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Investigation of metallic nanowire-based localized surface plasmon resonance optical biosensors using extinction spectra
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- Authors
- Issue Date
- 2006-01-24
- Citation
- SPIE Internarional Symposium BiOS 2006, San Jose, California USA, 21-26 January 2006
- Keywords
- Localized surface plasmon resonance ; biosensors ; nanowires ; rigorous coupled wave analysis
- Abstract
- In this study, we investigate the impact of the cross sectional profile of an array of metallic nanowires on the feasibility
of a localized surface plasmons resonance (LSPR) biosensor. Calculations were performed using rigorous coupled wave
analysis with an emphasis on the extinction properties of the LSPR structure. It was confirmed that the resonance
spectrum strongly depends on the nanowire period and profile. Our numerical results indicate that the nanowire structure,
particularly that of a T-profile, delivers extremely linear sensing performance over a wide range of target refractive index
with much enhanced sensitivity. The extinction-based LSPR structure also involves relatively large dimension and thus
is expected to provide a feasible biosensor using current semiconductor technology.
- Language
- English
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