Structuring Nonlinear Wavefront Emitted from Monolayer Transition-Metal Dichalcogenides

Authors

Xuanmiao Hong, Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan, China
Guangwei Hu, CUNY Advanced Science Research CenterFollow
Wenchao Zhao, Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan, China
Kai Wang, Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan, ChinaFollow
Shang Sun, Department of Electrical and Computer Engineering, National University of Singapore, Singapore
Rui Zhu, Department of Electrical and Computer Engineering, National University of Singapore, Singapore
Jing Wu, Institute of Materials Research and Engineering, Agency for Science, Technology and Research, Innovis, Singapore
Weiwei Liu, Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan, China
Kian Ping Loh, Department of Chemistry, National University of Singapore, Singapore
Andrew Thye Shen Wee, Department of Physics, National University of Singapore, Singapore
Bing Wang, Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan, China
Andrea Alù, CUNY Advanced Science Research CenterFollow
Cheng-Wei Qiu, Department of Electrical and Computer Engineering, National University of Singapore, SingaporeFollow
Peixiang Lu, Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan, ChinaFollow

Document Type

Article

Publication Date

9-22-2020

Abstract

The growing demand for tailored nonlinearity calls for a structure with unusual phase discontinuity that allows the realization of nonlinear optical chirality, holographic imaging, and nonlinear wavefront control. Transition-metal dichalcogenide (TMDC) monolayers offer giant optical nonlinearity within a few-angstrom thickness, but limitations in optical absorption and domain size impose restriction on wavefront control of nonlinear emissions using classical light sources. In contrast, noble metal-based plasmonic nanosieves support giant field enhancements and precise nonlinear phase control, with hundred-nanometer pixellevel resolution; however, they suffer from intrinsically weak nonlinear susceptibility. Here, we report a multifunctional nonlinear interface by integrating TMDC monolayers with plasmonic nanosieves, yielding drastically different nonlinear functionalities that cannot be accessed by either constituent. Such a hybrid nonlinear interface allows second-harmonic (SH) orbital angular momentum (OAM) generation, beam steering, versatile polarization control, and holograms, with an effective SH nonlinearity χ⁽²⁾ of ~25 nm/V. This designer platform synergizes the TMDC monolayer and plasmonic nanosieves to empower tunable geometric phases and large field enhancement, paving the way toward multifunctional and ultracompact nonlinear optical devices.

Comments

This article was originally published in Research, available at https://doi.org/10.34133/2020/8757403

This work is distributed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).