META Conference, META'10

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The effect of titanium adhesion layers on the optical response of split ring resonators
Basudev Lahiri, Rafal Dylewicz, Scott G McMeekin, Richard M De La Rue, Nigel P Johnson

Last modified: 2009-11-04


The optical response of Split Ring Resonators (SRRs) scales linearly with its dimensions down to micron dimensions. At smaller dimensions and higher frequencies, metals stop behaving like perfect conductors and start displaying their individual properties according to the Drude model. In this presentation we compare responses of similar sized gold and aluminium based SRRs at telecom wavelengths. To attach gold to a substrate (silicon in our case), an adhesive layer is required. We have employed titanium, a commonly used adhesive layer, for sticking gold to the silicon substrate. By varying the fraction of titanium to gold we are able to attribute a red shift in the optical response of gold based SRRs of around 20 nm for at little as 2 nm thickness of this adhesive layer. We similarly compare a blue shift in response obtained from similar sized SRRs made from aluminium.