Slotted photonic crystal cavities with integrated microfluidics for biosensing applications

Mark Gerard Scullion, Andrea Di Falco, Thomas Fraser Krauss

Research output: Contribution to journalArticlepeer-review

175 Citations (Scopus)

Abstract

We demonstrate the detection of dissolved avidin concentrations as low as 15 nM or 1 mu g/ml using functionalized slotted photonic crystal cavities with integrated microfluidics. With a cavity sensing surface area of approximately 2.2 mu m(2), we are able to detect surface mass densities of order 60 pg/mm(2) corresponding to a bound mass of approximately 100 ag. The ultra-compact size of the sensors makes them attractive for lab-on-a-chip applications where high densities of independent sensing elements are desired within a small area. The high sensitivity over an extremely small area is due to the strong modal overlap with the analyte enabled by the slotted waveguide cavity geometry that we employ. This strong overlap results in larger shifts in the cavity peak wavelength when compared to competing approaches. (C) 2011 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)101-105
Number of pages5
JournalBiosensors and Bioelectronics
Volume27
Issue number1
DOIs
Publication statusPublished - 15 Sept 2011

Keywords

  • Slot waveguide
  • Photonic crystal
  • Slotted photonic crystal
  • Optical biosensor
  • Microfluidic
  • WHISPERING-GALLERY MODES
  • PROTEIN-DETECTION
  • CONFINING LIGHT
  • LABEL-FREE
  • SENSORS
  • NANOCAVITY
  • RESONATOR
  • SURFACES
  • PLATFORM
  • SLAB

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