Abstract
Localized surface plasmon resonance (LSPR) sensor is constructed by immobilizing gold nanoparticles (AuNPs) on the surface of hetero-core structured fiber optic and characterized as a refractive index sensor. According to increasing of dipping time of the aminated sensing part in the AuNPs suspension, the propagating light intensity near 545nm decreased. According to increasing of the sensor length, in addition, the propagating light intensity at 540nm decreased. The sensor showed that the propagating loss at 545nm increased according to increasing of ethanol concentration in water, derived from the refractive index increase of the mixture.
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