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Graduate Student Seminar - 03/16/2012

"Enhanced Interaction between Colloidal Quantum Dots and Photonic Crystal Cavities"

by Shilpi Gupta

Friday, March 16, 2012 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Associate Professor Edo Waks

Quantum dots (QDs) are semiconductor nanocrystals that confine electrons and holes on a nanometer size scale. Due to this confinement they exhibit a quantized energy spectrum, much like an atom. They are also good sources of single photons. For these reasons QDs are excellent candidates not only for studying atom-photon interactions but also for the development of lasers, optical interconnects, and basic building blocks for quantum information processing. Chemically synthesized QDs, known as colloidal QDs, are particularly interesting because of their size-dependent emission wavelength, making them attractive gain media for wavelength-tunable lasers. However, these QDs suffer from a fast nonradiative gain decay which hinders lasing. In this talk, I will show that photonic crystal cavities can be used for enhancing the QD-photon interaction to overcome the decay and achieve efficient lasing. I will also describe our recent experimental efforts to realize these enhanced interactions.

For additional information about the IREAP Graduate Student Seminars, contact David Meichle.

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