Development of the visual encryption device using higher-order birefringence

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We will propose a new type of visual encryption device composed of higher-order birefringence elements. When a higher-order birefringence sample which is sandwiched between a pair of polarizer is illuminated with white light from one side, the sample with white color is observed. On the other hand, when the sample is illuminated by monochromatic light, its brightness of transparent light depends on a wavelength. The encryption device is fabricated by controlling the amount of higher order birefringence which gives a high contrast at only certain wavelength under polarized illumination. The device can be decoded by the illumination of specific reading wavelength.