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16 September 2016 Controlled Fano resonances via symmetry breaking in metamaterials for high-sensitive infrared spectroscopy
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A high-sensitive polarized surface-enhanced infrared absorption (polarized SEIRA) is proposed and demonstrated by utilizing the resonant coupling of Fano-resonant mode of the asymmetric metamaterials and IR vibrational mode of a polymer nano-film. The asymmetric metamaterials consisting of an Au nano-rod pair with a coupling nano-antenna were fabricated and characterized to demonstrate the controlled Fano resonances at 1730 cm-1, which spectrally overlapped with the C=O stretching vibrational mode. In the co-polarized SEIRA measurement, the C=O mode of the PMMA nano-film was clearly observed as a conventional anti-resonant peak within the Fano line-shape of the metamaterial. For the cross-polarized case, on the other hand, a distinctive dip appeared within a cross-polarized transmission peak of the metamaterial. Since the unwanted background is strongly suppressed in the cross-polarized detection scheme, the signal contrast was dramatically improved, allowing for the attomole detection of the C=O bond in the far-field measurement. Our metamaterial approach achieves the significant improvement of signal-to-background ratio in the far-field measurement, thus paving the way toward the high-sensitive analysis of functional group in direct IR spectroscopy.
Conference Presentation
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Shuhei Hara, Atsushi Ishikawa, Takuo Tanaka, Yasuhiko Hayashi, and Kenji Tsuruta "Controlled Fano resonances via symmetry breaking in metamaterials for high-sensitive infrared spectroscopy", Proc. SPIE 9918, Metamaterials, Metadevices, and Metasystems 2016, 991814 (16 September 2016);

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