Patent ID: 7511820

Claim:
A surface plasmon resonance sensing system comprising: an incident light source; a sensing element; a noble metal nanoparticle layer disposed on a surface of said sensing element; said noble metal nanoparticle layer being composed of noble metal nanoparticles; a sample loading unit for allowing a sample to be contacted with said noble metal nanoparticle layer; at least one light detector for detecting an emergent light of said sensing element; wherein said sensing element is an optical fiber element, and said optical fiber element is an optical fiber where a portion of the protection layer and the cladding layer are removed, and said noble metal nanoparticle layer is disposed on said surface of said optical fiber element; wherein said emergent light of said sensing element is a transmitted light, a reflected light, or a leaked light from said optical fiber element or from a planar waveguide plate; wherein said emergent light does not include a fluorescence light; wherein said noble metal nanoparticle layer absorbs or scatters said incident light and produces said transmitted light, said reflected light, or said leaked light; and wherein said surface plasmon resonance sensing system has no polarizer between said incident light source and said sensing element for generating polarized incident light, said surface plasmon resonance sensing system has no optically active medium or polarization rotator between said sensing element and said light detector for rotating a polarization plane of a emergent light from an optical fiber, said surface plasmon resonance sensing system has no spectral filter between said sensing element and said light detector for filtering an excitation light.