Ultrafast Switching Time and Third Order Nonlinear Coefficients of Microwave Treated Single Walled Carbon Nanotube Suspensions

被引：8

作者：

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

Kumar, Sunil ^{[1
,2
]}

Karthikeyan, B. ^{[1
,2
]}

Kakade, Bhalchandra ^{[3
]}

Pillai, Vijayamohanan K. ^{[3
]}

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

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] Natl Chem Lab, Phys & Mat Chem Div, Pune 411008, Maharashtra, India

来源：

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY | 2009年 / 9卷 / 09期

关键词：

Ultra-Fast Switching; SWCNT; Nonlinear Optical Coefficients; ABSORPTION;

D O I：

10.1166/jnn.2009.1184

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Microwave treated water soluble and amide functionalized single walled carbon nanotubes have been investigated using femtosecond degenerate pump-probe and nonlinear transmission experiments. The time resolved differential transmission using 75 femtosecond pulse with the central wavelength of 790 nm shows a bi-exponential ultrafast photo-bleaching with time constants of 160 fs (130 fs) and 920 fs (300 fs) for water soluble (amide functionalized) nanotubes. Open and closed aperture z-scans show saturation absorption and positive (negative) nonlinear refraction for water soluble (amide functionalized) nanotubes. Two photon absorption coefficient, beta(0) similar to 250 cm/GW (650 cm/GW) and nonlinear index, gamma similar to 15 cm(2)/pW (-30 cm(2)/pW) are obtained from the theoretical fit in the saturation limit to the data for two types of nanotubes.

引用

页码：5550 / 5554

页数：5

共 23 条

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