Charles Cherqui (Schatz Group) - CaSTL Seminar

BIO SUMMARY:

Dr. Cherqui has undergraduate degrees in Physics and Mathematics from Loyola University Chicago. In 2014, as a Los Alamos graduate fellow, he received his Ph.D. in Physics from the University of New Mexico for exploring the effects of quantum and classical dynamical image forces on the transport properties of energy and charge transport in nanoscale systems. As a postdoctoral fellow at the University of Washington, he worked on the use of electron energy loss spectroscopy in the study of localized surface plasmon supporting nanoparticles and in 2017, joined the Schatz group at Northwestern University to continue his work in the field of plasmonics. 

Abstract:

Strong coupling between organic molecular dipolar emitters and localized surface plasmon (LSP) supporting nanoparticles has been studied extensively in the last few years. In particular, the interaction between LSPs and a high density of emitters has been shown to lead to strong coupling effects where both the emitters and LSPs can coherently exchange energy, leading to a shift in the resonant frequencies of both systems in addition to modulation of their decay dynamics. Here, we show that a J-aggregate shell consisting of TDBC molecules form a shell around Ag nanoprisms, leading to Rabi frequencies as high as 400 meV. Moreover, the SERS signal of the same TDBC molecules can be studied in conjunction with the strong coupling effect, yielding some counter-intuitive results. Also being presented are some preliminary results on the CaSTL award funded collaboration between the Schatz group at Northwestern and the Shumaker-Parry group at the University of Utah on the near-field and enhancement properties of chiral plasmonic nanosystems.