Abstract：
: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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Dasgupta A,Gao J,Yang Xdoi
10.1038/s41598-019-45424-4subject
Has Abstractpub_date
2019-06-19 00:00:00pages
8780issue
1issn
2045-2322pii
10.1038/s41598-019-45424-4journal_volume
9pub_type
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