%0 Journal Article
%T Nanoporous Glass Surface for Backscattered Waveguide Fluorescence Application
%J -
%D 2018
%R https://doi.org/10.1021/acsanm.8b01837
%X Nanoporous material-based sensors promise easier integration into portable devices. Here, we use a nanoporous layer (ˇ«130 nm thick) fabricated on a cover glass as a planar waveguide and integrated sensing surface. A combination of custom-built planar waveguiding experiments and the Zemax ray tracing model confirmed that the nanoporous surface produced an increased in-plane waveguide signal output in backscattering mode. Also, by addition of a fluorophore (coumarin 6) on the surface, the nanoporous glass showed increased interactions between the dye and in-plane waveguided light, resulting in 4¨C6ˇÁ higher emission. Utilizing the nanoporous glass as an integrated chemical and mechanical surface, we report a fluorescent planar waveguide-based oxygen sensor that is operational in backscattering mode. We showed an 11ˇÁ improvement in the sensing signal upon using an appropriate filter and a ˇ«2ˇÁ overall improvement for the nanoporous glass over plain glass in oxygen sensing. The Stern¨CVolmer (SV) plot confirmed an increase in the overall interactions between the dye, waveguided light, and the analyte gas for the observed improvements. Thus, having a inbuilt nanoporous layer on glass demonstrated improved performance for a surface integrated application
%U https://pubs.acs.org/doi/10.1021/acsanm.8b01837