Asymmetric split H-shape nanoantennas for molecular sensing

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
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Tabor, Mr Sean and Johnson, Dr Nigel and Sharp, Mr Graham and Lahiri, Dr Basudev and De La Rue, Professor Richard 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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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
642131Doctoral Training Grant 2013 - 2017Mary Beth KneafseyEngineering & Physical Sciences Research Council (EPSRC)EP/L50497X/1RSI - RESEARCH STRATEGY & INNOVATION
678901EPSRC DTG 2014Mary Beth KneafseyEngineering & Physical Sciences Research Council (EPSRC)EP/M506539/1RSI - RESEARCH STRATEGY & INNOVATION