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Photonics 2015, 2(1), 124-138; doi:10.3390/photonics2010124

Design of a Label-Free, Distributed Bragg Grating Resonator Based Dielectric Waveguide Biosensor

1
Laboratory of Biosensors and Bioelectronics (LBB), Swiss Federal Institute of Technology ETH, Gloriastrasse 35, Zürich CH-8092, Switzerland
2
CSEM Centre Suisse d'Electronique et de Microtechnique SA, Bahnhofstrasse 1, Landquart CH-7302, Switzerland
3
Optics Balzers AG, Neugrüt 35, Balzers FL-9496, Liechtenstein
4
University of Applied Sciences and Technology NTB, Werdenbergstrasse 4, Buchs CH-9470, Switzerland
5
CSEM Centre Suisse d'Electronique et de Microtechnique SA, Rue Jaquet-Droz 1, Neuchâtel CH-2002, Switzerland
*
Author to whom correspondence should be addressed.
Received: 24 December 2014 / Accepted: 22 January 2015 / Published: 29 January 2015
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Abstract

In this work, we present a resonant, dielectric waveguide device based on distributed Bragg gratings for label-free biosensing applications. The refractive index sensitive optical transducer aims at improving the performance of planar waveguide grating sensor systems with limited Q-factor and dynamic range by combing the advantages of resonant cavities, such as a multitude of resonance peaks with high finesse, with the manageable complexity of waveguide grating couplers. The general sensor concept is introduced and supported by theoretical considerations as well as numerical simulations based on Coupled Mode Theory. In contrast to a single Bragg grating reflector, the presented Fabry-Pérot type distributed Bragg resonator exhibits an extended measurement range as well as relaxed fabrication tolerances. The resulting, relatively simple sensor structure can be fabricated with standard lithographic means and is independent of expensive light-sources and/or detectors, making an affordable but sensitive device, potentially suitable for point-of-care applications. View Full-Text
Keywords: diffraction gratings; waveguide grating couplers; optical resonators; fabry-pérot; Bragg reflectors; planar waveguides; label-free biosensing diffraction gratings; waveguide grating couplers; optical resonators; fabry-pérot; Bragg reflectors; planar waveguides; label-free biosensing
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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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MDPI and ACS Style

Kehl, F.; Bischof, D.; Michler, M.; Keka, M.; Stanley, R. Design of a Label-Free, Distributed Bragg Grating Resonator Based Dielectric Waveguide Biosensor. Photonics 2015, 2, 124-138.

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