IN-SITU OPTICAL MEASUREMENT OF ADSORPTION OF LANGMUIR-BLODGETT-FILMS DEPOSITED ON OPTICAL FIBERS

Langmuir-Blodgett (LB) films containing functional dyes were deposited directly onto optical fibers by the adsorption LB method. A merocyani ne derivative having a long alkyl chain and rhodamine B were used as s preading and adsorbing molecules from the aqueous subphase, respective ly. During the LB film deposition, absorption spectra from the optical interaction with the LB films at the core portion of the fiber were m onitored using a multi-channel photo-detector system. Furthermore, the influence of the excitation light, which was guided into the fiber du ring the deposition, on the film deposition was investigated. The expe rimental results indicated that the in-situ optical measurement using optical fibers has high sensitivity and this is one of the promising m ethods to investigate the molecular interactions and the effect of the incident light on the LB film deposition.