Fig. 1: Third harmonic generation in the ultra-violet spectral range of As2S3.
From: Near-infrared to ultra-violet frequency conversion in chalcogenide metasurfaces
An arsenic trisulfide nanowire-based metasurface on a silica substrate, enabling the desired enhancement of third harmonic generation. The As2S3 on SiO2 400 μm × 400 μm metasurface with a period p = 625 nm, nanowire width wx = 430 nm and height h = 300 nm is pumped by the near-infrared 100 fs pulses from a tunable ultrafast laser system consisting of a 1 kHz Ti:sapphire laser and an optical parametric amplifiers (OPA), polarized along x-direction.
