Light scattering as a form of modulation spectroscopy

摘要: Abstract In the conventional modulation spectroscopy optical constants of a solid are modulated by means an external parameter (stress, electric field, etc). As result presence elemental excitations in (usually phonons) spontaneous takes place at frequency excitations. This can be observed light scattering experiments (Raman and Brillouin). Such measurements yield information about density states (conventional Raman Brillouin measurements), their interaction with electronic states, transitions themselves (resonant experiments). The theory resonant semiconductors will discussed connection that other (piezoreflectance, stress induced birefringence). Another closely related phenomenon, spatial-dispersion-induced birefringence also presented.