D-type fiber biosensor based on surface-plasmon resonance technology and heterodyne interferometry

Ming Hung Chiu, Shinn Fwu Wang, Rong Seng Chang

Research output: Contribution to journalArticlepeer-review

130 Scopus citations

Abstract

A D-type fiber biosensor based on surface-plasmon resonance (SPR) technology and heterodyne interferometry is presented. The sensing device is a single-mode optical fiber in which half the core is polished away and a thin-film layer of gold is deposited. We measure the phase-difference variations instead of the light intensity as in traditional SPR techniques. Therefore the accuracy and resolution of our method are very high. Its sensitivity can reach 2 × 10-6 refractive-index units. The sensor has some merits, e.g., tunable high sensitivity, small size, lower cost, smaller sample volume, and suitability for in vivo testing. This novel method of a D-type fiber biosensor based on SPR technology and heterodyne interferometry is valuable for chemical, biological, and biochemical sensing, and the novel method of D-type fiber biosensing is a feasible means of study.

Original languageEnglish
Pages (from-to)233-235
Number of pages3
JournalOptics Letters
Volume30
Issue number3
DOIs
StatePublished - 1 Feb 2005

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