Molybdenum disulfide, MoS2, is a next-generation semiconductor and is
frequently integrated into emergent optoelectronic technologies based on
two-dimensional materials. Here, we present a method that provides direct
optical feedback on the thickness and crystallinity of sputter-deposited
MoS2 down to the few-layer regime. This smart sensing enables tracking the
material's functional properties, such as excitonic response, sheet resistance,
and hardness across the amorphous-crystalline transition. To illustrate the
potential of such feedback-controlled fabrication, we realized MoS2-based
hyperbolic metamaterials (HMM) with controllable optical topological
transitions and hardness.Comment: 17 pages, 4 figures, 68 references. Supplementary available with 16
pages, 8 figures, and 10 reference