Super-lattice Effects in Ordered Core-shell Nanorod Arrays Detected by Raman Spectroscopy

A. Alabastri, R. Krahne, A. Giugni, G. Das, R. P. Zaccaria, M. Zanella, I. Franchini, and E. di Fabrizio
Italian Institute of Technology (IIT)
Genoa, Italy

We studied the optical phonon excitations (LO) of ordered arrays of dot/ rod core-shell CdSe/ CdS nanorods by Raman spectroscopy. Upon deposition on planar substrates the nanorods formed super-lattice structures via side-by side assembly into tracks over some microns of length.

COMSOL Multiphysics software has been used to calculate the magnitude of the electric field generated by the interaction of an incident electromagnetic wave with an array of CdSe/CdS nanorods. In particular two configurations were considered: i) localized charges in the nanorods; ii) no localized charges in the nanorods. To this purpose a 2D model has been implemented and simulations have been performed for both polarizations of the incident electromagnetic field.