Investigation of the nonlinear optical frequency conversion in ultrathin franckeite heterostructures
Tipo
Artigo
Data de publicação
2024
Periódico
Journal of Applied Physics
Citações (Scopus)
1
Autores
Cadore A.R.
Ore A.S.M.V.
Steinberg D.
Zapata J.D.
de Souza E.A.T.
Bahamon D.A.
de Matos C.J.S.
Ore A.S.M.V.
Steinberg D.
Zapata J.D.
de Souza E.A.T.
Bahamon D.A.
de Matos C.J.S.
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© 2024 Author(s).Layered franckeite is a natural superlattice composed of two alternating layers of different compositions, SnS 2 - and PbS-like. This creates incommensurability between the two species along the planes of the layers, resulting in spontaneous symmetry-break periodic ripples in the a-axis orientation. Nevertheless, natural franckeite heterostructure has shown potential for optoelectronic applications mostly because it is a semiconductor with 0.7 eV bandgap, air-stable, and can be easily exfoliated down to ultrathin thicknesses. Here, we demonstrate that few-layer franckeite shows a highly anisotropic nonlinear optical response due to its lattice structure, which allows for the identification of the ripple axis. Moreover, we find that the highly anisotropic third-harmonic emission strongly varies with material thickness. These features are further corroborated by a theoretical nonlinear susceptibility model and the nonlinear transfer matrix method. Overall, our findings help to understand this material and propose a characterization method that could be used in other layered materials and heterostructures to assign their characteristic axes.
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Assuntos Scopus
A: semiconductors , Air stable , Alternating layers , Axis orientation , Natural superlattices , Nonlinear-optical frequency conversion , Optoelectronic applications , Periodic ripples , Spontaneous symmetry , Ultra-thin