Light scattering and Fano resonances in high-Q photonic crystal nanocavities

M. Galli, S. L. Portalupi, M. Belotti, L. C. Andreani, Liam O'Faolain, T. F. Krauss

Research output: Contribution to journalArticlepeer-review

187 Citations (Scopus)

Abstract

The authors show that light scattering from high-Q planar photonic crystal nanocavities can display Fano-like resonances corresponding to the excitation of localized cavity modes. By changing the scattering conditions, we are able to tune the observed lineshapes from strongly asymmetric and dispersivelike resonances to symmetric Lorentzians. Results are interpreted according to the Fano model of quantum interference between two coupled scattering channels. Combined measurements and line shape analysis on a series of silicon L3 nanocavities as a function of nearby hole displacement demonstrate that Q factors as high as 1.1x10(5) can be directly measured in these structures. Furthermore, a comparison with theoretically calculated Q factors allows to extract the rms deviation of hole radii due to weak disorder of the photonic lattice.

Original languageEnglish
Number of pages3
JournalApplied Physics Letters
Volume94
Issue number7
DOIs
Publication statusPublished - 16 Feb 2009

Keywords

  • light scattering
  • photonic crystals
  • Q-factor
  • quantum interference phenomena
  • WAVE-GUIDES
  • PROPAGATION

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