Among these characteristics, the screen is composed of multiple anisotropic sources, each of them at slightly different angles with respect to the prism, which enables the obtained angle resolved images, where each image pixel is reporting on a dominant incident angle, in contrast to angle scanned illumination in SPR instruments. A ∼5◦ range of illuminating angles is selected by the small camera aperture in the present arrangement, as indicated by the image forming path in Fig. 1b.