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Physics and Astronomy

Physics & Astronomy Colloquium

3:30 PM, Friday, Jan 23, 2015
Room 155, Chem-Phys Building

Dr. Apparao Rao
Clemson University

Graphene Coating-enabled Surface Plasmon Coupled Emission and Optical Diode Action

A single sheet of sp^2-hybridized carbon atoms, called Graphene, is presently one of the most widely studied materials in the scientific community. Following a bried introduction of Graphene and its unique properties, I will present evidence for the amplification of surface plasmon coupled emission (SPCE) from Graphene-Ag hybrid films. SPCE is a novel analytical technique in which the isotropic emission of a fluorophore is combined with the surface plasma resonance of a Ag (or Au) think film to yield highly directional emission from the so-called plasmaphore, and thus greatly increased sensitivity. In another project, we harnessed the nonlinear optical properties of Graphene in conjunction with those of C_60 to fabricate an all-optical analog of a diode. Our all-carbon optical diode, built from a Graphene and C_60 sandwiched structure, is passive, polarization independent and most importantly has no phase-matching constraints. Evidence for tunable nonreciprocity factor and potentially large bandwidth capability with be presented. This work was done in collaboration with team members from Clemson University, USA (M. Karakaya, R. Podila, K. Lingam), Sri Sathya Sai Institute of Higher Learning, India (P. Mulpur, B. Anand, R. S. Satish) and Raman Research Institute, India (R. Philip).

Refreshments will be served in CP 179 at 3:15 PM