(Ba,Sr)TiO3-based planar photonic bandgap crystal

K. L. Jim, D. Y. Wang, Chi Wah Leung, C. L. Choy, H. L W Chan

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


Index-tunable photonic crystals based on ferroelectric materials provide a means for active modulation of optical signals, and hold promises for novel device applications. In this study, (Ba,Sr)TiO3(BST)-based planar photonic crystals with different cavity geometries were modeled. Photonic crystals with square-shaped air rod geometry, which can be prepared in a straight-forward manner by interference lithography, were compared with photonic crystals having circular air rods. Calculations were performed on square lattice, with either square or circular air rods, by the plane wave expansion method. Simulation results suggested comparable bandstructures and gap maps for square or circular air rod photonic crystal, if (1) the dimension of the air rod was small compared to the electromagnetic wavelengths inside the photonic crystal being considered, or (2) the frequencies of the electromagnetic waves were less than 0.35(2πc/a). A better correlation in bandstructures and gap maps between the square and circular air rod photonic crystals can be achieved, if we compare them by the volume fractions of the photonic crystals in stead of the characteristic lengths of the rods (i.e. diameter of the circular rod and width of the square rod).
Original languageEnglish
Title of host publicationActive Photonic Crystals
Publication statusPublished - 1 Dec 2007
EventActive Photonic Crystals - San Diego, CA, United States
Duration: 28 Aug 200729 Aug 2007


ConferenceActive Photonic Crystals
Country/TerritoryUnited States
CitySan Diego, CA


  • BST
  • Cavity geometry
  • Gap map
  • Photonic crystal
  • Plane wave expansion method

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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