Enhanced terahertz emission of semi – insulating gallium arsenide with metal grating structures - Faustino, Maria Angela B.; Lopez, Lorenzo F.; Afalla, Jessica Pauline; Felix, Mark Jayson; Muldera, Joselito; Ferrolino, John Paul; Salvador, Arnel A.; Somintac, Armando S.; Estacio, Elmer S. (Proceedings of the 33rd Samahang Pisika ng Pilipinas Physics Congress, 2015)