Abstract
A SU-8 polymer waveguide sensor based on local surface plasmonresonance( LSPR) was designed. The extinction model of Au nanoparticles was established. Influence of Au nanoparticle'radius and refractive index of analyte on LSPR curve was analysized. The theoretical analysis results show that the resonance wavelengths of LSPR sensor move to longwave direction when the refractive index of the analyte increases. With the increasing of Au nanoparticles' radius,the sensitivity increases and the resonance absorption peak gradually changes from one peak to two peaks. One of the peaks locates near 520 nm wavelength,mainly caused by surface plasmon absorption. Another peak which is caused by surface plasmon scattering,moves to longwave direction gradually with the increasing of Au nanoparticles' radius.
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