Biosensing applications of all-dielectric SiO2-PDMS meta-stadium grating nanocombs

Thin film grating meta-stadium nanocombs were fabricated and experimentally investigated for the purpose of glucose monitoring. The method of ellipsometry was used to study the sensitivity of the structure to the alterations in glucose concentration in aqueous solution. The existence of Tamm surface waves was demonstrated at the interface of two dielectric mediums (PDMS and SiO2) with acceptable resolution. The results revealed the best sensitivity achieved at a 48 degrees angle of incidence over 350 450 nm visible wavelength span when the glucose concentration was varied in the range of 50 mg/l to 100 mg/l. Though the present work emphasizes on the monitoring of glucose, the structure can be used for sensing applications of other biological fluids as well. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement