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Proceedings Paper

Single-beam recording and retrieving of sub-wavelength-size optical information in a photorefractive crystal using near-field scanning optical microscopy
Author(s): Kyoung-Youm Kim; Jingu Kang; Byoungho Lee
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Paper Abstract

We suggest a way of photorefractive recording of sub- wavelength size optical information using the refractive index change induced by the single beam from the tapered fiber tip of the near-field scanning optical microscopy (NSOM). Data are recorded by the pure (without any change in the topography of the surface) refractive index change induced near the surface of photorefractive crystal by the light intensity distribution from the subwavelength-size fiber tip in NSOM. The size of index variation can be smaller than the size of wavelength since the distance between the tapered tip of NSOM and the crystal is about 10 nm. This can modify the transmission and collection characteristics of the light from the NSOM through the photorefractive crystal. Therefore, the characteristics of the reading beam depend on whether we previously exposed (recorded) the light from the tapered fiber tip or not and thus, the change in transmission or collection characteristics can be regarded as the on/off (binary) data.

Paper Details

Date Published: 23 January 2002
PDF: 8 pages
Proc. SPIE 4459, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VII, and Optical Data Storage, (23 January 2002); doi: 10.1117/12.454025
Show Author Affiliations
Kyoung-Youm Kim, Seoul National Univ. (South Korea)
Jingu Kang, Seoul National Univ. (South Korea)
Byoungho Lee, 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; Francis T. S. Yu; Hans J. Coufal; Hans J. Coufal, Editor(s)

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