All-optical nonreciprocity due to valley polarization pumping in transition metal dichalcogenides

Sriram Guddala, Yuma Kawaguchi, Filipp Komissarenko, Svetlana Kiriushechkina, Anton Vakulenko, Kai Chen, Andrea Alù, Vinod M. Menon and Alexander B. Khanikaev ()
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Sriram Guddala: City College of the City University of New York
Yuma Kawaguchi: City College of the City University of New York
Filipp Komissarenko: City College of the City University of New York
Svetlana Kiriushechkina: City College of the City University of New York
Anton Vakulenko: City College of the City University of New York
Kai Chen: City College of the City University of New York
Andrea Alù: City College of the City University of New York
Vinod M. Menon: Graduate Center of the City University of New York
Alexander B. Khanikaev: City College of the City University of New York

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Nonreciprocity and nonreciprocal optical devices play a vital role in modern photonic technologies by enforcing one-way propagation of light. Here, we demonstrate an all-optical approach to nonreciprocity based on valley-selective response in transition metal dichalcogenides (TMDs). This approach overcomes the limitations of magnetic materials and it does not require an external magnetic field. We provide experimental evidence of photoinduced nonreciprocity in a monolayer WS2 pumped by circularly polarized (CP) light. Nonreciprocity stems from valley-selective exciton population, giving rise to nonlinear circular dichroism controlled by CP pump fields. Our experimental results reveal a significant effect even at room temperature, despite considerable intervalley-scattering, showing promising potential for practical applications in magnetic-free nonreciprocal platforms. As an example, here we propose a device scheme to realize an optical isolator based on a pass-through silicon nitride (SiN) ring resonator integrating the optically biased TMD monolayer.

Date: 2021
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DOI: 10.1038/s41467-021-24138-0

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