Comparative study of SiO_2, Si_3N_4 and TiO_2 thin films as passivation layers for quantum cascade lasers Ferré, Simon ; Peinado, Alba ; Garcia-Caurel, Enric ; Trinité, Virginie ; Carras, Mathieu ; Ferreira, Robson Abstract Publication: Optics Express Pub Date: October 2016 DOI: 10.1364/OE.24.024032 Bibcode: 2016OExpr..2424032F