Enhanced White-light Photoluminescence in Hybrid Metal-dielectric Nanosponge

Creation of compact and efficient light sources is one of the fast-developing directions in nanophotonics. Here, we study hybrid nanosystem representing plasmonic nanosponge (Au) which pores are filled by high refractive index semiconductor (Si). We show experimentally that system possess broadband white light emission under irradiation by femtosecond laser pulses. Numerical studies demonstrate that in the case of three-photon excitation such system provides broadband enhancement in the region of photoluminescence. We believe hybrid metal-dielectric nanosponges can be used as universal white-light source for sensing, lab on a chip devices, etc.