AN # 131使用MP-SPR技术的深扫描光学现象测定微米尺度层的光学特性和相互作用

Optical biosensor techniques based on evanescent field sensing, like surface plasmon resonance (SPR) have typically an effective detection depth of a hundred nanometers. For many coating-interaction studies coatings of this thickness can be difficult to achieve. Optical waveguides are phenomenon that can occur in structures able to capture and internally reflect light. A related optical phenomena, so-called SPR waveguide mode, might occur when between metal and the sample medium is a dielectric guiding layer with sufficiently high dielectric constant (ε) and thickness (d) (Fig. 1). The plasmon excitation by the visible light can be exited at several angles which are dependent on the whole optical system properties, and an angular spectrum of reflected light intensity (SPR-angular curve) will show several minima (Fig. 2).