Strain effects of InP/Si and InP/porous Si studied by spectroscopic ellipsometry M. Lajnef, N. Ben Sedrine, J. C. Harmand, L. Travers, H. Ezzaouia and R. Chtourou Eur. Phys. J. Appl. Phys., 42 2 (2008) 99-102 Published online: 28 March 2008 DOI: 10.1051/epjap:2008042