READER, PLAYBACK DEVICE AND RECORDING AND PLAYBACK DEVICE

摘要

A reader (12) is provided with: a near-field optical device (122), which has (i) one or a plurality of quantum dots and (ii) an output end (224) that is laminated on the upper layer of the one or plurality of quantum dots; and a light-receiving means (124) which, when recorded information on a recording medium is played back, receives light attributable to near-field light formed by the near-field optical device. The reader enables information recorded by heat-assisted magnetic recording to be played back without providing a separate magnetic circuit.