Computer calculation and simulation in confocal multi-layer optic storage

Pinchun Kang; Jianhuan Zhang

doi:10.1117/12.752051

24 January 2008 Computer calculation and simulation in confocal multi-layer optic storage

Pinchun Kang, Jianhuan Zhang

Proceedings Volume 6827, Quantum Optics, Optical Data Storage, and Advanced Microlithography; 68271D (2008) https://doi.org/10.1117/12.752051
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

In this paper, a multilayer optical data storage method in which confocal microscopy is used for its optical sectioning is proposed. A confocal microscopy has the ability to collect optical sections from thick specimens, the key to the confocal approach is the use of spatial filtering (pinhole) to eliminate out-of-focus light or flare in specimens that are thicker than the plane of focus. For this reason the confocal multi-layer technology is promising as a new multi-layer optic storage method, in which when a layer has been chosen by being focused with the laser beam, the light from other layers in a certain distance-always tens of microns-will not be propagated through the pinhole and detected by a sensitive sensor. This means the information recorded in different layers can be read separately, the interference between layers is greatly suppressed. The properties of multilayer memory based on confocal microscopy are investigated on the basis of vector theory. The algorithms for calculation of field intensity in a focused laser spot and focused beam propagation through multilayer structure have been elaborated. The developed algorithms are applied for investigation of properties for multilayer recording based on confocal microscopy. The numerical simulation of optical properties of a multilayer optical data storage system with three layers has been shown in the paper. We used pits and bumps to record information. The results of the experiment and the conclusion are obtained finally.

Citation Download Citation

Pinchun Kang and Jianhuan Zhang "Computer calculation and simulation in confocal multi-layer optic storage", Proc. SPIE 6827, Quantum Optics, Optical Data Storage, and Advanced Microlithography, 68271D (24 January 2008); https://doi.org/10.1117/12.752051

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KEYWORDS

Confocal microscopy

Optical storage

Computer simulations

Objectives

Diffraction

Algorithm development

Optical discs

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