Parallel Signal Readout for Roll-Type Optical Advanced Memory

Abstract

We demonstrated one-dimensional parallel readout of a roll-type optical advanced memory. Using a line shape focused beam, multiple signals can be detected simultaneously. To demonstrate one-dimensional parallel readout, we fabricated groove-structured roll-type optical advanced memory. The groove-structures were imprinted by a digital versatile disc stamper. We could detect multiple signals from each groove-structured layer without crosstalk by using line-scanning confocal microscopy. We demonstrated the simultaneous detection of eleven signals.

New Wobble-Address Format for an Optical Disc with a Separated Guide Layer

“…[2][3][4][5] Several technologies of realizing large-capacity optical storage have been reported, such as a volume holographic memory, [6][7][8][9] a solidimmersion objective lens system, [10][11][12] a multilayer disc system, [13][14][15] and others. [16][17][18][19][20][21][22] Multilayer technology for optical discs with a separated guide layer has been reported 23) as one of the most promising approaches for storing large-capacity data in a single disc. In this method, servo information is separately prepared in the guide layer away from the stacked recording layers.…”