It is proved experimentally that the momentum of phonon polaritons generated by impulsive excitation has to be calculated using the same formula as for the case of long-pulse coherent anti-Stokes Raman scattering experiments. Attention is also drawn to the fact that, contrary to the common belief, the generated phonon polaritons are not exactly counterpropagating.
|Number of pages||3|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Jan 1 2002|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics