Search -
Light Scattering in Solids IX (Topics in Applied Physics) (v. 9)
Light Scattering in Solids IX - Topics in Applied Physics - v. 9 Author:Manuel Cardona Volume IX will be devoted to new materials (nanotubes, quantum dots) and new techniques (synchrotron radiation scattering and cavity confined scattering. In the past five years Raman and Brillouin scattering have taken a place among the most important research and characterization methods for carbon nanotubes. It is beginning to be used for othe... more »r nanotube materials. It is also being used in the investigation of semiconductor quantum dots, in particular collections of them which order self-assemble) automatically as two-dimensional lattices. Among the novel techniques discussed in this volume are those which use synchrotron radiation as light source. Improvements in the intensity and beam quality of modern synchrotron sources fully dedicated to spectroscopic work have made possible their use as sources for light scattering spectroscopy. In the case of scattering by phonons, new methods of beam monochromatization have allowed resolutions better than 10 wave numbers, a fact which has lead to phonon dispersion measurements throughout the whole Brillouin zone. This development has been applied to the measurement of phonon dispersion relations in very small samples (of the order of 1 cubic mm) which cannot be investigated by inelastic neutron scattering. Also, the use of resonant Raman scattering by electronic excitations has allowed the determination of electronic energy bands in a number of materials. Another approach to Raman spectroscopy is to enhance its efficiency by using resonant cavities which are part of the sample. Electromagnetic resonances have been already used for some time. More recently, they have been combined with acoustic resonances to obtain large enhancements in Raman efficiencies.« less