Fundamental Research on Quantum Microcavity Lasers

在这个研究项目中，我们一直在研究利用量子线/点和光学微腔来完全控制飞蛾电子和光子的量子微腔激光器。首先，我们研究了利用金属有机化学气相沉积(MOCVD)来制备量子线和量子点。我们已经获得了横向宽度小于10 nm的高量子效率的GaAs量子线。光致发光和磁光致发光清楚地表明了量子线效应的存在。光致发光衰减时间的测量表明，激子寿命与量子线的尺寸之间存在相关性。我们还成功地制作了应变InGaAs量子线。此外，我们还用类似的MOCVD方法制备了GaAs点结构。到目前为止实现的最小结构是横向尺寸为25 nm的量子点。其次，研究了微腔效应，以控制激子与微腔模式之间的相互作用。反射率光谱的测量表明，这两个模式之间存在着很强的模式耦合。总之，我们研究了未来量子微腔激光器的基本问题，包括量子线/量子点的制备以及受限激子与受限光子的相互作用。本文的研究结果对进一步研究极限发光体有一定的参考价值。

It is now very important to control completely both electrons and photons for future light emitters to establish systems.In this research project,we have been investigating quantum microcavity lasers in which moth electron and photons are completely controlled by using quantum wires / dots and optical microcavities.First,we investigated fabrication of the quantum wires and dots by MOCVD (Metal Organic Chemical Vapor Deposition). We have obtained GaAs quantum wires with the lateral width of less than 10nm with high quantum efficiency. The photoluminescence and magneto-photoluminescence clearly indicate the existence of the quantum wire effect. The measurement of photoluminescence decay time demonstrates correlation between exciton lifetime and the size of the quantum wire. Strained InGaAs quantum wires are also successfully fabricated. In addition,we fabricated GaAs dot structures using the similar MOCVD method. The smallest structure so far achieved is the quantum dot with the lateral dimension or 25nm. Photoluminescence is obtained from the microstructure.Secondly,microcavity effects are investigated so that the interaction between the exciton and the microcavity mode can be controlled. The measurement of reflectivity spectra demonstrates strong mode coupling between the two mode. This strong mode coupling is corresponding to vacuum-Rabi oscillation.In conclusion,we have studied fundamental issues for future quantum microcavity lasers including fabrication of the quantum wires/dot and interaction between confined excitons and confined photons. The results demonstrated here are useful for further investigation of ultimate light emitters.