Microcavity enhanced second harmonic generation in 2D MoS_2

Two-dimensional semiconductor materials have shown strong non-linear optical properties at the monolayer limit due to the lack of inversion symmetry. These non-linear materials can ideally be combined with top-down planar fabrication methods to offer new optical devices that can be integrated on-chip as compared to large bulk non-linear crystals. Here, we show enhanced second harmonic generation (SHG) from monolayer MoS2 embedded within an all-dielectric Fabry-Perot microcavity that is resonant at the pump wavelength. Power dependency shows a 10-fold increase in second harmonic generation matching theoretical estimate.