Femtosecond carrier dynamics and saturable absorption in graphene suspensions

被引：192

作者：

Kumar, Sunil ^{[1
,2
]}

Anija, M. ^{[1
,2
]}

Kamaraju, N. ^{[1
,2
]}

Vasu, K. S. ^{[1
]}

Subrahmanyam, K. S. ^{[3
,4
]}

Sood, A. K. ^{[1
,2
,3
,4
]}

Rao, C. N. R. ^{[1
,3
,4
]}

机构：

[1] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India

[2] Indian Inst Sci, Ctr Ultrafast Laser Applicat, Bangalore 560012, Karnataka, India

[3] Jawaharlal Nehru Ctr Adv Sci Res, Chem & Phys Mat Unit, Bangalore 560064, Karnataka, India

[4] Jawaharlal Nehru Ctr Adv Sci Res, Int Ctr Mat Sci, Bangalore 560064, Karnataka, India

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 19期

关键词：

GRAPHITE; FILMS;

D O I：

10.1063/1.3264964

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. [doi:10.1063/1.3264964]

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页数：3

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