Kumar, Sunil ; Anija, M. ; Kamaraju, N. ; Vasu, K. S. ; Subrahmanyam, K. S. ; Sood, A. K. ; Rao, C. N. R. (2009) Femtosecond carrier dynamics and saturable absorption in graphene suspensions Applied Physics Letters, 95 (19). 191911_1-191911_3. ISSN 0003-6951
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Official URL: http://apl.aip.org/resource/1/applab/v95/i19/p1919...
Related URL: http://dx.doi.org/10.1063/1.3264964
Abstract
Nonlinear optical properties and carrier relaxation dynamics in graphene, suspended in three different solvents, are investigated using femtosecond (80 fs pulses) Z-scan and degenerate pump-probe spectroscopy at 790 nm. The results demonstrate saturable absorption property of graphene with a nonlinear absorption coefficient, β of (~2-9)×10−8 cm/W. Two distinct time scales associated with the relaxation of photoexcited carriers, a fast one in the range of 130-330 fs (related to carrier-carrier scattering) followed by a slower one in 3.5-4.9 ps range (associated with carrier-phonon scattering) are observed.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Institute of Physics. |
| Keywords: | Graphene; High-speed Optical Techniques; Optical Pumping; Optical Saturable Absorption; Phonons; Photoexcitation; Suspensions |
| ID Code: | 43441 |
| Deposited On: | 11 Jun 2011 12:58 |
| Last Modified: | 03 Oct 2011 14:30 |
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