journal article·2020-01-28Open access

Continuous Wave Sum Frequency Generation and Imaging of Monolayer and Heterobilayer Two-Dimensional Semiconductors

Kaiyuan Yao, Emanuil Yanev, Hsun-Jen Chuang, Matthew R. Rosenberger, Xinyi Xu, Thomas Darlington, Kathleen M. McCreary, Aubrey T. Hanbicki, Kenji Watanabe, Takashi Taniguchi, Berend T. Jonker, Xiaoyang Zhu, D. N. Basov, James C. Hone, P. James Schuck

ACS Nano· Volume 14· Issue 1

Abstract

We report continuous-wave second harmonic and sum frequency generation from two-dimensional transition metal dichalcogenide monolayers and their heterostructures with pump irradiances several orders of magnitude lower than those of conventional pulsed experiments. The high nonlinear efficiency originates from above-gap excitons in the band nesting regions, as revealed by wavelength-dependent second order optical susceptibilities quantified in four common monolayer transition metal dichalcogenides. Using sum frequency excitation spectroscopy and imaging, we identify and distinguish one- and two-photon resonances in both monolayers and heterobilayers. Data for heterostructures reveal responses from constituent layers accompanied by nonlinear signal correlated with interlayer transitions. We demonstrate spatial mapping of heterogeneous interlayer coupling by sum frequency and second harmonic confocal microscopy on heterobilayer MoSe2/WSe2.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States

Department of Mechanical Engineering, University of California, Berkeley, Berkeley, California 94720, United States

Materials Science & Technology Division, Naval Research Laboratory, Washington, D.C. 20375, United States

Department of Physics, University of California, Berkeley, Berkeley, California 94720, United States

Laboratory for Physical Sciences, College Park, Maryland 20740, United States

National Institute for Materials Science, Tsukuba 305-0047, Japan

Department of Chemistry, Columbia University, New York, New York 10027, United States

Department of Physics, Columbia University, New York, New York 10027, United States

Funding

Basic Energy Sciences · U.S. Naval Research Laboratory

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