Patent ID: 9678009
Date: 2017-06-13
CPC Classifications: G01N

Claim:
1. A method for a localized surface plasmon resonance (LSPR) sensing system having an optical detection system and a test specimen with a plurality of metal nanoparticles arranged in an anisotropic periodic manner that generates a phase signal of the LSPR sensing system, the method comprising: emitting an incident light toward the test specimen to excite the metal nanoparticles, thereby generating an emergent light; using the optical detection system to detect phases of a first polarization state and a second polarization state of the emergent light, wherein the first polarization state is perpendicular to the second polarization state; obtaining a phase difference spectrum between the phases of the first and second polarization states, thereby determining a half maximum (FWHM) of the phase difference spectrum; and monitoring a spectral shift of the phase signal to detect a change of an environment refractive index associated with the metal nanoparticles.