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Surface sensing with integrated optical waveguides: a design guideline

Milvich, Johannes 1; Kohler, Daria 1; Freude, Wolfgang 1; Koos, Christian 1
1 Institut für Photonik und Quantenelektronik (IPQ), Karlsruher Institut für Technologie (KIT)


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.

Verlagsausgabe §
DOI: 10.5445/IR/1000084982
Veröffentlicht am 01.08.2018
DOI: 10.1364/OE.26.019885
Zitationen: 20
Web of Science
Zitationen: 21
Zitationen: 24
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Photonik und Quantenelektronik (IPQ)
Universität Karlsruhe (TH) – Interfakultative Einrichtungen (Interfakultative Einrichtungen)
Karlsruhe School of Optics & Photonics (KSOP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2018
Sprache Englisch
Identifikator ISSN: 1094-4087
KITopen-ID: 1000084982
Erschienen in Optics express
Verlag Optica Publishing Group (OSA)
Band 26
Heft 16
Seiten 19885
Vorab online veröffentlicht am 24.07.2018
Nachgewiesen in Dimensions
Web of Science
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