Impact of titanium adhesion layers on the response of arrays of metallic split-ring resonators (SRRs)

Lahiri, B., Dylewicz, R., De La Rue, R.M. and Johnson, N.P. (2010) Impact of titanium adhesion layers on the response of arrays of metallic split-ring resonators (SRRs). Optics Express, 18(11), pp. 11202-11208. (doi: 10.1364/OE.18.011202)

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At higher frequencies (visible and infrared) both the dimensions and the individual metal properties play an important role in determining the resonant response of arrays of SRRs. As a result, a substantial difference between the responses of gold-and Al-based SRR arrays has been observed. Additionally, deposition of gold SRRs onto a substrate typically involves the use of an additional adhesion layer. Titanium (Ti) is the most common adhesive thin-film material used to attach gold onto dielectric/semiconductor substrates. In this paper we investigate the impact of the Ti adhesion layer on the overall response of Au-based nano-scale SRRs. The results quantify the extent to which the overall difference in the resonance frequencies between Au- and Al-based SRRs is due to the presence of the Ti. We show that even a 2-nm-thick Ti layer can red-shift the position of SRR resonance by 20 nm. Finally, we demonstrate that by intentional addition of titanium in the Au-based SRRs, their overall resonant response can be tuned widely in frequency, but at the expense of resonance magnitude.

Item Type:Articles
Keywords:Arrays, magnetic response, optical frequencies
Glasgow Author(s) Enlighten ID:Johnson, Dr Nigel and De La Rue, Professor Richard and Dylewicz, Dr Rafal and Lahiri, Dr Basudev
Authors: Lahiri, B., Dylewicz, R., De La Rue, R.M., and Johnson, N.P.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN (Online):1094-4087

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