Dr. Stephen K. Gray
Center for Nanoscale Materials (CNM)
Argonne National Laboratory
|TITLE:||"Quantum Dot – Surface Plasmon Interactions"|
|DATE:||Thursday, March 8, 2012|
|PLACE:||Building 212 / A-157|
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 , how a system’s overall photoluminescence can be actively changed by altering the distance between the quantum dot and nanoparticle , and how the quantum dot can induce a transparency in the system .
 M. Liu et al., Phys. Rev. Lett. 102, 107401 (2009).
 D. Ratchford et al., Nano Letters 11, 1049 (2011).
 X. Wu, S. K. Gray, and M. Pelton, Opt. Exp. 18, 23633 (2010).