Research on surface plasmon resonance sensor based on wavelength and angular combined modulations

Yan Huang; Guoqiang Lan; Zewei Luo

doi:10.1117/12.2505316

15 November 2018 Research on surface plasmon resonance sensor based on wavelength and angular combined modulations

Yan Huang, Guoqiang Lan, Zewei Luo

Proceedings Volume 10964, Tenth International Conference on Information Optics and Photonics; 109641J (2018) https://doi.org/10.1117/12.2505316
Event: Tenth International Conference on Information Optics and Photonics (CIOP 2018), 2018, Beijing, China

Abstract

To wavelength modulation SPR sensor, the measuring sensitivity of refractive index increases with wavelength. A broadband light source (700 nm~900 nm) with relative narrow bandwidth at long wavelength is selected, to measure the refractive index of surrounding medium by using SPR reflection power spectrums, in order to obtain relatively higher sensitivity and resolution. But the measuring range of refractive index is decreased by the reduction in bandwidth of light source. We propose a surface plasmon resonance sensor based on wavelength and angular combined modulations, in order to solve the mutual restriction of measuring range and sensitivity/ resolution, sectional measurement method is adopted, i.e. different incident angles are selected respectively, which will detect different measuring ranges of refractive index. Wavelength and angular combined SPR modulations can cover the whole measuring range of refractive index, and improve the measuring sensitivity and resolution simultaneously.

Citation Download Citation

Yan Huang, Guoqiang Lan, and Zewei Luo "Research on surface plasmon resonance sensor based on wavelength and angular combined modulations", Proc. SPIE 10964, Tenth International Conference on Information Optics and Photonics, 109641J (15 November 2018); https://doi.org/10.1117/12.2505316

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KEYWORDS

Refractive index

Gold

Modulation

Sensors

Prisms

Reflectivity

Surface plasmons

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