Numerical study on spectral properties of tungsten one-dimensional surface-relief gratings for spectrally selective devices

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Abstract

Spectral properties of one-dimensional tungsten gratings with various depths and widths of grooves were investigated by means of finite-difference time-domain simulation with a multi-Lorentz model. Shallow gratings showed a strong absorption peak due to surface plasmon polaritons when the oscillation of the electric field was parallel to the grating vector. On the other hand, deep gratings with wide grooves showed a different absorption attributed to the microcavity effect when the oscillation of the electric field was perpendicular to the grating vector. With narrowed grooves, another absorption with d-dependence occurred, which was probably due to vertically oscillating surface plasmons to the grooves.

Original languageEnglish
Pages (from-to)1805-1813
Number of pages9
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume22
Issue number9
DOIs
Publication statusPublished - 2005 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition

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