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Title

Measurement of nonlinear refractive index of Ag and Au nano-particles using moiré technique
Authors

M.H. Majles Ara
Z. Javadi
R.S. Sirohi
Journal / Anthology

Optik
Year: 2011
Volume: 122
Issue: 21
Page range: 1061-1964
Description

In this paper we have measured second order nonlinear refractive index of Ag and Au nano-particles using the moiré deflectometry with a CW He–Ne laser at wavelength of 632.8 nm. The main advantages of this technique are its extreme experimental simplicity and low sensitivity to external distribution in comparison with other interfrometric methods that need very stable experimental set-up. Because of self-focusing (or self-defocusing) that is due to intensity dependent refractive index, presence of sample in the moiré deflectometry set-up lead to rotation of moiré fringes. By moving the sample in set-up we have measured these rotation angles in different displacements from focus point of lens used in this setup and then we have calculated the nonlinear refractive index of Ag and Au nano-particles using their values. Also we have obtained the sign of n2 regard to the direction of rotations. Consequently by using the Mathematica software we have exhibited the suitable fitness of theoretical curve with experimental results. © 2011 Elsevier GmbH. All rights reserved.
Subject

*Unclassified