Phase controlled evanescent field systems and methods for optica

Details Phase controlled evanescent field systems and methods for optica Phase controlled evanescent field systems and methods for optica

1996-10-08

1998-05-19

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369126, 250216, G11B 900, H01J 314

Patent

active

057545146

ABSTRACT:
An optical recording and retrieval system and method that employs phase-controlled evanescent field illumination to optically encode and decode information at full-field and in real-time or substantially real-time. The system is particularly useful for high density information storage in media in which submicron optically active sites are formed. The light waves comprising the evanescent electromagnetic field are inhomogeneous in that their planes of equal phase are substantially perpendicular to the direction of propagation and to their planes of constant amplitude. The planes of equal phase are therefore normal to the surface to which the evanescent field is adjacent and to an optical recording media surface illuminated by this field as well. By controlling the phase of the source of illumination and analyzing the output from or beneath the surface, either by phase analysis or phase to amplitude decoding, subwavelength lateral surface feature resolution is enhanced without sacrificing vertical resolution. Methods and means for dynamic or static phase shifting of inhomogeneous waves comprising the evanescent field are disclosed.

REFERENCES:
patent: 4947034 (1990-08-01), Wickramasinghe et al.
patent: 5125750 (1992-06-01), Corle et al.
patent: 5484558 (1996-01-01), Guerra

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