Open AccessDemonstration of nonlinear absorption in Au semi-continuous film by electrical measurement
Author(s) -
M. M. A. Yajadda,
David I. Farrant,
Igor Levchenko,
K.H. Müller,
Kostya Ken Ostrikov
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.017167
Subject(s) - materials science , absorption (acoustics) , optics , laser , wavelength , attenuation coefficient , diffusion , substrate (aquarium) , analytical chemistry (journal) , atomic physics , molecular physics , optoelectronics , physics , chemistry , oceanography , geology , chromatography , composite material , thermodynamics
We have demonstrated the nonlinear absorption at 532 nm wavelength in an Au semi-continuous film (SF) resulting from smearing of the Fermi distribution and diffusion of conduction electrons into the substrate. The Au SF was irradiated by a pulsed laser with 8 ns pulse width at 532 nm in near resonance with the interband transition of the Au. We determined the temperature increase in the SF for different intensities by electrical measurement. We calculated the temperature increase by using a 1D heat transport equation; comparing the results of the calculation with measured values for the temperature increase, revealed the nonlinear absorption in the Au SF. We employed this deviation from linear behaviour to determine the nonlinear absorption coefficient.