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Proceedings Paper

Real-time and low-cost biosensors based on photonic bandgap structures
Author(s): J. García-Rupérez; J. G. Castelló; V. Toccafondo; P. Pérez-Millán
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Paper Abstract

We discuss the development of label-free, real-time and low-cost biosensors based on planar photonic bandgap (PBG) structures. We propose a novel power-based readout technique where the PBG shift is indirectly tracked by simply exciting the photonic sensing structure with a filtered broadband source and measuring the output power with a power meter. Therefore, the use of either tunable lasers or spectrum analyzers to continuously acquire the transmission spectrum of the structure, as done for other spectrum-based sensing techniques, is avoided. We have used this technique both for the sensing of refractive index variations as well as for the label-free detection of antibodies, showing high sensitivities and low detection limits, which demonstrate its high potential for the development of label-free, real-time and low-cost photonic biosensors. Furthermore, the use of broadband sources and detectors for the readout of the photonic sensors will also allow their integration, thus achieving a completely electrically accessed photonic biosensing device.

Paper Details

Date Published: 11 May 2012
PDF: 7 pages
Proc. SPIE 8431, Silicon Photonics and Photonic Integrated Circuits III, 84310O (11 May 2012); doi: 10.1117/12.921934
Show Author Affiliations
J. García-Rupérez, Univ. Politécnica de Valencia (Spain)
J. G. Castelló, Univ. Politécnica de Valencia (Spain)
V. Toccafondo, Univ. Politécnica de Valencia (Spain)
P. Pérez-Millán, Univ. Politécnica de Valencia (Spain)

Published in SPIE Proceedings Vol. 8431:
Silicon Photonics and Photonic Integrated Circuits III
Laurent Vivien; Seppo K. Honkanen; Lorenzo Pavesi; Stefano Pelli, Editor(s)

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