DEMONSTRATION OF RECIPROCITY IN THE ANGULAR PATTERN OF FLUORESCENCE EMISSION COLLECTED FROM LANGMUIR-BLODGETT DEPOSITED THIN FILMS.
Application of a principle of reciprocity results in an explicit prediction for the angular pattern of fluorescence emission which is detected in the far field from a fluorophore located in a thin film between two dielectric interfaces. With the use of the method of Langmuir-Blodgett deposition, thin films of three different thicknesses were deposited on the flat surface of a hemicyclindrical quartz prism. Each film was constructed so as to contain a plane of fluorophores located at a specific distance from the prism/film interface. According to the principle of reciprocity, a distinct angular pattern of fluorescence is predicted for each film type. This work is pertinent to biomedical engineering.
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