  Transition metal dichalcogenide, especially MoS2 has attracted lot of
attention recently owing to its tunable visible range band gap and anisotropic
electronic and transport properties. Here, we report a comprehensive inelastic
light scattering measurements on CVD grown (horizontally and vertically aligned
flakes) as well as single crystal flakes of MoS2, probing the anisotropic
optical response via studying the polarization dependence intensity of the
Raman active phonon modes as a function of different incident photon energy and
flake thickness. Our polarization dependent Raman studies intriguingly revealed
strong anisotropic behavior reflected in the anomalous renormalization of the
modes intensity as a function of flake thickness, phonons and photon energy.
Our observations reflects the strong anisotropic light-matter interaction in
this high crystalline symmetric layered MoS2 system especially for the in-plane
vibrations, which is crucial for understanding as well application of these
materials for future application such as optoelectronic applications.
