Journal
OPTICS EXPRESS
Volume 26, Issue 16, Pages 19885-19906Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.019885
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Funding
- Alfried Krupp von Bohlen und Halbach Foundation
- European Research Council (ERC) [280145]
- Robert Bosch GmbH (Renningen, Germany)
- Karlsruhe School of Optics and Photonics (KSOP)
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Waveguide-based biochemical sensors exploit detection of target molecules that bind specifically to a functionalized waveguide surface. For optimum sensitivity, the waveguide should be designed to mediate maximum influence of the surface layer on the effective refractive index of the guided mode. In this paper, we define a surface sensitivity metric which quantifies this impact and which allows to broadly compare different waveguide types and integration platforms. Focusing on silicon nitride and silicon-on-insulator (SOI) as the most common material systems, we systematically analyze and optimize a variety of waveguide types, comprising simple strips, slot and double slot structures, as well as sub-wavelength gratings (SWG). Comparing the highest achievable surface sensitivities, we provide universal design guidelines and physically interpret the observed trends and limitations. Our findings allow to select the appropriate WG platform and to optimize sensitivity for a given measurement task. (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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