IEEJ Transactions on Sensors and Micromachines
Online ISSN : 1347-5525
Print ISSN : 1341-8939
ISSN-L : 1341-8939
Special Issue Paper
Detailed Characterization of Fano Resonance in Asymmetric-double-bar Metamaterials in the Optical Region
Yuto MoritakeYoshiaki KanamoriKazuhiro Hane
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2015 Volume 135 Issue 11 Pages 426-432

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Abstract

We investigated characteristics of Fano resonance in asymmetric-double-bar (ADB) metamaterials in the optical region. An ADB structure consisted of a gold nanowire pair with slightly different bar lengths. ADB metamaterials with different sizes were fabricated by a lift-off method, and optical spectra were measured. For three kinds of fabricated ADB metamaterials with different dimensions, experimental spectra clearly showed Fano resonance at around wavelengths of 1500, 1100, and 750 nm, respectively. Characteristics of Fano resonance were estimated from optical spectra, and dependence of the degree of asymmetry was studied. The quality of Fano resonance increased with decreased in asymmetry due to a small radiative loss. In the visible region, quality of resonance was relatively small compared with that in the near-infrared region. Peak values and contrast depended on structural size of the metamaterials. The results will be useful for designing optical metamaterials with high-quality resonance.

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© 2015 by the Institute of Electrical Engineers of Japan
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