We report the observation of strongly anisotropic scattering of laser light at oblique incidence on a (100)-oriented porous silicon layer. The scattered light forms cones tangent to the incident and reflected beams. The conical pattern is caused by scattering on the vertical walls of pores, which are straight along the layer thickness. The light cone defines structured light rings onto a screen normal to the cone axis. We explain the various structures by optical anisotropy of porous silicon. For the sample under analysis, we directly measure from the ring patterns a value of \Delta n/n_ord=8% of positive birefringence.



Titolo: Scattering rings in optically anisotropic porous silicon
Autori: 
Ghulinyan, Mher
mostra contributor esterni 
Data di pubblicazione: 2002
Rivista: 
APPLIED PHYSICS LETTERS  
Abstract: We report the observation of strongly anisotropic scattering of laser light at oblique incidence on a (100)-oriented porous silicon layer. The scattered light forms cones tangent to the incident and reflected beams. The conical pattern is caused by scattering on the vertical walls of pores, which are straight along the layer thickness. The light cone defines structured light rings onto a screen normal to the cone axis. We explain the various structures by optical anisotropy of porous silicon. For the sample under analysis, we directly measure from the ring patterns a value of \Delta n/n_ord=8% of positive birefringence.
Handle: http://hdl.handle.net/11582/20549
Appare nelle tipologie:1.1 Articolo in rivista

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