Localized biomolecular sensing enabled through plasmonic nanocavities

Gaël Osowiecki; Elsie Barakat; Ali Naqavi; Hans Peter Herzig

doi:10.1117/12.2052822

8 May 2014 Localized biomolecular sensing enabled through plasmonic nanocavities

Gaël Osowiecki, Elsie Barakat, Ali Naqavi, Hans Peter Herzig

Proceedings Volume 9129, Biophotonics: Photonic Solutions for Better Health Care IV; 91292B (2014) https://doi.org/10.1117/12.2052822
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

Abstract

We propose and study an integrated refractive index sensor which is based on a plasmonic slot cavity integrated on silicon-on-insulator wafers. In this device, the guided mode is vertically coupled to the cavity which is a metal-dielectricmetal waveguide and is separated from a photonic wire waveguide by a silicon dioxide spacer. We perform an in-depth study that links the geometrical parameters to the coupling and sensitivity. The strong coupling from the dielectric waveguide to the plasmonic slot waveguide cavity allows a local change in refractive index to be detectable with a high sensitivity of around 600 nm/RIU in a femto-liter volume. These results are obtained with three-dimensional time domain simulations made with the CST Microwave Studio. The sensing performance of the devices are presented and compared to the practical needs to achieve localized biomolecular sensing.

Citation Download Citation

Gaël Osowiecki, Elsie Barakat, Ali Naqavi, and Hans Peter Herzig "Localized biomolecular sensing enabled through plasmonic nanocavities", Proc. SPIE 9129, Biophotonics: Photonic Solutions for Better Health Care IV, 91292B (8 May 2014); https://doi.org/10.1117/12.2052822

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