Numerical studies of 2D photonic crystals: Waveguides, coupling between waveguides and filters

R. Stoffer, H.J.W.M. Hoekstra, R.M. de Ridder, E. van Groesen, F.P.H. van Beckum

    Research output: Contribution to journalArticleAcademicpeer-review

    56 Citations (Scopus)

    Abstract

    In photonic crystals, light propagation is forbidden in a certain wavelength range, the bandgap. In a two-dimensional crystal composed of parallel high-refractive index rods in a low-index background a line defect can be formed by removing a row of these rods, which can act as a waveguide for frequencies in the bandgap of the crystal. In order to get more insight into the main features of such waveguides we have studied a number of properties, using simulation tools based on the finite difference time domain method and a finite element Helmholtz solver. We show conceptually simple methods for determining the bandgap of the crystal as well as the dispersion of a waveguide for wavelengths in this bandgap. For practical applications, it is also important to know how much light can be coupled into the waveguide. Therefore, the coupling of light from a dielectric slab waveguide into the photonic crystal waveguide has been examined, showing that a coupling efficiency of up to 83% can be obtained between a silicon oxide slab and a waveguide in a crystal of silicon rods. Finally, calculations on an ultra-compact filter based on reflectively terminated side-branches of waveguides (similar to tuned stubs in microwave engineering) are shown and discussed.
    Original languageEnglish
    Pages (from-to)947-961
    JournalOptical and quantum electronics
    Volume32
    Issue number6-8
    DOIs
    Publication statusPublished - 2000

    Keywords

    • Numerical modelling
    • Photonic bandgap crystals
    • Wavelength filter

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