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Structuring Nonlinear Wavefront Emitted from Monolayer Transition-Metal Dichalcogenides.

Xuanmiao Hong¹, Guangwei Hu^2,3, Wenchao Zhao¹

¹Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.

Research (Washington, D.C.)

|April 25, 2020

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Researchers developed a hybrid nonlinear interface combining transition-metal dichalcogenide (TMDC) monolayers and plasmonic nanosieves. This novel structure enables advanced nonlinear optical functionalities like OAM generation and holographic imaging with enhanced performance.

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Area of Science:

* Nonlinear optics and photonics.
* Materials science and nanotechnology.

Background:

* Tailored optical nonlinearity is crucial for applications like chiral optics, holography, and wavefront control.
* Transition-metal dichalcogenide (TMDC) monolayers offer strong optical nonlinearity but have limitations in absorption and domain size.
* Plasmonic nanosieves provide field enhancement and precise phase control but have weak nonlinear susceptibility.

Purpose of the Study:

* To create a multifunctional nonlinear interface by integrating TMDC monolayers with plasmonic nanosieves.
* To overcome the limitations of individual components and achieve novel nonlinear optical functionalities.
* To demonstrate enhanced nonlinear optical performance through synergistic effects.

Main Methods:

* Fabrication of a hybrid interface by combining TMDC monolayers with plasmonic nanosieves.
* Characterization of the nonlinear optical properties of the hybrid structure.
* Demonstration of key nonlinear optical phenomena enabled by the integrated platform.

Main Results:

* Achieved a hybrid nonlinear interface with an effective second-harmonic (SH) nonlinearity of ~25 nm/V.
* Demonstrated SH orbital angular momentum (OAM) generation, beam steering, and versatile polarization control.
* Successfully generated holograms using the integrated nonlinear platform.
* Synergistic effects of TMDC and plasmonic nanosieves enabled tunable geometric phases and large field enhancement.

Conclusions:

* The developed hybrid nonlinear interface offers unique functionalities unattainable by individual components.
* This platform paves the way for multifunctional and ultracompact nonlinear optical devices.
* The synergistic integration of TMDC monolayers and plasmonic nanosieves represents a significant advancement in nonlinear optics.