Skip to main content
Second-Harmonic Optical Vortex Conversion from WS₂ Monolayer
Scientific Reports
  • Arindam Dasgupta
  • Jie Gao, Missouri University of Science and Technology
  • Xiaodong Yang, Missouri University of Science and Technology

Wavelength, polarization and orbital angular momentum of light are important degrees of freedom for processing and encoding information in optical communication. Over the years, the generation and conversion of orbital angular momentum in nonlinear optical media has found many novel applications in the context of optical communication and quantum information processing. With that hindsight, here orbital angular momentum conversion of optical vortices through second-harmonic generation from only one atomically thin WS2 monolayer is demonstrated at room temperature. Moreover, it is shown that the valley-contrasting physics associated with the nonlinear optical selection rule in WS2 monolayer precisely determines the output circular polarization state of the generated second-harmonic vortex. These results pave the way for building future miniaturized valleytronic devices with atomic-scale thickness for many applications such as chiral photon emission, nonlinear beam generation, optoelectronics, and quantum computing.

Mechanical and Aerospace Engineering
Research Center/Lab(s)
Intelligent Systems Center
Keywords and Phrases
  • Article,
  • Chirality,
  • Photon,
  • Physics,
  • Polarization,
  • Room Temperature,
  • Thickness
Document Type
Article - Journal
Document Version
Final Version
File Type
© 2019 The Author(s), All rights reserved.
Creative Commons Licensing
Creative Commons Attribution 4.0
Publication Date
Citation Information
Arindam Dasgupta, Jie Gao and Xiaodong Yang. "Second-Harmonic Optical Vortex Conversion from WS₂ Monolayer" Scientific Reports Vol. 9 Iss. 1 (2019) ISSN: 2045-2322
Available at: