Fabrication of dual-width plasmonic gratings with sub-10 nm gaps has been made possible by a recently developed technique. Studying the effects of various material and geometrical parameters on the optical response of these gratings will prove useful to future fabrication of devices. The ability to tune the widths of both wires in the periodic array allows for optimization of the response based not only on one nanowire geometry, but the hybridization of the two. The structures hold potential to be used as a substrate for surface-enhanced Raman spectroscopy (SERS) in the detection of different chemical analytes, with biosensing as a major area of interest. The ability to tune the structures to different wavelengths makes this a potentially attractive method of fabricating sensor substrates capable of enhancing otherwise weak analyte signals. Here, preliminary computational results are shown for a study of the effects of a SiO2 layer on the substrate containing a plasmonic grating
Stephen J. Bauman, Ahmad A. Darweesh, and Joseph B. Herzog, "Dual-width plasmonic gratings with sub-10 nm gaps for biosensor applications," Proc. SPIE 9927, Nanoengineering: Fabrication, Properties, Optics, and Devices XIII, 992709 (Presented at SPIE Nanoscience + Engineering: August 30, 2016; Published: 15 September 2016); https://doi.org/10.1117/12.2237764.
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