Preparation and surface characterization of MEH-PPV thin semiconducting film as potential substrate for optical waveguide - Ponseca, Carlito S.; Culaba, Ivan B.; Enriquez, Erwin P.; Caluyo, Felicito S.; Culaba, Alvin B. (Proceedings of the 21st Samahang Pisika ng Pilipinas Physics Congress, 2003)