[MOS] November 19, 2013, Apparao M.Rao, Clemson University

[Zina M Queen]

Seminar on 

Modern Optics and Spectroscopy

 

Graphene coating-enabled surface plasmon coupled emission and optical aiode action 

Apparao M. Rao,

Clemson University

 

Tuesday, November 19, 2013 

12:00 – 1:00 p.m.

A single sheet of sp2-hybridized carbon atoms, called graphene, is presently the most widely studied material in the scientific community.  Following a brief introduction of graphene and its unique properties, I will present strong 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) thin film to yield highly directional emission from the so-called plasmaphore, and thus greatly increased sensitivity. We find a 40-fold amplification of rhodamine b fluorophore when graphene is used as the spacer layer in a conventional Ag-based SPCE setup. In another project, we harnessed the nonlinear properties of graphene in conjunction with those of C60 to fabricate an all-optical analog of a diode. Our all-carbon optical diode, built from graphene and C60 sandwiched structure, is passive, polarization independent and most importantly has no phase-matching constraints. Evidence for tunable nonreciprocity factor and potentially large bandwidth capability will be presented.

This work was done in collaboration with team members from Clemson University, USA (R. Podila, K. Lingam), Sri Sathya Sai Institute of Higher Learning, India (P. Mulpur, B. Anand, R. S. Sathish) and Raman Research Institute, India (R. Philip)

 

Grier Room, MIT Bldg 34-401

Refreshments served after the lecture


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