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Exploring new nanowaveguide materials and structures is of great scientific interest and technological significance for optical and photonic applications. In this work, high-quality single-crystal MoO 3  nanoribbons (NRs) are synthesized and used for optical guiding. External light sources are efficiently launched into the single MoO 3  NRs using silica fiber tapers. It is found that single MoO 3  NRs are as good nanowaveguides with loss optical losses (typically less than 0.1 dB/μm) and broadband optical guiding in the visible/near-infrared region. Single MoO 3  NRs have good Raman gains that are comparable to those of semiconductor nanowaveguides, but the second harmonic generation efficiencies are about 4 orders less than those of semiconductor nanowaveguides. And also no any third-order nonlinear optical effects are observed at high pump power. A hybrid Fabry-Pérot cavity containing an active CdSe nanowire and a passive MoO 3  NR is also demonstrated, and the ability of coupling light from other active nanostructures and fluorescent liquid solutions has been further demonstrated. These optical properties make single MoO 3  NRs attractive building blocks as elements and interconnects in miniaturized photonic circuitries and devices.

Single MoO3 nanoribbon waveguides: good building blocks as elements and interconnects for nanophotonic applications