Journal
LASER & PHOTONICS REVIEWS
Volume 16, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202100604
Keywords
excitons; Mie resonances; molybdenum disulfide; second-harmonic generation; transition metal dichalcogenides
Categories
Funding
- Russian Ministry of Education and Science [14.W03.31.0008]
- Russian Science Foundation [21-19-00675, 21-79-00206, 20-12-00371]
- Russian Foundation for Basic Research [21-52-12036]
- MSU Quantum Technology Centre
- Development program of the MSU Interdisciplinary Scientific and Educational School Photonic and Quantum technologies. Digital Medicine
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD [EXC 2122, 390833453]
- BASIS Foundation [19-2-6-28-1]
- Russian Federation
- Russian Science Foundation [21-79-00206, 21-19-00675] Funding Source: Russian Science Foundation
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Recent discoveries have shown that bulk TMDCs have excellent properties for post-silicon photonics, such as high refractive index, giant optical anisotropy, and pronounced excitonic response. However, their inversion symmetry hinders their use in nonlinear-optical processes. By engineering MoS2 nanodisks to couple Mie resonances with C-excitons, researchers have overcome this obstacle and achieved a 23-fold enhancement of SHG intensity. Additionally, the SHG demonstrates a strong anisotropic response typical of a MoS2 monolayer.
Thanks to a high refractive index, giant optical anisotropy, and pronounced excitonic response, bulk transition metal dichalcogenides (TMDCs) have recently been discovered to be an ideal foundation for post-silicon photonics. The inversion symmetry of bulk TMDCs, on the other hand, prevents their use in nonlinear-optical processes such as second-harmonic generation (SHG). To overcome this obstacle and broaden the application scope of TMDCs, MoS2$_2$ nanodisks are engineered to couple Mie resonances with C-excitons. As a result, their alliance produces 23-fold enhancement of SHG intensity with respect to the resonant SHG from a high-quality exfoliated MoS2$_2$ monolayer under C-exciton excitation. Furthermore, SHG demonstrates a strongly anisotropic response typical of a MoS2$_2$ monolayer due to the single-crystal structure of the fabricated nanodisks, providing a polarization degree of freedom to manipulate SHG. Hence, these results significantly improve the potential of bulk TMDCs enabling an avenue for next-generation nonlinear photonics.
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