An LSPR Sensor based on a thin slab waveguide of bacterial cellulose

Abstract

Nowadays there is an increasing need to create eco-sustainable electronic devices. To this purpose we have developed a green sensor based on Localized Surface Plasmon Resonance (LSPR) in a thin slab waveguide of Bacterial Cellulose with ionic liquids (ILs) inside. This sensor platform is obtained by sputtering gold on the surface of a slab waveguide of BC and it could be used to realize disposable biosensors. In this work, we present how different thicknesses of the BC can affect the sensor performance, in terms of sensitivity and resolution. In particular, we have reduced the thickness of the BC slab waveguide to improve the interaction between the light and the LSPR. The experimental setup used for this extrinsic optical fiber LSPR sensor is based on two optical fibers used to connect a white light source and a spectrometer with the green LSPR sensor chip.