We have tried to develop the technology for selective bleaching of core patterns of waveguides on polysilane films by UV light irradiation without wet development and RIE process. Furthermore, we have examined heat treatment of films in order to make transmission loss low instead of introducing fluorine groups in the polymer structure which conventional polymeric material are applied. As a waveguide device, evaluation of low loss straight-line waveguides and multilayered laminating type waveguides at 850nm for MM, and splitter of 8 branches (1×8) at 1550nm for SM was carried out. This new technology is expected to establish the low-cost manufacturing process of optical waveguides which are important components of passive optical devices for PON (passive optical network) system and optical interconnects.

According to van Oss et al., surface acidity parameter y+, and basicity parameter y-, together with dispersive force parameter y' of paint films and substrates were determined by contact angle measurements. Hexane, diiodomethane and ethylene glycol were used as diagnostic liquids. The interfacial tension ysp between a paint film and a substrate was calculated from these parameters and correlated to their adhesion behavior. A negative value of ysp was an indication of excellent adhesion, in practice.