Novel concept of multi-channel fiber optic surface plasmon resonance sensor

A novel multi-channel fiber optic surface plasmon resonance (SPR) sensor is reported. The sensing structure consists of a single-mode optical fiber, covered with a thin gold layer, which supports a surface plasmon (SP), and a Bragg grating. The Bragg grating induces coupling between the forward-prop...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2009-05, Vol.139 (1), p.199-203
Main Authors: Špačková, Barbora, Piliarik, Marek, Kvasnička, Pavel, Themistos, Christos, Rajarajan, Muttukrishnan, Homola, Jiří
Format: Article
Language:English
Subjects:
Biosensor
Bragg grating
Fiber optic
Surface plasmon resonance
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Summary:A novel multi-channel fiber optic surface plasmon resonance (SPR) sensor is reported. The sensing structure consists of a single-mode optical fiber, covered with a thin gold layer, which supports a surface plasmon (SP), and a Bragg grating. The Bragg grating induces coupling between the forward-propagating fundamental core mode and the back-propagating SP-cladding mode. As the SP-cladding modes are highly sensitive to changes in the refractive index of the surrounding medium, the changes can be accurately measured by spectroscopy of these hybrid modes. Multichannel capability is achieved by employing a sequence of Bragg gratings of different periods and their reading via the wavelength division multiplexing. Theoretical analysis and optimization based on the coupled-mode theory (CMT) is carried out and performance characteristics of the sensor are determined.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2008.12.020