Effects of the space-bandwidth product on the liquid-crystal kinoform

The effects of the space-bandwidth product on the phase modulation magnitude are our main topic of investigation here. The large phase modulation produced with the liquid-crystal display (LCD) is realized with the kinoform method. One model is established in order to analyze the effects of the space-bandwidth product. The maximum phase change is drastically increased while the pixel size is less than 50 mu m or so. But the effect of the area is almost linear with the maximum phase change. Then the experiments are completed for the purpose of verifying the theoretical analysis. We achieve a phase change of 2.05 lambda (lambda = 633 nm), which is half of the calculated value in a 1 cm x 1 cm area, as it is affected by the cross talk and the pixel shape. (C) 2005 Optical Society of America.