Journal
CURRENT APPLIED PHYSICS
Volume 14, Issue 4, Pages 570-574Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2014.01.015
Keywords
Metamaterials; Near-field amplification; Surface plasmon polariton; Substrate effect
Funding
- Midcareer Researcher Program [2011-0016173]
- PRC Program [2009-0094046]
- Public Welfare & Safty Research Program through National Research Foundation [2011-0020819]
- Korea Government (MEST)
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We report on the effect of dielectric substrate on the resonance shift of metallic metamaterials operating in the terahertz frequency region. The resonance frequencies for various metamaterials obtained by time-domain spectroscopy agree well with calculations based on the finite-difference time-domain method. The dependencies of the resonance frequency to substrate index are studied, and are systematically determined by introducing an effective substrate index. The relative contributions of the substrate index for various metamaterials are obtained by fitting the numerically obtained effective refractive indices as a function of substrate index, which is found to be similar to 0.63 regardless of the metamaterial geometry. (C) 2014 Elsevier B.V. All rights reserved.
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