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Opt Express. 2013 Jun 17;21(12):14090-6. doi: 10.1364/OE.21.014090.

The aspect ratio effect on plasmonic properties and biosensing of bonding mode in gold elliptical nanoring arrays.

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Department of Photonic & Institute of Electro-Optical Engineering, National Chiao Tung University, Rm. 413, CPT Building, 1001 Ta-Hsueh Road, Hsinchu 30010, Taiwan.


We investigate both numerically and experimentally the optical properties and biosensing of gold elliptical nanoring (ENR) arrays with various aspect ratios. The gold ENR exhibits a strong localized surface plasmon bonding mode in near-infrared region, whose peak wavelength is red-shifted as increasing the aspect ratio under longitudinal and transverse polarizations. Furthermore, the disk- and hole-like optical properties for longitudinal and transverse modes are observed, which cause different behaviors in field intensity enhancement. For biomolecule sensing, we find that both modes show increased surface sensitivities when enlarging the aspect ratio of gold ENR.

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