Effect of the nanowire cross-section on the sensitivity enhancement of localized surface plasmon resonance biosensors

Kyung Min Byun; Donghyun Kim; Sung June Kim

doi:10.1117/12.644096

23 February 2006 Effect of the nanowire cross-section on the sensitivity enhancement of localized surface plasmon resonance biosensors

Kyung Min Byun, Donghyun Kim, Sung June Kim

Author Affiliations +

Proceedings Volume 6099, Plasmonics in Biology and Medicine III; 60990T (2006) https://doi.org/10.1117/12.644096
Event: SPIE BiOS, 2006, San Jose, California, United States

Abstract

In this study, localized surface plasmon resonance (SPR) biosensors with gold nanowires regularly patterned on a gold film are considered for sensitivity enhancement. The theoretical investigation was conducted using rigorous coupled wave analysis (RCWA) in terms of various design metrics, such as the resonance angle shift, the SPR curve angular width (SPR CAW), and the minimum reflectance at resonance (MRR). Especially, when LSP modes couple resonantly, broad SPR CAW and shallow MRR as well as a large shift of the resonance angle can be observed due to absorptive damping and localized coupling. The results show that, in general, nanowires of a T-profile present more effective sensitivity enhancement than an inverse T-profile. The sensitivity enhancement mediated by the presence of nanowires has been clarified qualitatively based on the dispersion relation between metal film involving nanowires and surrounding dielectric medium. Moreover, optimal design parameters of nanowires are determined based on quantitative metrics that measure the sensor performance and the fabrication reliability.

Citation Download Citation

Kyung Min Byun, Donghyun Kim, and Sung June Kim "Effect of the nanowire cross-section on the sensitivity enhancement of localized surface plasmon resonance biosensors", Proc. SPIE 6099, Plasmonics in Biology and Medicine III, 60990T (23 February 2006); https://doi.org/10.1117/12.644096

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