Information recording medium, recording/reproducing method for the same, and information recording/reproducing apparatus

摘要

An information recording medium includes a recording layer, in which information is recorded by two-photon absorption that occurs when recording light is focused on the recording layer. The recording layer ( 211, 212 ) contains a photosensitive polymer that includes a principal chain containing acrylate or methacrylate and a first side chain and a second side chain branched from the principal chain. The first side chain undergoes a cis-trans isomerization reaction upon absorption of the recording light, and the second side chain has a property of being oriented in about the same direction as a direction of the first side chain when the first side chain undergoes the cis-trans isomerization reaction.