Abstract
We study the optical properties of Molybdenum Disulphide nanosheets deposited by chemical vapor deposition onto a nanopatterned substrate endowed with a uniaxial corrugation. The uniaxial nanocorrugation leads to a polarization dependence in steady state and an anisotropic relaxation around the C resonance. Finite element numerical simulations allow to better disclose the scenario. Our findings point towards new possibilities for the manipulation of the optical properties of two-dimensional transition metal dichalcogenides via substrate nanopatterning.
Highlights
Nowadays two-dimensional transition metal dichalcogenides (TMDs) constitute one of the most promising class of materials for novel opto-electronic devices due to their peculiar physical properties including strong light-matter interaction and excitonic effects [1]. Their properties can be modified via substrate pattern design by introducing an anisotropic degree of freedom in the spatial arrangement of TMD nanosheets [2, 3]
Our study of the morphology dependent behavior is based on polarization resolved optical extinction and broadband ultrafast pump-probe experiments with 100fs temporal resolution
The experimental evidences, supported by full-wave finite element numerical simulations, show a rich and complex scenario. This is characterized by: (i) a giant optical anisotropy in the spectral region of the four main excitonic resonances (A, B, C, D) with peculiar features dictated by of the out-of-plane component of MoS2 dielectric permittivity, (ii) a polarization dependence of the relaxation dynamics around the C resonance (Fig. 1) where the optical response is dominated by a van Hove singularity in the joint density of states
Summary
Nowadays two-dimensional transition metal dichalcogenides (TMDs) constitute one of the most promising class of materials for novel opto-electronic devices due to their peculiar physical properties including strong light-matter interaction and excitonic effects [1]. Their properties can be modified via substrate pattern design by introducing an anisotropic degree of freedom in the spatial arrangement of TMD nanosheets [2, 3].
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