Strong coupling of monolayer molybdenum disulfide with silicon nanogrooves

Encryption technology is an indispensable strategy to conduct information warfare. As the traditional encryption method is easily to be deciphered, it is necessary to develop an unbreakable encrypted communication. Polarization state encryption comes into being to resist the harm of quantum hackers. Monolayer Molybdenum disulfide is expected to become a mainstream material for next-generation optoelectronic sensing due to its fascinating physical properties. However, the low quantum efficiency, weak light absorption, and low photoluminescence (PL) of monolayer Molybdenum disulfide result in the urgent need to introduce effective routes for manipulating light−matter coupling. All-dielectric nanostructures offer a promising platform for regulating light to complement or even replace conventional plasmonic structures by avoiding substantial heat dissipation. Here, we demonstrate that the PL enhancement of Molybdenum disulfide is enhanced by up to 88 times, which is the best among the reported PL enhancements of all-dielectric nanostructures, and exceeds most of the enhancements of plasmonic structures so far, by strong coupling with Si nanogrooves. Meanwhile, the scattering of the coupled nanostructure exhibits an angle-dependent polarization state, which can be further applied to information encryption. These findings have shown that this strategy can not only efficiently capture light, but also exhibit angle-dependent polarization states, which building an impregnable barrier for future quantum encrypted communications.