Characterization of a field-assist multi-pass fibre optic surface plasmon resonance sensor

Hyungduk Ko*, Chin B. Su, Jun Kameoka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A fibre optic multiple-pass surface plasmon resonance (SPR) sensor coupled with a field-assist capability for detecting extremely low concentrations of charged particles is demonstrated for the first time. The field-assist feature forces charged particles/molecules to the SPR surface, increasing the local concentration for detection and thus the sensitivity by an additional factor of about 100. A 10 pM concentration of 47 nm diameter polystyrene (PS) latex beads and 2 νM concentration of salt dissolved in DI water were detected within a few seconds. The equivalent index resolution for atomic size corresponding to ionized chlorine in salt is 2.6 × 10-8. This technique should offer the potential for the sensitive and fast detection of analytes in a solution.

Original languageEnglish
Pages (from-to)2938-2942
Number of pages5
JournalMeasurement Science and Technology
Issue number9
Publication statusPublished - 2007 Sept 1
Externally publishedYes


  • Fibre optic SPR sensor
  • Multi-pass SPR sensor
  • Surface plasmon resonance

ASJC Scopus subject areas

  • Instrumentation
  • Engineering (miscellaneous)
  • Applied Mathematics


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