Patent ID: 8982682
Filing Date: 2015-03-17
Classification: G11B

Abstract:
1. A memory medium for recorded information comprising: a single body of material with a plurality of minute areas of recorded information therein and having a first plane, the plurality of minute areas of recorded information being arranged to form at least one layer that is substantially parallel to the first plane, wherein the single body of material is configured to be arranged with respect to an electromagnetic wave source such that n=sin(θb)/sin(θi) where n is a refractive index of the memory medium, θi is an angle between a direction of propagation of an incident electromagnetic wave in an interior of the single body of material between minutes areas and a normal of the first plane the single body of material is irradiated by the incident electromagnetic wave, θb is an angle between the direction of propagation of the incident electromagnetic wave and the normal of the first plane at which reflectance of a P-polarization component of the incident electromagnetic wave from the first plane is zero, wherein the plurality of minute areas are arranged such that Sx/Dy>tan(θim), where Dy is a size of each minute area in a direction perpendicular to the first plane, Sx is the spacing between adjacent minute areas in a direction parallel to the first plane, and θim is a maximum angle between a direction of propogation of the incident electromagnetic wave in the interior of the single body of material and the normal of the first plane.