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Single-Layer Coupled Quantum Dot Lattices

Friday, October 5, 2018, 11:00 AM
Nedderman Hall 109

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Photonics Distinguished Speaker Seminar Series

Professor James J. Coleman
Member of the US National Academy of Engineering
Jonsson School Distinguished Chair
University of Texas at Dallas

III-V semiconductor nanostructures, and especially quantum dots, are becoming ever more important for emerging photonic devices. Quantum dot structures have been obtained in various ways, including self-assembly, nanoscale etching and selective-area growth. Previous work on inverted quantum dot structures has shown that the crystal-like periodicity introduces potentially useful changes in the energy band structure including sharp, high-density states above the ground state. In this work we outline and compare various processes for obtaining engineered quantum dots and novel inverted quantum dot structures. We explore this structure for two dimensions and consider possible ways to extend it to three.

James J. Coleman received his degrees in electrical engineering from the University of Illinois, Urbana. After working at Bell Laboratories, Murray Hill and Rockwell International, Anaheim he returned to the University of Illinois where he was professor of Electrical and Computer Engineering and held the Intel Alumni Endowed Chair. He and his students were the first group to define experimentally the ranges of wavelength, threshold current density, and reliability of 980 nm strained-layer InGaAs lasers. They made contributions to narrow linewidth DBR lasers, integrated lasers and other photonic devices by selective-area epitaxy, and the growth processes for quantum dot lasers. In 2013, he joined the University of Texas at Dallas where he holds the Jonsson School Distinguished Chair. Professor Coleman has published more than 600 journal and conference publications, 13 book chapters, and ten US patents. Among his honors are the John Tyndall Award, the IEEE David Sarnoff Medal, and the OSA Nick Holonyak, Jr. Award. He is a member of the US National Academy of Engineering and a Fellow of the IEEE, OSA, SPIE, and APS.

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