Patent ID: 7728979

Claim:
A method for detecting object properties using electro-optically modulated surface plasmon resonance (SPR) based on phase detection, the method comprising: inputting optical wave to an electro-optically modulated SPR sensing device; applying a voltage on the electro-optically modulated SPR sensing device to produce electrical field in an electro-optical crystal of the electro-optically modulated SPR sensing device; measuring relation between phase of output optical wave from the electro-optically modulated SPR sensing device and the applied voltage; using linearity regression analysis to compute measured slope of the regression straight line of the relation between the phase of output optical wave and the applied voltage; using calibration data of the relation between the slope of the regression straight line and concentration or material property of a standard solution or a standard material to compute concentration or material property corresponding to the measured slope of the regression straight line, wherein the concentration or the material property of the object is determined by the concentration or the material property corresponding to the measured slope of the regression straight line.