Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

High-Speed and Precise Gap Servo System for Near-Field Optical Recording

Not Accessible

Your library or personal account may give you access

Abstract

A data transfer rate higher than 300 Mbps and large-capacity optical recording media are needed for recording Super Hi-Vision signals in next-generation broadcasting. A near-field optical recording (NFR) system using the solid immersion lens (SIL) 1) is expected for next-generation optical recording media. The NFR system has four times higher recording density than the blu-lay disk system and realized large capacity2), 3). However, the data transfer rate cannot not reach that of the blu-lay disk system because the gap length (GL) between the optical head and the disk must be below 100 nm (λ/4, λ: laser wave length), which enables evanescent coupling. It is difficult to keep a short GL and to perform the gap servo for the rotational disk that has large axial run-out disturbance at high speed. Precise gap servo technology must be developed to achieve the high-data-transfer-rate recording. Some papers have reported precise gap servo control on the high density media with a track pitch of 0.16 µm at 3600 rpm4), 5), and reported the feasibility for high-speed gap servo at 5000 rpm by using a flexible disk6). A repetitive control method is applied to these gap servos. We have proposed a high-speed ZPET-FF control method7) that is more precise and faster than the repetitive control. Another paper also reported a compensating method for tracking error components8). This paper proposes a new high-speed and precise gap servo control system based on our proposed FF control method that can suppress the disturbance fitted for the behavior of axial run-out of the rotational disk. The proposed method can perform the precise gap servo on the NFR system using the 100 GB optical disk at 11000 rpm.

© 2011 Optical Society of America

PDF Article
More Like This
THE SMALL-SIZED OPTICAL MODULE AND THE SLED MOVING METHOD OF A GAP SERVO NEAR FIELD RECORDING

Do Hyeon Son, Mi Hyeon Jeong, Gi na Kim, Seong Hun Lee, In Gu Han, Jeong Kyo Seo, In Ho Choi, and Byung Hoon Min
WA4 Optical Data Storage (ODS) 2007

High-Speed Tracking Control System for Broadcast-Use Optical Disk Drive

Daiichi Koide, Haruki Tokumaru, Kiyoshi Ohishi, Kazuyoshi Kuramochi, and Toshimasa Miyazaki
TuC6 International Symposium on Optical Memory and Optical Data Storage (ODS) 2005

Application of Gap Servo Near-Field System to Active Measurement on Nanostructure Topology

Hyun CHOI, Joong-Gon KIM, Wan-Chin KIM, No-Cheol PARK, and Young-Pil PARK
MD3 Optical Data Storage (ODS) 2007

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved