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

Applied Sciences

Cheol-Ki Min¹  Hyungbae Moon²  Do-Hyung Kim²  No-Cheol Park¹  Kyoung-Su Park² 

[1] School of Mechanical Engineering, Yonsei University, 262 Seoungsanno, Seodaemun-gu, Seoul 120-749, Korea; E-Mails:;Center for Information Storage Device, Yonsei University, 262 Seoungsanno, Seodaemun-gu, Seoul 120-749, Korea; E-Mails:

关键词: microholographic storage system;    diffraction focus;    scalar diffraction theory;    vector diffraction theory;    polarization;    refractive index modulation;    interferogram;    diffraction efficiency;   

DOI  :  10.3390/app4010057

来源: mdpi

【 摘 要 】

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 λ/(2NA). 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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.