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

Chia Yang Tsai, Kai Hao Chang, Che Yao Wu, Po-Tsung Lee*

*Corresponding author for this work

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)14090-14096
Number of pages7
JournalOptics Express
Volume21
Issue number12
DOIs
StatePublished - 1 Jan 2013

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