Abstract
SnS2 and SnSe2 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 SnS2 and SnSe2 in optical engineering remains challenging. Here, we addressed this problem by establishing SnS2 and SnSe2 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 SnS2 and SnSe2. Furthermore, we established that SnS2 is a promising material for visible high refractive index nanophotonics. Meanwhile, SnSe2 demonstrates a stronger nonlinear response compared with SnS2. Our results create a solid ground for current and next-generation SnS2- and SnSe2-based devices.
Highlights
Van der Waals materials have emerged as a promising building block for next-generation optical and electronic devices [1,2,3,4,5,6,7,8]
Our results revealed that SnS2 is a high2 refractive2index material, which fills the important gap in the visible that SnS2 is a high refractive index material, which fills the important gap in the visible spectrum between bandgap energies of GaP and TiO2, which makes SnS2 a promising spectrum between bandgap energies of GaP and TiO2, which makes SnS2 a promising material for all-dielectric nanophotonics
E0 r2 f τcn2ω n2ω λ2 sin c where χ(2) is a nonlinear optical susceptibility, S = 0.94 is the shape factor for Gaussian pulses, e0 is the permittivity of vacuum, c is the speed of light, f = 80 MHz is the pulse repetition rate, τ = 150 fs is the pulse duration, r = 25 μm is the focal spot radius, L is a sample thickness, λ is a pump wavelength, ∆k is the wavevectors mismatch of the pump and SH
Summary
Van der Waals materials have emerged as a promising building block for next-generation optical and electronic devices [1,2,3,4,5,6,7,8]. The number of known layered materials has increased exponentially over the last decade, with more than 1000 layered compounds being isolated and identified [23] As a result, their properties are largely unexplored, which considerably impedes their application. Broadband linear and nonlinear optical properties are highly desired for the acceleration of the development of SnS2 and SnSe2based devices.properties are highly desired for the acceleration of the development of SnS2 and SnSe2 -based.
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