Patent ID: 8216518

Claim:
A localized plasmon resonance sensing apparatus, comprising: a tubular waveguide component, having a tubular internal wall and a sealed bottom, the tubular waveguide component allowing a plurality of total internal reflections of an incident light, which is consisting of a single frequency light or a narrowband light, such that the incident light enters into and exits from opposite sides of the tubular waveguide component; and a noble metal nanoparticle layer, composed of a plurality of noble metal nanoparticles each consisting of a noble metal and disposed on a surface of the tubular internal wall; wherein when a desired testing sample is disposed inside the tubular waveguide component, the noble metal nanoparticles contact with the desired testing sample and results in a signal change of light attenuation of said incident light by a localized plasmon resonance effect, wherein the plurality of total internal reflections of the incident light by the tubular waveguide component accumulates the signal change of light attenuation to thereby improve sensitivity of the localized plasmon resonance sensing apparatus.