Spherical Aberration Detection in the Optical Pickups    for High-Density Digital Versatile Discs

Shimano, Takeshi; Umeda, Mariko; Ariyoshi, Tetsuo

doi:10.1143/jjap.40.2292

Cited by 5 publications

(1 citation statement)

References 1 publication

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“…In the other methods, rays near and far from the optical axis that split from the reflected light from the disc are utilized. 2,3) Then a focus error signal (FES) is detected from each ray, and an SA error signal (SAES) is calculated from the obtained FESs. The proposed separation pattern for SA detection in this method has the problem caused by OL shift.…”

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confidence: 99%

Spherical Aberration Error Detection for Blu-ray Disc Optical Pickups

Ogata¹,

Kanazawa²,

Horiyama³

et al. 2006

Jpn. J. Appl. Phys.

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For a high-numerical-aperture (NA) optical pickup system, the spherical aberration (SA) caused by cover layer thickness error should be corrected. We detected the SA error signal using a newly designed hologram optical element (HOE). The HOE has both sufficient signal sensitivity and constant signal level independent of objective lens shift. In addition, we fabricated on SA servo for a dual-layer Blu-ray disc.

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confidence: 99%

Spherical Aberration Error Detection for Blu-ray Disc Optical Pickups

Ogata¹,

Kanazawa²,

Horiyama³

et al. 2006

Jpn. J. Appl. Phys.

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Adaptive aberration compensation in high NA optics

Shimano

Ariyoshi

Sukeda

et al.

International Symposium on Optical Memory and Optical Data Storage Topical Meeting

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Aberration-Compensation Methods for 0.85-Numerical-Aperture (NA) Single-Element Objective Lens

Ariyoshi¹,

Shimano²,

Maruyama³

2002

Jpn. J. Appl. Phys.

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We report on the theoretical investigation of how geometrically uniform highly doped silicon nanowires can break up into a series of islands that exhibit Coulomb blockade. By using a newly developed numerical simulation in which random ionized dopants are introduced explicitly and the electron distribution is calculated self-consistently under the Thomas-Fermi approximation, we demonstrate natural formation of electron islands in the nanowires owing to the random dopant potential. We study the quasi-one-dimensional nature of the electron islands formed in the nanowires. The offset charge effects on the current threshold of the nanowire transistors are then investigated by feeding the derived structural parameters such as inter-island capacitance and tunnel resistance into a Monte Carlo single electron transport simulator. We show that the overall threshold voltage distribution can roughly be described as a two-'macro'-island system despite a complex series of multiple electron islands.

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Spherical Aberration Detection in the Optical Pickups for High-Density Digital Versatile Discs

Cited by 5 publications

References 1 publication

Spherical Aberration Error Detection for Blu-ray Disc Optical Pickups

Spherical Aberration Error Detection for Blu-ray Disc Optical Pickups

Adaptive aberration compensation in high NA optics

Aberration-Compensation Methods for 0.85-Numerical-Aperture (NA) Single-Element Objective Lens

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