Jpn. J. Appl. Phys. 44 (2005) pp. 3645-3648  |Previous Article|  |Table of Contents|
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Optical Read-Only-Memory Card System Based on the Talbot Effect

Thomas de Hoog, Aukje Kastelijn, Rob Hendriks, René Verberne and Christopher Busch

(Received November 15, 2004; accepted February 14, 2005; published May 24, 2005)

We present our progress in developing an optical storage system for portable devices, consisting of a removable read-only-memory (ROM) card and a robust reader. The bit patterns stored on the card medium are read out using an array of probes that are generated by means of the Talbot effect. The data are recovered in a parallel fashion by detection with a standard pixelated image sensor. To attain a large data capacity, a multiplexing scheme has been developed: from a large number of different data pages, individual pages can be selected by scanning the probe array over the medium in x and y direction. In order to position the probes accurately it is required to have accurate position information. A method has been devised to generate servo signals by making use of the moiré interference effect. A compact demonstrator was built that demonstrates feasibility of this position control method.

KEYWORDS: optical memory, optical card, Talbot effect, position control, servo signals, moiré effect
URL: http://jjap.ipap.jp/link?JJAP/44/3645/
DOI: 10.1143/JJAP.44.3645

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