کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1495024 | 992925 | 2012 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Femtosecond carrier dynamics in photoexcited highly ordered pyrolytic graphite films Femtosecond carrier dynamics in photoexcited highly ordered pyrolytic graphite films](/preview/png/1495024.png)
The ultrafast relaxation of photoexcited carriers in thin films of exfoliated highly ordered pyrolytic graphite are examined using the equal-pulse correlation technique. An extremely fast relaxation due to intraband carrier–carrier thermalization was observed at 15 ± 10 fs followed by intraband carrier–optical phonon interaction on the order of 175 ± 30 fs. A modulation in the absorption depth of 1.4% was observed in the samples from partial saturation due to Pauli blocking.
► The equal-pulse correlation technique was utilized to examine relaxation times.
► We measure the ultrafast relaxation of photoexcited carriers in HOPG thin films.
► Modulation in the absorption depth of HOPG films due to Pauli blocking was observed.
► Relaxations are attributed to carrier–carrier and carrier–phonon interactions.
► Graphene and HOPG films are viable saturable absorbers for mode-locked lasers.
Journal: Optical Materials - Volume 34, Issue 8, June 2012, Pages 1299–1302