Antireflection subwavelength structures analyzed by using the finite difference time domain method

Chia Jen Ting, Chi Feng Chen, C. P. Chou

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Antireflection subwavelength structures (ASSs) are analyzed by using the finite difference time domain (FDTD) method in the visible light spectrum. Low reflectance can be obtained by both the conical and pyramidal shapes over a broadband range. Comparing the reflectance of different structure shapes and aspect ratios by the FDTD method, it shows that the antireflection efficiencies of the pyramidal structures are better than that of the conical structures when the aspect ratio is up to 0.8. It is found that, for the conical structure surface, the average transmittance increases gradually with the aspect ratio and the average transmittance is about 99.6% with the aspect ratio of 2.0. However, for the pyramidal structure with the aspect ratio ranging from 1.0 to 2.0, the average transmittance is up to 99.7%.

Original languageEnglish
Pages (from-to)814-817
Number of pages4
JournalOptik
Volume120
Issue number16
DOIs
StatePublished - Nov 2009

Keywords

  • Antireflection
  • Fresnel reflection finite difference time domain
  • Nanostructure
  • Subwavelength structure

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