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

Chia-Yang Tsai | Zendy; Kai-Hao Chang | Zendy; Che-Yao Wu | Zendy; Po-Tsung Lee | Zendy

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

Author(s) -

Chia-Yang Tsai,

Kai-Hao Chang,

Che-Yao Wu,

Po-Tsung Lee

Publication year - 2013

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.21.014090

Subject(s) - nanoring , plasmon , materials science , aspect ratio (aeronautics) , biosensor , optics , surface plasmon , transverse plane , longitudinal mode , infrared , wavelength , optoelectronics , nanotechnology , physics , structural engineering , engineering

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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