First Playback of High-Definition Video Contents from Super-Resolution Near-Field Structure Optical Disc

Nakai, Kenta; Ohmaki, Masayuki; Takeshita, Nobuo; Shinoda, Masahisa; Hwang, Inoh; Lee, Yongwoon; Zhao, Hui; Kim, Jooho; Hyot, Bérangère; Bernard, André; Poupinet, Ludovic; Shima, Takayuki; Nakano, Takashi; Tominaga, Junji

doi:10.1143/jjap.49.08ke02

Cited by 19 publications

(12 citation statements)

References 8 publications

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“…In addition to excellent CNR values, a very low bit error rate in the range of 10 −5 (much better than the 3 × 10 −4 criterion holding for Blu-Rays) was measured [9]. With this material, high-definition video playback from a Super-RENS 46 GB optical disc was demonstrated for the first time [10]. Despite the good results, the detailed underlying physical mechanism of the Super-RENS effect, created by heating a sub-wavelength area with the incident focused laser, still has to be fully explained.…”

Section: Introductionmentioning

confidence: 83%

Direct measurement of the near-field super resolved focused spot in InSb

Assafrao¹,

Wachters²,

Verheijen³

et al. 2012

Opt. Express

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Under appropriate laser exposure, a thin film of InSb exhibits a sub-wavelength thermally modified area that can be used to focus light beyond the diffraction limit. This technique, called Super-Resolution Near-Field Structure, is a potential candidate for ultrahigh density optical data storage and many other high-resolution applications. We combined near field microscopy, confocal microscopy and time resolved pump-probe technique to directly measure the induced sub-diffraction limited spot in the near-field regime. The measured spot size was found to be dependent on the laser power and a decrease of 25% (100nm) was observed. Experimental evidences that support a threshold-like simulation model to describe the effect are also provided. The experimental data are in excellent agreement with rigorous simulations obtained with a three dimensional Finite Element Method code.

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Section: Introductionmentioning

confidence: 83%

Direct measurement of the near-field super resolved focused spot in InSb

Assafrao¹,

Wachters²,

Verheijen³

et al. 2012

Opt. Express

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“…Utilizing the central scattering effect resulting from nonlinear reverse-saturation absorption, Nakai et al prepared super-resolution read-only disk with a layer stack of "ZnS-SiO 2 (35 nm)/ZrO 2 (15 nm)/InSb(20 nm)/ZrO 2 (15 nm)/ZnSSiO 2 (35 nm)" [24]. The layer stack was deposited onto the read-only disk substrate by magnetron-controlling sputtering method.…”

Section: Read-only Optical Disk With Reverse-saturation Absorption Efmentioning

confidence: 99%

Applications of Nonlinear Super-Resolution Thin Films in Nano-optical Data Storage

Wei

2014

Springer Series in Optical Sciences

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Optical storage is very useful for high-definition digital television, data distribution, and memory. With the development of information technology, the capacity of optical storage devices is required to become larger and larger. Correspondingly, the density is also required to become higher and higher. In order to improve the density, one has to reduce the information bit size. The size is determined by the optical diffraction limit. That is, D ∼ 1.22 /NA, where D is the size of the focused spot, laser wavelength in vacuum, and NA the numerical aperture of optical pickup. In order to improve the capacity and density of optical storage devices, one has to shorten the laser wavelength and increase the numerical aperture of optical pickup. However, a larger NA will reduce the focal depth of pickup and increase comatic aberration when the disk tilts against the optical axis. So far, for farfield optical storage, the NA of pickup has been very close to the theoretical limit (NA = 1). To reduce the mark size, a short wavelength laser source must be used. The laser wavelength has been decreased from 780 nm for compact discs to 405 nm for blue ray disks. Further shortening the laser wavelength is difficult due to the high product cost and low transmission of general optical elements at wavelength below 360 nm.In this regard, the near-field optical probe is a very good method to generate small spot due to avoidance of the diffraction limit, and it can also record nanometric information marks. However, the low optical transmission and some problems in controlling the near-field distance between the probe tip and the sample surface meet difficulties in application to the high-speed rotation optical disk system. The solid immersion lens near-field method can obtain a subwavelength spot and produce nanometric information marks. It can also maintain a higher optical

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“…25) We have demonstrated the real-time playback of high-definition video content from a 50-GB-data-capacity Super-RENS read only memory (ROM) disc with an In-Sb active film. 26,27) For further increase in total recording density, an increase in the recording density in the radial direction (radial density) is important. Figure 1 shows a curve of the general modulation transfer function (MTF) in the radial direction of the BD system.…”

Section: Introductionmentioning

confidence: 99%

Super-Resolution Optical Disc with Radial Density Increased by Narrowed Track Pitch Corresponding to Diffraction Limit

Nakai

Ohmaki

Takeshita

et al. 2013

Jpn. J. Appl. Phys.

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In–Sb-based super-resolution near-field structure read-only-memory discs with radial density increased by introducing a narrow track pitch corresponding to the diffraction limit of an optical system were developed. Using an optical system with a laser diode with a wavelength of 405 nm and an objective lens with a numerical aperture of 0.85, we confirmed that differential phase detection (DPD) could detect track errors from disc samples recorded random data including a minimum pit length of 75 nm in a 240 nm track period. It has higher capability of track error detection than push–pull detection at a narrowed track pitch. Moreover, bit error rates satisfying the criterion of 3.0×10-4 were experimentally obtained for 66.7-GB-capacity disc samples with a 240 nm track pitch through signal processing with the partial response maximum likelihood of the (1,2,2,1)-type, by applying DPD to tracking servo control. The feasibility of increasing the track density of the Blu-ray DiscTM physical format by 1.33 times was indicated.

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First Playback of High-Definition Video Contents from Super-Resolution Near-Field Structure Optical Disc

Cited by 19 publications

References 8 publications

Direct measurement of the near-field super resolved focused spot in InSb

Direct measurement of the near-field super resolved focused spot in InSb

Applications of Nonlinear Super-Resolution Thin Films in Nano-optical Data Storage

Super-Resolution Optical Disc with Radial Density Increased by Narrowed Track Pitch Corresponding to Diffraction Limit

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