Structuring Nonlinear Wavefront Emitted from Monolayer Transition-Metal Dichalcogenides
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 pixel-level 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 01, 2020
- Source ID
- 10.34133/2020/9085782
Entities
People
- Andrea Alù
- Andrew Wee
- Bing Wang
- Chengwei W. Qiu
- Guangwei Hu
- Jing Wu
- Kai Wang
- Kian Ping Loh
- Peixiang Lu
- Rui Zhu
- Shang Sun
- Weiwei Liu
- Wenchao Zhao
- Xuanmiao Hong
Organizations
- Air Force Office of Scientific Research
- Centre for Advanced 2D Materials
- City University of New York
- Defense Advanced Research Projects Agency
- Huazhong University of Science and Technology
- Institute of Materials Research and Engineering
- National Natural Science Foundation of China
- National Research Foundation
- Wuhan Institute of Technology
- Yusuf Hamied Department of Chemistry