2 research outputs found

    Ultrafast Anisotropic Exciton Dynamics in Nanopatterned MoS<sub>2</sub> Sheets

    No full text
    We study the optical properties of an anisotropic ripple-shaped two-dimensional molybdenum disulfide (MoS<sub>2</sub>) nanosheet deposited by chemical vapor deposition onto a nanopatterned silica (SiO<sub>2</sub>) 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 MoS<sub>2</sub>. 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 MoS<sub>2</sub>, with peculiar features belonging to the out-of-plane component of the dielectric tensor of MoS<sub>2</sub> that is made effective through the rippled configuration. Our findings give a rationale to the anisotropic exciton response and show that morphology manipulation represents a valuable option for the tuning of optical and electronic properties in transition-metal dichalcogenides

    Data for "Resonant Fully dielectric metasurfaces for ultrafast Terahertz pulse generation"

    No full text
    Dataset to accompany the paper"Resonant Fully dielectric metasurfaces for ultrafast Terahertz pulse generation."The dataset is provided in a .mat format,. Separated into folders for each metasurface denoted in the paper. Then each file is labelled by by input wavelength of the laser. Each metasurface also has a power folder as measured by the opo. Each file is broken into two sets, the reading of the lock-in amplifier and the time axis.Inside the theoretical modelling folder is the .mat data for the theoretical modelling, separated by metasurface and then inside the file separated by energy, thz frequency and wavelength.</p
    corecore