Highly sensitive, localized surface plasmon resonance fiber device for environmental sensing, based upon a structured bi-metal array of nano-wires

Thomas D.P. Allsop*, Ron Neal, Chengbo Mou, Kyriacos Kalli, David J. Webb

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

We demonstrate a bi-metal coated (platinum and gold or silver), localized surface plasmon resonance fiber sensor with an index sensitivity exceeding 11,900 nm/RIU, yielding an index resolution of 2 × 10-5 in the aqueous index regime. This is one of the highest index sensitivities achieved with an optical fiber sensor. The coatings consist of arrays of bi-metal nano-wires (typically 36 nm in radius and 20 μm in length), supported by a silicon dioxide thin film on a thin substrate of germanium, the nano-wires being perpendicular to the longitudinal axis of the D-shaped fiber.

Original languageEnglish
Pages (from-to)5798-5801
Number of pages4
JournalOptics Letters
Volume39
Issue number20
DOIs
Publication statusPublished - 15 Oct 2014

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Funding: EPSRC (EP/J010413)

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