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1

CSEM Centre Suisse dElectronique 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.





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Author to whom correspondence should be addressed.



Academic Editor: Andrew M. Shaw

Abstract Despite the fact that the theoretical foundations of the sensitivity of waveguide grating based biosensors 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





Autor: Thomas E. Gartmann 1,† and Florian Kehl 1,2,3,†,*

Fuente: http://mdpi.com/



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