Studies on Metallo-Dielectric Nanostructures

When: Monday, October 17, 2011 at 3:00 pm
Where: EG 306
Speaker: Dr. Achanta Venugopal
Organization: Tata Institute of Fundamental Research, Mumbai, India
Sponsor: Special NanoGroup Seminar

Nano-patterning and nano-assembly have been exciting topics of frontier research for quite some time now. The top-down and bottom-up approaches have been used to study the material properties as well as for numerous applications. In this talk, I will describe our activities in the area of single quantum dots, photonic crystals and plasmonics. In particular, after a brief introduction to the facilities available, I will present some of our results in related areas such as measurements on single quantum dots to address some of the basic issues for example, the origin of excitation induced dephasing in single quantum dots and the origin of inhomogeneity in Mn-doped CdS quantum dots. We have fabricated magneto-plasmonic crystals by combining gold nano-patterns and ferromagnetic Bi:YIG films. In these structures, a three orders of magnitude enhancement in transverse magneto-optical Kerr effect (TMOKE) has been observed in transmission geometry when compared with unpatterned films. These results show the potential of nanopatterned magneto-plasmonic structures to achieve MO effects strong enough for device applications. An interesting outcome of the TMOKE measurements is that TMOKE can be used as a very high sensitive tool to identify the surface plasmon polariton resonances.