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Femtosecond carrier dynamics and saturable absorption in graphene suspensions

Kumar, Sunil and Anija, M and Kamaraju, N and Vasu, KS and Subrahmanyam, KS and Sood, AK and Rao, CNR (2009) Femtosecond carrier dynamics and saturable absorption in graphene suspensions. In: Applied physics letters, 95 (19).

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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, beta of (similar to 2-9) x 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 it slower one in 3.5-4.9 ps range (associated with carrier-phonon scattering) are observed. (C) 2009 American Institute of Physics.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to American Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 05 Jan 2010 11:09
Last Modified: 19 Sep 2010 05:54
URI: http://eprints.iisc.ernet.in/id/eprint/25344

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