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Appl. Sci. 2014, 4(1), 57-65; doi:10.3390/app4010057
Article

Diffraction Focal Position and Vector Diffraction Theory for Micro Holographic Storage Systems

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Received: 18 November 2013 / Revised: 12 February 2014 / Accepted: 18 February 2014 / Published: 13 March 2014
(This article belongs to the Special Issue Optical Memory)
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Abstract

In this study, we proposed a method to determine the optimal focal position for micro-holographic storage systems, using vector diffraction theory; the theory provides exact solutions when the numerical aperture (NA) exceeds 0.6. The best diffraction focus was determined by the position and wavelength corresponding to minimal spherical aberration. The calculated refractive index modulation, polarization illumination, and boundary conditions at the interface of different media were analyzed. From the results of our analysis, we could confirm the size of micrograting as a function of NA and wavelength, based on vector diffraction theory, compared with scalar diffraction theory which defines the micrograting by . To demonstrate our analysis, we adapted an optical alignment method using a Twyman-Green interferometer, and could obtain good agreement between analysis and experimental results.
Keywords: microholographic storage system; diffraction focus; scalar diffraction theory; vector diffraction theory; polarization; refractive index modulation; interferogram; diffraction efficiency microholographic storage system; diffraction focus; scalar diffraction theory; vector diffraction theory; polarization; refractive index modulation; interferogram; diffraction efficiency
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Min, C.-K.; Moon, H.; Kim, D.-H.; Park, N.-C.; Park, K.-S.; Park, Y.-P. Diffraction Focal Position and Vector Diffraction Theory for Micro Holographic Storage Systems. Appl. Sci. 2014, 4, 57-65.

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