Coherent phonon dynamics in micro- and nanocrystalline diamond

0424559 - FZÚ 2014 RIV US eng J - Journal Article
Kozák, M. - Trojánek, F. - Galář, P. - Varga, Marián - Kromka, Alexander - Malý, P.
Coherent phonon dynamics in micro- and nanocrystalline diamond.
Optics Express. Roč. 21, č. 25 (2013), s. 31521-31529. ISSN 1094-4087
R&D Projects: GA ČR(CZ) GAP108/11/0794; GA ČR GA13-12386S
Institutional support: RVO:68378271
Keywords : optical nonlinearities of condensed matter * spectroscopy * coherent anti-Stokes Raman scattering * ultrafast spectroscopy * nanomaterials
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 3.525, year: 2013
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-25-31521

We report on the time-resolved coherent anti-Stokes Raman spectroscopy of phonon dephasing in micro- and nanocrystalline diamond films. The dephasing times T2 were found to be dependent on the morphology of diamond films (average size of crystals and content of nondiamond carbon phase) and changed from 0.7 to 1.72 ps. The dephasing times were found to be temperature independent in the range 10-295 K. In addition to diamond Raman active phonon mode at 1332 cm−1, we investigated also the dynamics of a broad Raman peak at 1530 cm−1 which is present in samples with higher content of nondiamond sp2 hybridized carbon phase. This peak was found to be homogenously broadened with very fast dephasing (T2~50 fs).
Permanent Link: http://hdl.handle.net/11104/0230624