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Infrared near-field study of a localised absorption in a thin film

Published online by Cambridge University Press:  15 November 2001

N. Gross ,
A. Dazzi ,
J. M. Ortega ,
R. Andouart ,
R. Prazeres ,
C. Chicanne ,
J.-P. Goudonnet ,
Y. Lacroute ,
C. Boussard  and
G. Fonteneau
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N. Gross
Affiliation:
LURE, Bât. 209d, Université de Paris-Sud, 91405 Orsay Cedex, France
A. Dazzi
Affiliation:
LURE, Bât. 209d, Université de Paris-Sud, 91405 Orsay Cedex, France
J. M. Ortega*
Affiliation:
LURE, Bât. 209d, Université de Paris-Sud, 91405 Orsay Cedex, France
R. Andouart
Affiliation:
LURE, Bât. 209d, Université de Paris-Sud, 91405 Orsay Cedex, France
R. Prazeres
Affiliation:
LURE, Bât. 209d, Université de Paris-Sud, 91405 Orsay Cedex, France
C. Chicanne
Affiliation:
Optique Submicronique, Univ. de Bourgogne, 9 avenue A. Savary, BP 400, 21011 Dijon, France
J.-P. Goudonnet
Affiliation:
Optique Submicronique, Univ. de Bourgogne, 9 avenue A. Savary, BP 400, 21011 Dijon, France
Y. Lacroute
Affiliation:
Optique Submicronique, Univ. de Bourgogne, 9 avenue A. Savary, BP 400, 21011 Dijon, France
C. Boussard
Affiliation:
Laboratoire des Verres et Céramiques, Campus de Beaulieu, 35042 Rennes Cedex, France
G. Fonteneau
Affiliation:
Laboratoire des Verres et Céramiques, Campus de Beaulieu, 35042 Rennes Cedex, France
S. Hocdé
Affiliation:
Laboratoire des Verres et Céramiques, Campus de Beaulieu, 35042 Rennes Cedex, France
*
ortega@lure.u-psud.fr
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Abstract

We study the conditions to perform micro-spectroscopy with a sub-wavelength lateral resolution in the wavelength spectral range from 3 to 20 μm, taking advantage of the infrared spectral signature of different chemical species. We utilised CLIO, a free electron laser, as the photon source. The transmitted photons were collected by either fluoride or chalcogenide glass fibres. Fibre tips were obtained through chemical etching by organic solvents. Metallisation of the tips permits to achieve lateral resolution of the order of the tip size. However, parasitic propagation of the light in the film reduces the contrast between irradiated and non-irradiated zones. We exemplify our set up with near-field infrared spectra obtained for polymer thin films deposited onto silicon wafers.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 16 , Issue 2 , November 2001 , pp. 91 - 98
Copyright
© EDP Sciences, 2001

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References

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