Ferroelectric thin film photonic crystal waveguide and its electro-optic properties

P. T. Lin, Zhifu Liu, Bruce W Wessels

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


The electro-optical properties of a tunable photonic crystal (PhC) thin film waveguide structure are simulated using a 2D finite difference time domain (FDTD) method. For a 2D PhC consisting of a square lattice array, the dependence of the bandgap on the air hole radius, lattice constant and filling factor are calculated. For the simulation ferroelectric barium titanate (BTO) PhC is chosen as the nonlinear medium. The calculated spectral range of the PhC waveguide is 187-207THz with a bandwidth of 20THz. A tunable superlattice PhC wide band filter was designed and its properties simulated. The passband center frequency decreases linearly with applied voltage over the frequency range of 187-194THz. Due to the large electro-optic coefficient of BTO, the calculated tunability dfc/dV is -0.18 THzV-1. Simulation indicates that the proposed PhC superlattice structure has significant advantages over conventional devices including both a much reduced size (24 × 4νm2) and large tunability of the bandgap required for future medium scale photonic integrated circuits.

Original languageEnglish (US)
Article number075005
JournalJournal of Optics A: Pure and Applied Optics
Issue number7
StatePublished - Nov 18 2009


  • Electro-optic modulators
  • Ferroelectrics
  • Photonic crystal
  • Waveguide

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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