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

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 increas...

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Bibliographic Details
Published in:Optics express 2013-06, Vol.21 (12), p.14090-14096
Main Authors: Tsai, Chia-Yang, Chang, Kai-Hao, Wu, Che-Yao, Lee, Po-Tsung
Format: Article
Language:English
Subjects:
Biosensing Techniques - instrumentation
Equipment Design
Equipment Failure Analysis
Gold - chemistry
Gold - radiation effects
Metal Nanoparticles - chemistry
Metal Nanoparticles - radiation effects
Nanotechnology - instrumentation
Surface Plasmon Resonance - instrumentation
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Summary: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.21.014090