Analysis of optical reflection in a chirped distributed bragg reflector

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

    Research output: Contribution to journalArticlepeer-review

    27 Citations (Scopus)

    Abstract

    A theoretical analysis of optical reflection for a dielectric chirped distributed Bragg reflector (DBR) is presented. The chirped DBR is modeled by several sub-DBRs stacked successively with different values in the thickness ratio, ρ = d 2/d 1, where d 2 and d 1 are the thicknesses of two constituent dielectric layers. Reflection spectra are numerically calculated and analyzed by making use of the transfer matrix method in a stratified medium. The results show that such a chirped structure has a weak effect on the fundamental bandgap, but the higher order bandgaps are strongly affected. The second bandgap is apparently broadened due to the shift in its lower band edge. Results of spectra for both TE and TM waves at different incident angles are also given and discussed.

    Original languageEnglish
    Pages (from-to)129-138
    Number of pages10
    JournalJournal of Electromagnetic Waves and Applications
    Volume23
    Issue number1
    DOIs
    Publication statusPublished - 2009 Feb 1

    ASJC Scopus subject areas

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

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