The surface plasmon resonance technique was used for imaging of the dielectric sample.Based on a large numerical aperture microscope objective configuration,a light beam from a He-Ne laser(λ=632.8nm)was converged to excite surface plasmon resonance on gold film.The image of Si3N4grating on the gold film was acquired by using a slit which restricts the incident angle of imaging beam.CCD was placed to detect the reflected light and get the surface plasmon resonance image of the sample at the conjugate plane o...