Carrier diffusion and recombination in photonic crystal nanocavity optical switches

Takasumi Tanabe, Hideaki Taniyama, Masaya Notomi

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)


Carrier dynamics in silicon photonic crystal (PhC) nanocavities are studied numerically. The results agree well with previous experimental demonstrations. It is shown that the presence of carrier diffusion makes fast switching possible, which is an advantage of nanocavity switches over other types of larger carrier based nonlinear optical switches. In particular, diffusion is effective in PhC nanocavity switches, which makes the switching recovery time even faster than that of silicon waveguide-based optical switches. In addition, calculations suggest that the thermo-optic effect can be reduced if the carriers are extracted within a few 100 ps by introducing a p-i-n structure.

Original languageEnglish
Pages (from-to)1396-1403
Number of pages8
JournalJournal of Lightwave Technology
Issue number11
Publication statusPublished - 2008 Jun 1
Externally publishedYes


  • Charge carrier processes
  • Optical resonators
  • Optical switches
  • Periodic structures

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Carrier diffusion and recombination in photonic crystal nanocavity optical switches'. Together they form a unique fingerprint.

Cite this