Asymmetric split H-shape nanoantennas for molecular sensing.
| Autor: | Mbomson IG; School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK., Tabor S; School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK., Lahiri B; School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK., Sharp G; School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK., McMeekin SG; School of Computing and Engineering, Glasgow Caledonian University, Glasgow, G4 0BA, UK., De La Rue RM; School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK., Johnson NP; School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK. |
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| Jazyk: | angličtina |
| Zdroj: | Biomedical optics express [Biomed Opt Express] 2016 Dec 21; Vol. 8 (1), pp. 395-406. Date of Electronic Publication: 2016 Dec 21 (Print Publication: 2017). |
| DOI: | 10.1364/BOE.8.000395 |
| Abstrakt: | In this paper we report on a very sensitive biosensor based on gold asymmetric nanoantennas that are capable of enhancing the molecular resonances of C-H bonds. The nanoantennas are arranged as arrays of asymmetric-split H-shape (ASH) structures, tuned to produce plasmonic resonances with reflectance double peaks within the mid-infrared vibrational resonances of C-H bonds for the assay of deposited films of the molecule 17β-estradiol (E2), used as an analyte. Measurements and numerical simulations of the reflectance spectra have enabled an estimated enhancement factor on the order of 10 5 to be obtained for a thin film of E2 on the ASH array. A high sensitivity value of 2335 nm/RIU was achieved, together with a figure of merit of approximately 8. Our experimental results were corroborated using numerical simulations for the C-H stretch vibrational resonances from the analyte, superimposed on the plasmonic resonances of the ASH nanoantennas. |
| Databáze: | MEDLINE |
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