The present invention provides a sensing method and device based on
sensing surface plasmon resonance which can be controlled by the
electro-optical modulation. In the case of an integrated-optic device
according to the present invention, a voltage is applied on an
electro-optical crystal substrate surface with waveguides to modulate the
surface plasmon resonance condition on the sensing waveguide.
Concentrations of chemicals or bio-chemicals contained in a sample placed
on the sensing waveguide can be determined by measuring the dependence of
the output light intensity on the applied voltage. Because spectrometer
is not needed for measuring the surface plasmon resonance wavelength,
drawbacks of conventional integrated-optic surface plasmon resonance
sensors, like limited sensitivity, high cost and restrictions on
circumstances for measuring, are avoided. The present invention can be
applied for real-time dynamic analyses on sample's changes. Therefore, it
can be extensively applied in the fields associated with tests of
chemical gases and various solutions, pollution monitoring and bio-chips
etc.