Nanomaterials Group, University of Southampton

Nanomaterials Group

Resonance Raman

Resonance Raman Spectroscopy (RRS) involves the measurement of Raman spectra as a function of the energy of the exciting laser. At it simplest it allows the enhancement of Raman signals making them easier to observer. In addition it can allow Raman spectrosopy to explore excitation in a material which are so called Raman forbidden and thus which cannot normally be observed.

More importantly it allows us to determine the strength of interaction between high frequency optical excitaitons of the system under observation with the low energy excitations normally probed by Raman spectroscopy. For instance it has be used to determine the strength of deformation potential scattering of excitons by phonons in semiconductors. Finally in the case of many one dimensional nanostructures it is key technique for measuring optical transisiton energies. 

 Our laboratories can perform RRS in the spectral ranges 370-470nm and 570-990nm on samples held in a cryostat (3-300K) and a heated microscope stage (300K-600K). The system is equiped with a standard microscope for sample observation, a sub micron resolution translation stage and can perform mapping RRS with micron resolution.