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A computer program based on the finite element method is used to study variations in pit visibility for a pit structure that is similar to those used in TwoDOS systems. It is concluded that pit visibility is best enhanced by making the pit width larger, and that destructive interference by making pit depth d = λ Poly /4 (where λ Poly is the wavelength in Polycarbonate) does not play a major role. Also, pit visibility depends strongly on the thickness of the Al layer. The simulations aredoi:10.1364/oe.15.002075 pmid:19532445 fatcat:emku45e7gnb5jdbrtqpejv2xhu