Red-Green-Blue Colloidal Quantum Dots for Full Spectrum Microlasers

目的：使用基于胶体半导体量子点的单一纳米晶体材料系统穿透整个可见光谱，以开发相干微发射器及其阵列。建议的方法是由两个关键的研究目标指导：（a）产生可紧密粘附在所选衬底和微尺度图案化表面上的高密度紧密堆积量子点薄膜红-绿-蓝光学增益介质的方法，以及（B）将光学微谐振器与量子点介质集成，所述量子点介质结合有高增益介质，以使得能够进行彩色操作。在实际和现实的激发条件下，室温可调谐微激光器。智力优点：在基本层面上，研究的目的是通过研究辐射（受激发射）和非辐射过程之间相互作用的量子点激子态的基本竞争和相互作用，最大限度地提高密集排列的胶体量子点微谐振器的光学增益。在应用层面上，这方面的知识是用来设计低成本的薄膜增益介质，可以图案化和/或共形沉积和集成在光学微腔的微型激光器。 更广泛的影响：基于单一材料的全光谱相干微发射器可以为开发新型像素化激光投影设备提供变革性手段，这是便携式显示器的技术重要成果。PI旨在根据REU方案招募妇女和其他少数民族学生，并将通过布朗与普罗维登斯公立学校系统已经建立的方案，参加与学生和教师的外联活动。研究生将有机会与初创公司合作，以获得将研究过渡到技术的经验。

Objective: To penetrate the full visible spectrum using a single nanocrystalline material system, based on colloidal semiconductor quantum dots, to develop coherent microemitters and their arrays. The proposed approach is guided by two key research objectives: (a) methods to create ultrahigh density closely-packed quantum dot thin film red- green-blue optical gain media which can be tightly adhered on selected substrates and microscale patterned surfaces, and (b) integration of optical microresonators with the quantum dot media which incorporate the high gain medium to enable operation for a color-tunable microlaser at room temperature under practical and realistic excitation conditions. Intellectual merit: At the basic level, research aims to maximize the optical gain in densely packed colloidal quantum dot-based microresonators by investigating fundamental competition and interaction within interacting quantum dot excitonic states between radiative (stimulated emission) and nonradiative processes. At the applied level, this knowledge is employed to design low-cost thin film gain media which can be patterned and/or conformally deposited and integrated within optical microcavities for microscale lasers. Broader impacts: The single material based full spectrum coherent microemitters may offer a transformative means to develop new types pixelated laser projection devices, a technologically important outcome for portable displays. The PI aims to recruit women and other minority students under the REU program and will participate in outreach events with students and teachers through the already established program at Brown with Providence Public Schools system. Graduate students will have opportunity to work with a start-up company to gain experience transitioning research to technologies.