Project Details
Projekt
Spectroscopy of excitions in single nanorods
Applicant
Professorin Dr. Ulrike K. Woggon
Subject Area
Experimental Condensed Matter Physics
Term
from 2006 to 2011
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 25862426
Semiconductor nanostructures with anisotropic optical and electronical properties present an important material class for bottom-up design of nanodevices and optical functionalization of hybrid optically active/passive nanostructures. This project is aimed at the investigation and understanding of dimensionality and directional dependencies of excitonic elementary excitations in single nanorods as a prerequisite for using them, e.g., in nanorod-based complexes for application purposes and fundamental physics. The focus is on the peculiar high degree of linearly polarized emission in wurtzite-type nanorods. The symmetries and wave functions of excitons in colloidal CdSe nanorods, the excitonic fine structures, the radiative lifetime, the density of states as well as interaction with other elementary excitations (phonons, charged excitons, biexcitons) will be studied by spectroscopy on a single nanorod level with temperature, excitation energy, pump power, nanorod size and shape, ZnS shell thickness and shape, nanorod environment and growth regimes as external parameters. To understand the specific action of highly polarized, oriented emitters with close-lying energy states of different symmetry (the nanorods) in functional nanoensembles, we study nanorods in more complex structures, such as ensembles of aligned nanorods, nanorod/dye and nanorod/metal wire complexes and determine electronic coupling, energy transfer, light conversion and mutual excitation inside the complexes.
DFG Programme
Priority Programmes
