Surface-emitting red, green, and blue colloidal quantum dot distributed feedback lasers

Kwangdong Roh, Cuong Dang, Joonhee Lee, Songtao Chen, Jonathan S. Steckel, Seth Coe-Sullivan, Arto Nurmikko

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

We demonstrate surface emitting distributed feedback (DFB) lasers across the red, green, and blue from densely packed colloidal quantum dot (CQD) films. The solid CQD films were deposited on periodic grating patterns to enable 2nd-order DFB lasing action at mere 120, 280, and 330 μJ/cm2 of optical pumping energy densities for red, green, and blue DFB lasers, respectively. The lasers operated in single mode operation with less than 1 nm of full-width-half-maximum. We measured far-field patterns showing high degree of spatial beam coherence. Specifically, by taking advantage of single exciton optical gain regime from our engineered CQDs, we can significantly suppress the Auger recombination to reduce lasing threshold and achieve quasi-steady state, optically pumped operation.

Original languageEnglish
Pages (from-to)18800-18806
Number of pages7
JournalOptics Express
Volume22
Issue number15
DOIs
StatePublished - 2014

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