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Title: Near-infrared active metamaterials and their applications in tunable surface-enhanced Raman scattering
Authors: Wen, Xinglin
Zhang, Qing
Chai, Jianwei
Wong, Lai Mun
Wang, Shijie
Xiong, Qihua
Keywords: DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2014
Source: Wen, X., Zhang, Q., Chai, J., Wong, L. M., Wang, S., & Xiong, Q. (2014). Near-infrared active metamaterials and their applications in tunable surface-enhanced Raman scattering. Optics Express, 22(3), 2989-2995.
Series/Report no.: Optics express
Abstract: By utilizing the phase change properties of vanadium dioxide (VO2), we have demonstrated the tuning of the electric and magnetic modes of split ring resonators (SRRs) simultaneously within the near IR range. The electric resonance wavelength is blue-shift about 73 nm while the magnetic resonance mode is red-shifted about 126 nm during the phase transition from insulating to metallic phases. Due to the hysteresis phenomenon of VO2 phase transition, both the electric and magnetic modes shifts are hysteretic. In addition to the frequency shift, the magnetic mode has a trend to vanish due to the fact that the metallic phase VO2 has the tendency to short the gap of SRR. We have also demonstrated the application of this active metamaterials in tunable surface-enhanced Raman scattering (SERS), for a fixed excitation laser wavelength, the Raman intensity can be altered significantly by tuning the electric mode frequency of SRR, which is accomplished by controlling the phase of VO2 with an accurate temperature control.
ISSN: 1094-4087
DOI: 10.1364/OE.22.002989
Rights: © 2014 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint (preprint) with permission of Optical Society of America. The paper can be found at the following official DOI: [].  One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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