MATERIALS SCIENCE COLLOQUIUM
| SPEAKER: |
Dr. Stephen K. Gray Center for Nanoscale Materials (CNM) Argonne National Laboratory |
| TITLE: | "Quantum Dot – Surface Plasmon Interactions" |
| DATE: | Thursday, March 8, 2012 |
| TIME: | 11:00 a.m. |
| PLACE: | Building 212 / A-157 |
| HOST: | TBA |
Refreshments will be served at 10:45 a.m.
ABSTRACT: I discuss theoretical predictions of how quantum dots (QDs) interact with plasmonic systems (e.g. metal nanoparticles). The QD is treated either as a dipole emitter, as an effective, polarizable medium, or with a quantum mechanical density matrix approach. The combined system is modeled with computational electrodynamics. The presence of the quantum dot can significantly alter the optical response of the system. I show how the quantum dot emission can excite dark plasmon modes, i.e., modes that cannot be excited by ordinary light [1], how a system’s overall photoluminescence can be actively changed by altering the distance between the quantum dot and nanoparticle [2], and how the quantum dot can induce a transparency in the system [3].
[1] M. Liu et al., Phys. Rev. Lett. 102, 107401 (2009).
[2] D. Ratchford et al., Nano Letters 11, 1049 (2011).
[3] X. Wu, S. K. Gray, and M. Pelton, Opt. Exp. 18, 23633 (2010).
