The Physics of ultrafast saturable absorption in graphene.
The ultrafast saturable absorption in graphene is experimentally and theoretically investigated in the femtosecond (fs) time regime. This phenomenon is well-modeled with valence band depletion, conduction band filling and ultrafast intraband carrier thermalization. The latter is dominated by intraband carrier-carrier scattering with a scattering time of 8 ( +/- 3) fs, which is far beyond the time resolution of other ultrafast techniques with hundred fs laser pulses. Our results strongly suggest that graphene is an excellent atomic layer saturable absorber.
Xing
Guichuan
G
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University,21 Nanyang Link, 637371, Singapore.
Guo
Hongchen
H
Zhang
Xinhai
X
Sum
Tze Chien
TC
Huan
Cheng Hon Alfred
CH