[Show abstract][Hide abstract] ABSTRACT: Tapered fiber tips with different geometries are fabricated for developing a fiber optic biosensor. Fluorescence experiments are performed to compare the coupling efficiency of light for different fiber tip configurations. When light is generated in a `thick' layer (> 1 micrometers ) around a fiber core, the continuously tapered tip with the steepest taper collects light more efficiently than the longer combination tapered tip. To demonstrate the applicability of our results, we have successfully detected weak chemiluminescent signal collected by a bundle of fibers with the short continuously tapered tips using a cooled CCD array detector. The chemiluminescence reaction was catalyzed by alkaline phosphatase immobilized on the fiber tips by a sol-gel technique.
[Show abstract][Hide abstract] ABSTRACT: We report our development of biomaterials for information processing and signal transduction by incorporation of photodynamic proteins into conducting polymer and sol-gel matrices. Our aim is to develop biomaterials with high optical quality, good thermal and mechanical stability, and superior opto-electronic characteristics for applications in biosensor, signal transduction, and information processing. A novel three-dimensional optical memory system based on a light transducing protein, bacteriorhodopsin, is designed and demonstrated.