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We study the optical properties of an anisotropic ripple-shaped two-dimensional molybdenum disulfide (MoS2) nanosheet deposited by chemical vapor deposition onto a nanopatterned silica (SiO2) substrate. We unveil a giant anisotropic optical response in the linear and nonlinear regime by a combination of optical extinction measurements, ultrafast broadband transient absorption experiments, and finite element method numerical simulations. In steady state optical measurements, such anisotropy appears as a polarization-dependent extinction in correspondence with the characteristic excitonic peaks (A, B, C, and D) of MoS2. Along with spectral changes, ultrafast measurements strikingly exhibit the onset of an anisotropic relaxation dynamic in the region of the C exciton. Numerical simulations indicate that the observed polarization-dependent optical response is dictated by the nanopattering of MoS2, with …
American Chemical Society
Publication date: 
10 Jun 2018

Andrea Camellini, Carlo Mennucci, Eugenio Cinquanta, Christian Martella, Andrea Mazzanti, Alessio Lamperti, Alessandro Molle, Francesco Buatier De Mongeot, Giuseppe Della Valle, Margherita Zavelani-Rossi

Biblio References: 
Volume: 5 Issue: 8 Pages: 3363-3371
ACS Photonics