A channel drop filter using a single defect in a 2-D photonic crystal slab - Defect engineering with respect to polarization mode and ratio of emissions from upper and lower sides

Takashi Asano, Masamitsu Mochizuki, Susumu Noda, Makoto Okano, Masahiro Imada

Research output: Contribution to journalArticle

35 Citations (Scopus)


A detailed theoretical analysis of defect engineering in a channel drop filter consisting of a single point defect near a waveguide in a two-dimensional (2-D) photonic crystal (PC) slab is presented. Initially, engineering of the point defect to control the polarization modes of emitted light is examined. By introducing an elliptical defect laterally shifted from the PC lattice, a single linearly polarized light mode can be selected to emit the majority of light, whereas light emitted from the original circular defect is made up of a range of linearly polarized modes. It is also shown that the ratio of light emitted from the top and bottom side of the defect can be improved considerably by introducing a defect with a stepped section along the vertical axis, thereby increasing the net efficiency of the device.

Original languageEnglish
Pages (from-to)1370-1376
Number of pages7
JournalJournal of Lightwave Technology
Issue number5
Publication statusPublished - 2003 May 1
Externally publishedYes



  • Dropping efficiency
  • Nano-cavity
  • Optical filter
  • Photonic crystal (PC)
  • Polarization control
  • Vertical asymmetry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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