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Biosensors 2015, 5(2), 187-198; doi:10.3390/bios5020187

Experimental Validation of the Sensitivity of Waveguide Grating Based Refractometric (Bio)sensors

1,†
and
1,2,3,†,*
1
CSEM Centre Suisse d'Electronique et de Microtechnique SA, Bahnhofstrasse 1, Landquart CH-7302, Switzerland
2
Laboratory of Biosensors and Bioelectronics (LBB), Swiss Federal Institute of Technology ETH, Gloriastrasse 35, Zürich CH-8092, Switzerland
3
Optics Balzers AG, Neugrüt 35, Balzers FL-9496, Liechtenstein
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Andrew M. Shaw
Received: 17 February 2015 / Revised: 30 March 2015 / Accepted: 3 April 2015 / Published: 13 April 2015
(This article belongs to the Special Issue Label-Free Biosensors: Exploring the Field)
View Full-Text   |   Download PDF [980 KB, uploaded 14 April 2015]   |  

Abstract

Despite the fact that the theoretical foundations of the sensitivity of waveguide grating based (bio)sensors are well-known, understood and their implications anticipated by the scientific community since several decades, to our knowledge, no prior publication has experimentally confirmed waveguide sensitivity for multiple film thicknesses, wavelengths and polarization of the propagating light. In this paper, the bulk refractive index sensitivity versus waveguide thickness of said refractometric sensors is experimentally determined and compared with predictions based on established theory. The effective refractive indices and the corresponding sensitivity were determined via the sensors’ coupling angles at different cover refractive indices for transverse electric as well as transverse magnetic polarized illumination at various wavelengths in the visible and near-infrared. The theoretical sensitivity was calculated by solving the mode equation for a three layer waveguide. View Full-Text
Keywords: waveguide grating sensor; grating coupler; integrated optics; bulk refractive index sensitivity waveguide grating sensor; grating coupler; integrated optics; bulk refractive index sensitivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gartmann, T.E.; Kehl, F. Experimental Validation of the Sensitivity of Waveguide Grating Based Refractometric (Bio)sensors. Biosensors 2015, 5, 187-198.

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