1. Refractometric sensing of silicon layer coupled plasmonic–colloidal crystals.
- Author
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Liu, Zhengqi, Liu, Guiqiang, Shao, Huibai, Liu, Xiaoshan, Liu, Mulin, Huang, Shan, Fu, Guolan, Xu, Hualan, and Gao, Huogui
- Subjects
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REFRACTOMETERS , *SILICON compounds , *PLASMONICS , *COLLOIDAL crystals , *NANOSTRUCTURED materials - Abstract
Plasmonic–colloidal crystals are with unique optical properties due to the combination of the plasmonic and photonic features. In this paper, we demonstrate a novel dual-band plasmonic refractometric sensing motif by using a metal film coated colloidal crystal (CC) intercalated with a silicon (Si) layer (M–Si–CC), where the Si layer can simultaneously couple with the top plasmonic crystal and the bottom CC. Distinct sensing behaviors of the two transmittance peaks are observed. In addition, significantly improved sensitivity is achieved in comparison with those of the conventional metal coated CCs (M–CCs). Moreover, the structure is with quite simple design and could be fabricated in a straightforward manner over large areas. These features hold the proposed motif with potential applications in multispectral biosensing and detection. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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