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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 22 — Oct. 29, 2007
  • pp: 14619–14628

Dual-probe near-field fiber head with gap servo control for data storage applications

Jen-Yu Fang, Chung-Hao Tien, and Han-Ping D. Shieh  »View Author Affiliations

Optics Express, Vol. 15, Issue 22, pp. 14619-14628 (2007)

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We present a novel fiber-based near-field optical head consisting of a straw-shaped writing probe and a flat gap sensing probe. The straw-shaped probe with a C-aperture on the end face exhibits enhanced transmission by a factor of 3 orders of magnitude over a conventional fiber probe due to a hybrid effect that excites both propagation modes and surface plasmon waves. In the gap sensing probe, the spacing between the probe and the disk surface functions as an external cavity. The high sensitivity of the output power to the change in the gap width is used as a feedback control signal. We characterize and design the straw-shaped writing probe and the flat gap sensing probe. The dual-probe system is installed on a conventional biaxial actuator to demonstrate the capability of flying over a disk surface with nanometer position precision.

© 2007 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(210.0210) Optical data storage : Optical data storage
(220.4830) Optical design and fabrication : Systems design
(280.3420) Remote sensing and sensors : Laser sensors

ToC Category:
Optical Design and Fabrication

Original Manuscript: June 25, 2007
Revised Manuscript: August 31, 2007
Manuscript Accepted: September 6, 2007
Published: October 22, 2007

Jen-Yu Fang, Chung-Hao Tien, and Han-Ping D. Shieh, "Dual-probe near-field fiber head with gap servo control for data storage applications," Opt. Express 15, 14619-14628 (2007)

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