Abstract
The advancement of developing spaser devices operated upon electrical pumping has attracted popular attentions, but suffering from several challenges including rational cavity configuration, nonradiative recombination loss, Joule heating, metallic loss and other aspects. Herein, we experimentally exhibit an electrically-driven spaser device, which is composed of one Ga-doped ZnO (ZnO:Ga) microribbon crossed with another Au nanoparticles-embedded ZnO:Ga (AuNPs@ZnO:Ga) microribbon that are linked through ballistic interconnects. The spaser emits at a wavelength of approximately 550 nm, which could be resulted from light amplification of the sandwiched AuNPs plasmons. Experimental investigation reveals that the AuNPs@ZnO:Ga⊗ZnO:Ga microribbon crossed structure exhibits quasi-Schottky junction characteristics, which allows to energetize the current passing through the crossed area, thus generating hot electrons. While, the smoothness surfaces of the ZnO:Ga microribbons, by combining with the sandwiched AuNPs, enable to construct plasmonic nanocavity (the crossed ZnO:Ga-AuNPs-ZnO:Ga structure). In which the light-emission can be plasmonically confined at the subwavelength scale with the cavity length dominated by the AuNPs semidiameter in average. As the voltages applied onto both the microribbons respectively reaching threshold, the strongly-confined hot electrons in the well-designed ZnO:Ga-AuNPs-ZnO:Ga structure allow the spasing action to be realized, which are plasmonically amplified by AuNPs plasmons. Our results provide an instructive guidance to the realization of plasmonic laser devices upon electrical excitation in future.
Published Version
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