Optical element for forgery proof

Abstract

There is provided a versatile optical element applicable both to an electrode layer required in a bank bill field and to an optical element required in an ID field. In an optical element () according to one embodiment of the present invention, a first layer () is arranged on a second layer () having a relief structure on a surface thereof, and a first region () and a second region () are provided. Electromagnetic waves incident at a preset specific angle from a side of the first layer () are totally reflected due to at least one of the relief structure in the first region () and a ratio of a refractive index of the second layer () with respect to a refractive index of the first layer (), the electromagnetic waves incident at the specific angle from the side of the first layer () are not totally reflected but transmitted or refracted due to at least one of the relief structure in the second region () and the ratio of the refractive index of the second layer () with respect to the refractive index of the first layer (), and only in case of observation performed from the specific angle on the first layer () side, the second region () has higher transparency than the first region (), and a preset image is expressed by a transparency contrast therebetween.