Application of a Near-field Optical Microscope to Investigate the Fluorescence Energy Transfer Between Chromophores Embedded in Langmuir-Blodgett Films
✍ Scribed by Brunner, R.; Bietsch, A.; Hollricher, O.; Marti, O.; Lambacher, A.
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 308 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0142-2421
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✦ Synopsis
Scanning near-Ðeld optical microscopy (SNOM) was used to investigate the Ñuorescence energy transfer between a monomolecular Ðlm of monomethin oxacyanine and a layer of monomethin thiacyanine in arachidic acid. The donor and acceptor chromophores are Ðxed in Langmuir-Blodgett (LB) Ðlms, spaced by the identical chains of the arachidic acid and dye, respectively. The length of these hydrophobic chains guarantees a Ðxed distance between the di †erent kinds of chromophores. The dye molecules are oriented parallel to the plane of the LB Ðlm. In the LB layer assembly, a step was prepared to separate two di †erent regions. One area contains both kinds of chromphores, whereas in the other area only the donor dyes are present.
We used the SNOM technique because of the possibility to measure simultaneously the Ñuorescence behaviour and topographical structure.