Broadband Optical Constants and Nonlinear Properties of SnS 2 and SnSe 2

SnS and SnSe have recently been shown to have a wide range of applications in photonic and optoelectronic devices. However, because of incomplete knowledge about their optical characteristics, the use of SnS and SnSe in optical engineering remains challenging. Here, we addressed this problem by establishing SnS and SnSe linear and nonlinear optical properties in the broad (300-3300 nm) spectral range. Coupled with the first-principle calculations, our experimental study unveiled the full dielectric tensor of SnS and SnSe . Furthermore, we established that SnS is a promising material for visible high refractive index nanophotonics. Meanwhile, SnSe demonstrates a stronger nonlinear response compared with SnS . Our results create a solid ground for current and next-generation SnS - and SnSe -based devices.