Fabrication and characterization of laterally - graded Distributed Bragg Reflector based on porous silicon - Faustino, Maria Angela; Lopez, Lorenzo; Cainglet, Michaelrey; Oquias, R.S.; Mabilangan, A.I.; Salvador, Arnel; Somintac, Armando (Proceedings of the Samahang Pisika ng Pilipinas, 2012)