针测量。结果发现，当高光子DOS区与量子点的ES发射波长共振时，弛豫时间缩短。

We have proposed to control a carrier relaxation time in self-assembled quantum dots (QDs) embedded in a photonic crystal waveguide (PC-WG) by using the Purcell effect. Resonance of a high photon density-of-states region in the PC-WG mode with the electron transition energy in the QD will increase the spontaneous emission rate and the carrier relaxation time can be shortened. To verify the resonance effect, QDs embedded in PC-WGs with various lattice constants were fabricated and pump-probe measurements were performed. As a result, we found that the relaxation time was shortened when the high photon DOS region resonated with the ES emission wavelength of the QD.