In-fibre second-harmonic generation with embedded two-dimensional materials

Abstract Silica-based optical fibres are a workhorse of nonlinear optics, providing ready access to range phenomena including solitons and self-phase modulation. However, they have one fundamental limitation: due the amorphous nature silica, do not exhibit second-order nonlinearity, except for negligible contributions from surfaces. Here we demonstrate second-harmonic generation in functionalized by using monolayer highly MoS 2 directly grown on fibre’s core. The -functionalized fibre exhibits susceptibility ( ? (2) ) value 44 pm V –1 conversion efficiency 0.2 × 10 –3 m ?2 W ?1 . This approach is scalable can be generalized other transition metal dichalcogenides wide waveguide systems. Our results new towards efficient in-fibre sources may establish platform -based optoelectronics, photonics platforms, integrated architectures active networks.