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

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

1
School of Mechanical Engineering, Yonsei University, 262 Seoungsanno, Seodaemun-gu, Seoul 120-749, Korea
2
Center for Information Storage Device, Yonsei University, 262 Seoungsanno, Seodaemun-gu, Seoul 120-749, Korea
*
Author to whom correspondence should be addressed.
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)
View Full-Text   |   Download PDF [837 KB, 24 March 2014; original version 13 March 2014]   |  

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. View Full-Text
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 (CC BY 3.0).

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MDPI and ACS Style

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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