A Feasibility Study of 25 GB/Layer Dynamic Recording Using Two-Photon Material and Heat-Mode Bump Formation Method

Abstract

We developed a novel heat-mode bump formation method using a two-photon material, and its feasibility for high-capacity recording was experimentally demonstrated. This unique recording method exhibits a very high recording resolution and uses a material with excellent optical transparency. These characteristics are very appropriate for realizing high-capacity multilayer optical discs. We also examined the high-density recording feasibility of a Blu-ray-equivalent format and we obtained a jitter value of 22%. We also fabricated quad-layer media and their recording performance was examined. All the layers exhibited almost identical performance characteristics (2T random pattern; jitter, 14.5 to 16.5%) under the same recording and reading conditions.

A high transmittance optical recording material with long-term reliability for super-multilayer discs

“…[1][2][3][4][5] As a means of increasing the data storage capacity, several technologies have been reported, such as holographic technology, 6,7) near-field technology, 8,9) multilayer technology, [10][11][12][13][14][15][16] and others. [17][18][19][20][21][22][23][24] Among these, multilayer recording technology is a promising approach because it can utilize most technologies of the Blu-ray Disc™ system that is already in use as a commercial technology. 25) Because many recording layers are stacked in a supermultilayer disc, the intensities of the reading and recording lasers are attenuated at the deeper layers.…”

Aberration multiplexing in microholographic recording

“…Three-dimensional recording, in which data are recorded and read out in the vertical direction as well as in the in-plane direction of a recording medium, is promising for realizing large-capacity professional optical storage systems. Among several types of three-dimensional recording technology, microholographic recording [1][2][3][4][5][6] is quite attractive because of its high affinity with conventional optical disk systems compared with twophoton absorption recording [7][8][9][10] and holographic recording. [11][12][13][14][15] Thus far, the author's group has demonstrated microholographic recording with electrical beam control, 16) single-sided optics for microholographic recording, 17) microholographic recording with wavelength and angle multiplexing, 18) rewritable microholographic recording using polarization-sensitive materials, 19) and angular momentum multiplexing in microholographic recording.…”