Efficient multi-exciton emission from quantum dots.

Abstract

The fundamental spontaneous emission rate an emitter can be modified by its photonic environment. By enhancing the spontaneous emission rate, there is a possibility of extracting multi-exciton energies through radiative decay. In this report, we explore using high Q and small volume cavities to enhance the spontaneous emission rate. We observed greater than 50 folds enhancement in the spontaneous emission from photonic crystal waveguide or microcavity using close-packed monolayer of PbS quantum dot emitters. 4 ACKNOWLEDGMENTSThe successful completion of this project is the result of the efforts of many people: Ihab ElKady, Mehmet Su, and Bernardo Farfan for performing FDTD numerical simulations; Jeff Brinker and Shisheng Xiong for developing integration techniques to transfer or embed QDs into 2D and 3D photonic crystal; Paul Resnick for fabricating 2D and 3D photonic crystal; Weng Chow for scientific guidance and simulating discussions; Ganesh Subramania, Mike Sinclair, Rohan Ketatpure, Xiaoyu Miao, Alon Gabbay and Art Fischer for discussions and helping in experimental data interpretation in this project.5