Chemical sensing in slotted photonic crystal heterostructure cavities

Andrea Di Falco, Liam O'Faolain, Thomas Fraser Krauss

Research output: Contribution to journalArticlepeer-review

273 Citations (Scopus)


We fabricated slotted photonic crystal waveguides and cavities supporting resonant modes in air. Their peculiar geometry enables the detection of refractive index changes in a given analyte with high sensitivity because of the large overlap between the optical mode and the analyte. This yields a high figure of merit for the sensitivity of the device and we are able to report values of S=Delta lambda/Delta n over 1500. By applying a photonic crystal heterostructure to the slotted geometry, we are able to create high quality-factor cavities essential for realizing low detection limits up to Q=50 000.

Original languageEnglish
Article number063503
Number of pages3
JournalApplied Physics Letters
Issue number6
Publication statusPublished - 9 Feb 2009


  • chemical sensors
  • photonic crystals
  • refractive index
  • voids (solid)


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