Abstract
The optical form birefringence in porous silicon films is measured by analyzing the transmitted interference intensity of a polarization interferometer. A novel form birefringence called boundary condition (BC) model for porous materials is introduced and evaluated experimentally against samples of porous silicon films. The variation of optical indexes of refraction vs the porosity in silicon films agrees with the calculated values of n/sub o//n/sub e/ within 1% error using the BC model, in contrast to the /spl sim/15% error using effective medium approximation model.
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