High-Density Near-Field Recording on Cover-Layer Protected Discs Using an Actuated 1.45 Numerical Aperture Solid Immersion Lens in a Robust and Practical System

Verschuren, Coen A.; Bruls, Dominique; Yin, Bin; Eerenbeemd, Jack M. A. van den; Zijp, Ferry

doi:10.1143/jjap.46.3889

Cited by 25 publications

(12 citation statements)

References 11 publications

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“…In ongoing work, we are conducting finer-resolution FDTD simulations to examine the sensitivity of our proposed nanojet-enabled optical data-storage technique to fluctuations of the head-to-media spacing (reported to be < 3 nm, even at 3000 rpm [4]). In this regard, we are also studying the use of a silica microsphere that generates a longer nanojet which would allow increasing the head-to-media spacing.…”

Section: Summary Discussion and Ongoing Workmentioning

confidence: 99%

“…Obtaining the finest possible optical resolution [1,2], with specific potential applications to high-density optical data storage [3,4] and microscopy [5], has been a long-time area of active research. In this paper, we propose new techniques for high-density optical data storage based upon the photonic nanojet [6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Photonic nanojet-enabled optical data storage

Kong¹,

Sahakian²,

Taflove³

et al. 2008

Opt. Express

136

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We show that our recently reported microwave photonic jet technique for detection of deeply subwavelength pits in a metal substrate can be extended to optical wavelengths for purposes of high-density data storage. Three-dimensional finite-difference time-domain computational solutions of Maxwell's equations are used to optimize the photonic nanojet and pit configuration to account for the Drude dispersion of an aluminum substrate in the spectral range near lambda= 400 nm. Our results show that nanojet-illuminated pits having lateral dimensions of only 50 nm x 80 nm yield a contrast ratio 27 dB greater than previously reported using a lens system for pits of similar area. Such pits are much smaller than BluRay features. The high detection contrast afforded by the photonic nanojet could potentially yield significant increases in data density and throughput relative to current commercial optical data-storage systems while retaining the basic geometry of the storage medium.

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Section: Summary Discussion and Ongoing Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photonic nanojet-enabled optical data storage

Kong¹,

Sahakian²,

Taflove³

et al. 2008

Opt. Express

136

View full text Add to dashboard Cite

show abstract

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] It can exhibit a large capacity and a highdata transfer rate towards recording next-generation ultrahigh-definition television [i.e., Super Hi-Vision (SHV), 7320 Â 4320 pixels] video signals 17,18) for home-use. Fourfold higher density recording using NFR optical disks with 1.2-mm-thick disks has been reported, 12,14) and studies of larger capacity using multilayer recording using NFR have been reported.…”

Section: Introductionmentioning

confidence: 99%

Recording characteristics of high-density thin optical disk using near-field optical recording

Koide

Kajiyama

Sato

et al. 2014

OPT REV

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We report on the recording characteristics of a near-field optical recording thin optical disk (NFR-TOD). We proposed a new cooling-less-type write strategy for recording, applied it to the NFR-TOD experimental system, and also applied a partial response maximum likelihood (PRML) signal processing, which was evaluated and optimized the PR coefficient for playback signals of the prototype NFR-TOD. The NFR-TOD has a track pitch of 160 nm and improved recording characteristics. The experimental results of the prototype NFR-TOD and the system indicate sufficiently low bit error rates (bERs) for recorded data at a fourfold higher recording density than the current Blu-ray disk.

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“…A recording capacity of 75 Gbytes has been achieved using the disk with the topcoat. 3) On the other hand, the topcoat should also have a refractive index higher than the NA of the SIL to achieve a sufficient evanescent couple between the SIL and the topcoat. In the study by Verschuren et al, a pure UVcurable resin was used as a topcoat.…”

Section: Introductionmentioning

confidence: 99%

High-Density Recording with a Near-Field Optical Disk System Using a Medium with a Top Layer of High Refractive Index

Ishimoto¹,

Nakaoki²,

Saito³

et al. 2009

jjap

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A near-field optical technology using a solid immersion lens (SIL) has been actively studied to expand the storage capacity higher than 100 Gbytes per layer in a 12-cm-sized optical disk. However, the working distance of an objective lens in a near-field optical disk system should only be 25 nm or less. Therefore, from the practical viewpoint, a topcoat layer is required to protect the recording layer when the SIL collides with a disk surface because of disturbances such as dust, shock and vibration. From a mechanical viewpoint, the topcoat should have the mechanical toughness to protect the disk surface. Moreover, from an optical viewpoint, it should have refractive index higher than the numerical aperture of an SIL to achieve a sufficient evanescent couple between the SIL and disk surface. In this study, we describe a topcoat for a near-field optical recording. First, we investigate the topcoat performance from the optical viewpoint. Second, we evaluate the topcoat performance from a mechanical viewpoint. Finally, we report the results of recording experiments for a disk with the topcoat and discuss its performance.

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High-Density Near-Field Recording on Cover-Layer Protected Discs Using an Actuated 1.45 Numerical Aperture Solid Immersion Lens in a Robust and Practical System

Cited by 25 publications

References 11 publications

Photonic nanojet-enabled optical data storage

Photonic nanojet-enabled optical data storage

Recording characteristics of high-density thin optical disk using near-field optical recording

High-Density Recording with a Near-Field Optical Disk System Using a Medium with a Top Layer of High Refractive Index

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