Polarization rotation and phase compensation in near-field elect

Details Polarization rotation and phase compensation in near-field elect Polarization rotation and phase compensation in near-field elect

1998-01-21

1999-10-05

Cabeca, John W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 13, 369126, G11B 700

Patent

active

059635320

ABSTRACT:
An electro-optical storage system based on a near-field configuration having phase-distortion reducing mechanism. The system comprises a read/write head and a head positioning system, an optics module including beam relay optics and signal detectors, an optical medium and a corresponding medium driving unit, and an electronic control system. The optical head includes a near-field lens positioned over the optical medium by a fraction of the wavelength. The phase-distortion reducing mechanism imposes a phase-compensating profile on the optical wavefront and/or rotates the beam polarization to reduce a phase distortion caused by the lens aberrations and an extra phase profile induced by the near-field configuration.

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