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25 February 2004 Determination of optical parameters of phthalocyanine LB films based on reflection property of p-polarized beam
Zhengtian Gu
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Proceedings Volume 5250, Advances in Optical Thin Films; (2004) https://doi.org/10.1117/12.509626
Event: Optical Systems Design, 2003, St. Etienne, France
Abstract
A new method is proposed for measurement of the film optical parameters. A p-polarized laser beam falls on the glass surface at θi, and two reflected beams with intensities Ia and Ib from the front and the rear surface of the glass are detected. The characteristic of the angular modulation of reflectance ratio γ ( γ =Ia/Ib) is closely related to the film optical parameters, namely refractive index nf, extinction coefficient kf and thickness df. By means of measuring the angle distribution γ(θi) and fitting the results with theoretical data, the optical parameters of the thin films can be obtained easily. Experimentally, we measured the exact optical parameters of tetra-neopentoxy phthalocyanine Zinc(TNPPcZn) LB films. In addition, the changes of optical parameters and absorption curves of TNPPcZn LB films in visible range at different annealing temperature were investigated. The results indicate that the changing tendency of the extinction coefficient of TNPPcZn LB films obtained from these two methods were coincident. When the annealing temperature increased to 150°C, the monomer of TNPPcZn in LB films transformed to aggregate, nf and kf of the films increased. Further, nf and kf decreased as aggregate changed back to monomer again at 300°C.
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Zhengtian Gu "Determination of optical parameters of phthalocyanine LB films based on reflection property of p-polarized beam", Proc. SPIE 5250, Advances in Optical Thin Films, (25 February 2004); https://doi.org/10.1117/12.509626
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KEYWORDS
Refractive index
Glasses
Absorption
Thin films
Optical testing
Reflectivity
Annealing
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