RERADIATION AND IMAGING OF DIFFUSE PHOTON DENSITY WAVES USING FLUORESCENT INHOMOGENEITIES

Experiments demonstrate the reradiation of diffuse photon density waves in turbid media by an obstacle filled with fluorescent dye. The reradiated energy was also in the form of a diffuse density wave that was readily detected at the red-shifted energy. In this process the inhomogeneity was converted into a source of diffuse photon density waves, and localization of the object can be accomplished by analysis of the reradiated wavefronts. We will discuss these measurements and demonstrate some simple practical devices which are capable of localizing the center of such a fluorescent inhomogeneity.