Impact of titanium adhesion layers on the response of arrays of metallic split-ring resonators (SRRs)
Optics Express, Vol. 18, Issue 11, pp. 11202-11208 (2010)
http://dx.doi.org/10.1364/OE.18.011202
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Abstract
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.
© 2010 OSA
OCIS Codes
(160.3820) Materials : Magneto-optical materials
(160.3900) Materials : Metals
(160.4670) Materials : Optical materials
(160.4760) Materials : Optical properties
(160.3918) Materials : Metamaterials
(160.4236) Materials : Nanomaterials
(220.4241) Optical design and fabrication : Nanostructure fabrication
ToC Category:
Metamaterials
History
Original Manuscript: March 23, 2010
Revised Manuscript: April 14, 2010
Manuscript Accepted: April 30, 2010
Published: May 12, 2010
Citation
Basudev Lahiri, Rafal Dylewicz, Richard M. De La Rue, and Nigel P. Johnson, "Impact of titanium adhesion layers on the response of arrays of metallic split-ring resonators (SRRs)," Opt. Express 18, 11202-11208 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-11-11202
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