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Scattering Rings in Birefringent Porous Silicon

Published online by Cambridge University Press:  01 February 2011

Claudio J. Oton
Affiliation:
INFM and Department of Physics, University of Trento, Via Sommarive 14, 38050 Povo (TN), Italy
Zeno Gaburro
Affiliation:
INFM and Department of Physics, University of Trento, Via Sommarive 14, 38050 Povo (TN), Italy
Mher Ghulinyan
Affiliation:
INFM and Department of Physics, University of Trento, Via Sommarive 14, 38050 Povo (TN), Italy
Nicola Daldosso
Affiliation:
INFM and Department of Physics, University of Trento, Via Sommarive 14, 38050 Povo (TN), Italy
Lucio Pancheri
Affiliation:
Department of Information and Telecommunication Technology, University of Trento, Via Sommarive 14, 38050 Povo (TN), Italy
Paolo Bettotti
Affiliation:
INFM and Department of Physics, University of Trento, Via Sommarive 14, 38050 Povo (TN), Italy
Luca Dal Negro
Affiliation:
INFM and Department of Physics, University of Trento, Via Sommarive 14, 38050 Povo (TN), Italy
Lorenzo Pavesi
Affiliation:
INFM and Department of Physics, University of Trento, Via Sommarive 14, 38050 Povo (TN), Italy
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Abstract

We report the observation of strongly anisotropic scattering of laser light at oblique incidence on (100)-oriented porous silicon layers. We performed angle-resolved light scattering measurements and three concentric rings were observed. Modeling porous silicon by means of nanometric columnar air pores and an effective anisotropic uniaxial dielectric constant explains the observed phenomenon, and besides, the observation of the angle aperture of these rings allows a direct measurement of relative birefringence. We finally study the changes of optical anisotropy after different modifications of the structure.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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