Plasmonic split-ring resonators as dichroic nanophotonic DNA biosensors

Clark, A.W. , Glidle, A., Cumming, D.R.S. and Cooper, J.M. (2009) Plasmonic split-ring resonators as dichroic nanophotonic DNA biosensors. Journal of the American Chemical Society, 131(48), pp. 17615-17619. (doi: 10.1021/ja905910q)

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Surface enhanced resonance Raman spectroscopy (SERRS) is a powerful molecular sensing tool that can be applied to a number of applications in the field of molecular diagnostics. We demonstrate that by using electron beam lithography to manipulate the nanoscale geometry of Ag split-ring resonators we can tune their optical properties such that they exhibit two independently addressable high frequency plasmon resonance modes for SERRS. This tailored multimodal, polarization dependent activity enables the split rings to act as discriminating sensors, with each resonance tuned for a particular sensing purpose. The structures are used as multiwavelength, multianalyte DNA SERRS sensors, with each resonance tuned to both the absorption wavelength of a differently colored Raman reporter molecule and its corresponding laser excitation wavelength. The ability of each resonance to independently sense small concentrations of a single DNA type from within a mixed population is demonstrated. Also shown is the effect of the split ring's dichroic response on the SERRS signal and the sensor's limit of detection of each resonance mode (switching its sensory reaction "on" and "off" depending on the orientation of the exciting light).

Item Type:Articles
Glasgow Author(s) Enlighten ID:Cumming, Professor David and Glidle, Dr Andrew and Cooper, Professor Jonathan and Clark, Professor Alasdair
Authors: Clark, A.W., Glidle, A., Cumming, D.R.S., and Cooper, J.M.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of the American Chemical Society
ISSN (Online):1520-5126
Published Online:13 November 2009

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