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Proceedings Paper

Recording and retrieving of multiplexed near-field holograms
Author(s): Byoungho Lee; Kyoung-Youm Kim; Jingu Kang; Jinhong Park
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Paper Abstract

We present experimental results on the recording and retrieving multiplexed near-field holograms using near-field scanning optical microscopy (NSOM) and a conventional rectangular-parallelpiped or cubic photorefractive crystal. We use the fiber tip of NSOM both as an object and as a probe for scanning (reading) the images. The recording distance between the tapered tip of NSOM and the crystal (i.e. between the object and the recording medium) is a crucial factor determining the size of the stored spot and the angular selectivity since it is dependent on that distance whether the near-field components of the object wave can reach the crystal or not. Experiments on angular multiplexing show that the angular selectivity was about 0.01 degree and the retrieved spot size was smaller than the Rayleigh limit when the recording distance is about 10 nm. In addition, experiments show that near-fields originated from sub-diffraction-limit -size objects could be stored in a photorefractive crystal at 2 mm apart from the crystal surface resulting in the retrieval of sub-diffraction-limit- size spots which means that our scheme can provide a way of multilayer (stack-wise) near-field storage and, thus, contribute to the significant enhancement of the storage capacity of the near-field optical memory.

Paper Details

Date Published: 23 January 2002
PDF: 10 pages
Proc. SPIE 4459, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VII, and Optical Data Storage, (23 January 2002); doi: 10.1117/12.454014
Show Author Affiliations
Byoungho Lee, Seoul National Univ. (South Korea)
Kyoung-Youm Kim, Seoul National Univ. (South Korea)
Jingu Kang, Seoul National Univ. (South Korea)
Jinhong Park, Seoul National Univ. (South Korea)

Published in SPIE Proceedings Vol. 4459:
Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VII, and Optical Data Storage
Shizhuo Yin; Hans J. Coufal; Francis T. S. Yu; Hans J. Coufal, Editor(s)

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