Enhancement of bandwidth in a chirped quarter-wave dielectric mirror

C. J. Wu, B. H. Chu, M. T. Weng, H. L. Lee

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18 Citations (Scopus)

Abstract

Based on the quarter-wave dielectric mirror (Bragg reflector), a chirp scheme to enhance the bandwidth is proposed. We model the chirped mirror by successively cascading a number of sub-Bragg reflectors in which the optical lengths of the two constituent dielectric layers in each sub-Bragg reflector are varied in a linear chirp manner. With the change in the chirp parameter, it is seen that the reflection bandwidth is pronouncedly enlarged due to the shift in the bandedges. In addition, a broader bandwidth can be obtained when a different chirp arrangement of structure is designed. Investigation of angle-dependent reflectance for the TE wave is also given.

Original languageEnglish
Pages (from-to)437-447
Number of pages11
JournalJournal of Electromagnetic Waves and Applications
Volume23
Issue number4
DOIs
Publication statusPublished - 2009 Feb 1

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy(all)
  • Electrical and Electronic Engineering

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