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Title: Plasmonic hot carriers-controlled second harmonic generation in WSe2 bilayers
Authors: Wen, Xinglin
Xu, Weigao
Zhao, Weijie
Khurgin, Jacob B.
Xiong, Qihua
Keywords: Science::Physics
Issue Date: 2018
Source: Wen, X., Xu, W., Zhao, W., Khurgin, J. B., & Xiong, Q. (2018). Plasmonic hot carriers-controlled second harmonic generation in WSe2 bilayers. Nano Letters, 18(3), 1686-1692. doi:10.1021/acs.nanolett.7b04707
Journal: Nano Letters
Abstract: Modulating second harmonic generation (SHG) by a static electric field through either electric-field-induced SHG or charge-induced SHG has been well documented. Nonetheless, it is essential to develop the ability to dynamically control and manipulate the nonlinear properties, preferably at high speed. Plasmonic hot carriers can be resonantly excited in metal nanoparticles and then injected into semiconductors within 10–100 fs, where they eventually decay on a comparable time scale. This allows one to rapidly manipulate all kinds of characteristics of semiconductors, including their nonlinear properties. Here we demonstrate that plasmonically generated hot electrons can be injected from plasmonic nanostructure into bilayer (2L) tungsten diselenide (WSe2), breaking the material inversion symmetry and thus inducing an SHG. With a set of pump–probe experiments we confirm that it is the dynamic separation electric field resulting from the hot carrier injection (rather than a simple optical field enhancement) that is the cause of SHG. Transient absorption measurement further substantiate the plasmonic hot electrons injection and allow us to measure a rise time of ∼120 fs and a fall time of 1.9 ps. Our study creates opportunity for the ultrafast all-optical control of SHG in an all-optical manner that may enable a variety of applications.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.7b04707
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Organisations: NOVITAS, Nanoelectronics Centre of Excellence
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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