Ultraviolet Imaging Based on Surface Plasmon Resonance With Azo-Polymer Sensing Layer

An innovative surface plasmon resonance (SPR) sensor is constructed to achieve ultraviolet (UV) imaging. The SPR sensor is fabricated using a gold-coated prism, which is then overlaid with an azo-polymer film as a UV sensing layer. The refractive index of the azo-polymer decreases during UV light irradiation. The changes of the refractive index influence the intensity of the light reflected from the SPR sensor. With a CCD camera, both the images of the light beams reflected from the SPR sensor before and after UV irradiation are recorded. The shape of UV light beam intensity distribution can then be calculated by comparing the difference between these two images.