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.
A fiber optical probe which is a non-contact, type and highly accurate, and small sized is designed in this paper to detect some holes which are only several millimeters and must be under monitor. Based on Gauss transferring theory, the mode matching principle and matrix optical theory, the effect of the structure of the optical fiber and lens connection is studied. Then the confocal speciality between optical fiber and GRIN lens is also studied based on a fiber optical confocal scanning microscopy (FOCSM). The coupling structure which can get maximal coupling efficiency is designed. Results of preliminary experiments are presented finally.