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Title: Second-harmonic generation of embedded plasmonic nanoparticle arrays via interparticle coupling
Authors: Chu, Lingrui
Li, Ziqi
Zhu, Han
Ren, Feng
Chen, Feng
Keywords: Science::Physics
Issue Date: 2022
Source: Chu, L., Li, Z., Zhu, H., Ren, F. & Chen, F. (2022). Second-harmonic generation of embedded plasmonic nanoparticle arrays via interparticle coupling. Applied Physics Letters, 120(7), 073104-.
Journal: Applied Physics Letters
Abstract: Efficient nonlinear frequency conversion, such as second-harmonic generation in ultracompact structures, is essential for the development of modern nanophotonic devices. Here, we demonstrate intense second-harmonic emission in scalable embedded Ag nanoparticle arrays fabricated by ion implantation into BK7 glass. The interparticle coupling effect significantly enhances the local field at the nanogap (gap size ∼1 nm) of two neighboring Ag nanoparticles and finally amplifies second-harmonic emission generated at the surface of plasmonic nanoparticles. Notably, the intensity of second-harmonic emission in embedded Ag nanoparticle arrays is comparable to that of two-dimensional transition metal dichalcogenides under the excitation of a fundamental wave at 1064 nm and independent of the incident polarization angles. Our work offers a promising strategy on the rapid fabrication of low-cost nonlinear optical nanostructures with great environmental stability.
ISSN: 0003-6951
DOI: 10.1063/5.0077592
Schools: School of Physical and Mathematical Sciences 
Rights: © 2022 Author(s). All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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