Comparative Raman analysis of porous silicon DBRs before and after lift-off under visible and near-infrared laser excitation - Lopez, Joybelle; Husay, Horace Andrew; Vasquez, John Daniel; Ahmad, Al-Khadeem; Hojo, Hiroshi; Fidelson, Jarzen Kobe; Somintac, Armando (Proceedings of the 43rd Samahang Pisika ng Pilipinas Physics Conference, 2025)