High-order harmonics generation in MoS2 nanosheets in the presence of CdSe and CdSe/V2O5 quantum dots
Abstract
Engineering nonlinear optical responses in two-dimensional materials via heterostructure design is emerging as a powerful approach for next-generation photonic devices. Although perturbative nonlinear effects in these systems are well studied, their connection to nonperturbative processes such as high-harmonic generation (HHG) remains largely unexplored. Here, we investigate the HHG from few-layer MoS2 nanosheets integrated with CdSe and passivated CdSe/V2O5 quantum dots (QDs). The hybrid structures exhibit pronounced enhancement in harmonic intensity and a clear extension of the harmonic cutoff relative to pristine MoS2. We demonstrate that interfacial charge-transfer dynamics—previously associated with the dominant contribution to the third-order susceptibility χ(3)—also govern the efficiency of HHG, thereby establishing a direct link between perturbative and nonperturbative regimes in these 0D–2D hybrids. The carrier injection from the QDs increases the electron–hole population participating in HHG, while the moderated response in passivated QD systems highlights the role of interfacial potential barriers. These results provide a unified physical picture of nonlinear optical processes in hybrid nanostructures and offer design principles for enhancing coherent light generation.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (11)
Srinivasa Rao Konda
The GPL Photonics Laboratory, State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences 1 , Changchun, Jilin 130033,
Puspendu Barik
The GPL Photonics Laboratory, State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences 1 , Changchun, Jilin 130033,
Sushma Kumari
Department of Physics, Indian Institute of Technology Ropar 2 , Rupnagar 140001, Punjab,
Subhash Singh
The Institute of Optics, University of Rochester 4 , Rochester, New York 14627,
Venkatesh Mottamchetty
The GPL Photonics Laboratory, State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences 1 , Changchun, Jilin 130033,
Amit Srivasthava
Department of Physics, TDPG College, VBS Purvanchal University 6 , Jaunpur 222001,
Vyacheslav V. Kim
Institute for Advanced Studies, New Uzbekistan University 7 , Movarounnahr 1, Tashkent 100007,
Rashid A. Ganeev
Institute for Advanced Studies, New Uzbekistan University 7 , Movarounnahr 1, Tashkent 100007,
Venugopal Rao Soma
School of Physics & DRDO Industry Academia – Centre of Excellence (DIA-CoE, formerly ACRHEM), University of Hyderabad 4 , Hyderabad 500046, Telangana,
Chunlei Guo
Wei Li