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

被引：46

作者：

Yao, Kaiyuan ^{[1
,2
]}

Yanev, Emanuil ^{[1
]}

Chuang, Hsun-Jen ^{[4
]}

Rosenberger, Matthew R. ^{[4
]}

Xu, Xinyi ^{[1
]}

Darlington, Thomas ^{[1
,3
]}

McCreary, Kathleen M. ^{[4
]}

Hanbicki, Aubrey T. ^{[4
,5
]}

Watanabe, Kenji ^{[6
]}

Taniguchi, Takashi ^{[6
]}

Jonker, Berend T. ^{[4
]}

Zhu, Xiaoyang ^{[7
]}

Basov, D. N. ^{[8
]}

Hone, James C. ^{[1
]}

Schuck, P. James ^{[1
]}

机构：

[1] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA

[2] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[4] Naval Res Lab, Mat Sci & Technol Div, Washington, DC 20375 USA

[5] Lab Phys Sci, College Pk, MD 20740 USA

[6] Natl Inst Mat Sci, Tsukuba, Ibaraki, Japan

[7] Columbia Univ, Dept Chem, New York, NY 10027 USA

[8] Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA

来源：

ACS NANO | 2020年 / 14卷 / 01期

关键词：

nonlinear optics; sum frequency generation; exciton; two-dimensional semiconductors; van der Waals heterostructures; confocal microscopy; valleytronics; BANDGAP RENORMALIZATION; 2ND-HARMONIC GENERATION; MOS2;

D O I：

10.1021/acsnano.9b07555

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：708 / 714

页数：7

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