2 research outputs found
Ultrafast Anisotropic Exciton Dynamics in Nanopatterned MoS<sub>2</sub> Sheets
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"
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