Ultrasensitive gas-phase chemical sensing based on functionalized photonic crystal nanobeam cavities

Yu Chen, William S. Fegadolli, William M. Jones, Axel Scherer, Mo Li

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

Photonic crystal nanobeam cavities with high-quality factors are very sensitive to the changes of the dielectric properties of their surroundings. Utilizing this high sensitivity and by applying chemical functionalization, an ultrasensitive chemical sensor for gases based on a nanobeam cavity was demonstrated. A limit of detection of 1.5 parts-per-billion (ppb) in ambient conditions, determined from the noise level of the system, was achieved for nerve agent simulant methyl salicylate. The nanobeam cavity's nonlinear thermo-optical bistability is also utilized to realize a threshold detector for cumulative chemical exposure.

Original languageEnglish (US)
Pages (from-to)522-527
Number of pages6
JournalACS nano
Volume8
Issue number1
DOIs
StatePublished - Jan 28 2014

Keywords

  • chemical sensor
  • photonic crystal cavity
  • thermo-optical bistability

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