Mbomson, I.G. , Tabor, S., Lahiri, B., Sharp, G., McMeekin, S.G., De La Rue, R.M. and Johnson, N.P. (2017) Asymmetric split H-shape nanoantennas for molecular sensing. Biomedical Optics Express, 8(1), pp. 395-406. (doi: 10.1364/BOE.8.000395) (PMID:28101426) (PMCID:PMC5231308)
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Abstract
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 105 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.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Johnson, Dr Nigel and De La Rue, Professor Richard and Tabor, Mr Sean and Sharp, Mr Graham and Lahiri, Dr Basudev and Mbomson, Miss Ifeoma |
Authors: | Mbomson, I.G., Tabor, S., Lahiri, B., Sharp, G., McMeekin, S.G., De La Rue, R.M., and Johnson, N.P. |
College/School: | College of Science and Engineering > School of Engineering College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
Journal Name: | Biomedical Optics Express |
Publisher: | Optical Society of America |
ISSN: | 2156-7085 |
ISSN (Online): | 2156-7085 |
Published Online: | 21 December 2016 |
Copyright Holders: | Copyright © 2017 Optical Society of America |
First Published: | First published in Biomedical Optics Express 8(1):395-406 |
Publisher Policy: | Reproduced under a Creative Commons License |
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