Electron-hole production at a Schottky barrier has recently been observed experimentally as a result of chemical processes. The blends have a first component that is a polylactide polymer or a copolymer of lactide and glycolide and a second component that is poly polymer. This inventive arrangement can be utilized very universally on very differently designed microscopes and can be operated with prism systems of varying designs. When the needle is positioned directly in front of the chaplet, light is blocked from passing through the chaplet. The switch modules may be fixedly mounted within the card frame or may be removably coupled.