Vector diffraction from subwavelength optical disk structures: Two-dimensional modeling of near-field profiles, far-field intensities, and detector signals from a DVD

Wei Chih Liu, Marek W. Kowarz

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Rigorous two-dimensional vector-diffraction patterns of a focused beam incident on an optical disk, specifically, a digital versatile disk (DVD), are examined both in the near field and in the far field. An efficient finite-difference frequency-domain method is developed for calculating the electromagnetic fields in the neighborhood of subwavelength dielectric and metallic structures. The results of vectordiffraction theory are compared with those of scalar-diffraction theory for pressed DVD features that consist of pits or of bumps. The sum (data) and difference (tracking) signals from a split photodetector are also calculated for different disk features and for different polarizations. The subwavelength features of a DVD result in considerable vector-diffraction effects both in the near-field profiles and in the detector signals, depending not only on the polarization of illumination but also on whether the features are pits or bumps. This paper provides important insight into the vector-diffraction effects encountered in high-density optical data storage systems.

Original languageEnglish
Pages (from-to)3787-3797
Number of pages11
JournalApplied Optics
Volume38
Issue number17
DOIs
Publication statusPublished - 1999 Jun 10

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signal detectors
optical disks
far fields
near fields
profiles
diffraction
optical density
polarization
data storage
photometers
electromagnetic fields
diffraction patterns
illumination
scalars

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

Cite this

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