Spatially-Controllable Hot Spots for Plasmon-Enhanced Second-Harmonic Generation in AgNP-ZnO Nanocavity Arrays

Plasmon-enhanced second-harmonic generation (PESHG) based on hybrid metal-dielectric nanostructures have extraordinary importance for developing efficient nanoscale nonlinear sources, which pave the way for new applications in photonic circuitry, quantum optics, and biosensors. However, the relative...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2018-12, Vol.8 (12), p.1012
Main Authors: Shen, Shaoxin, Gao, Min, Ban, Rongcheng, Chen, Huiyu, Wang, Xiangjie, Qian, Lihua, Li, Jing, Yang, Zhilin
Format: Article
Language:English
Subjects:
Annealing
Arrays
Biosensors
Circuits
Electromagnetic fields
Emulsion polymerization
finite-difference time-domain
hybrid nanostructure
Hybrid systems
Lasers
Nanoparticles
Optics
Photonics
Physics
Plasma etching
plasmonics
Quantum optics
Second harmonic generation
Silver
Spectrum analysis
Spheres
Zinc oxide
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Summary:Plasmon-enhanced second-harmonic generation (PESHG) based on hybrid metal-dielectric nanostructures have extraordinary importance for developing efficient nanoscale nonlinear sources, which pave the way for new applications in photonic circuitry, quantum optics, and biosensors. However, the relatively high loss of excitation energies and the low spatial overlapping between the locally enhanced electromagnetic field and nonlinear materials still limit the promotion of nonlinear conversion performances in such hybrid systems. Here, we design and fabricate an array of silver nanoparticle-ZnO (AgNP-ZnO) nanocavities to serve as an efficient PESHG platform. The geometry of AgNP-ZnO nanocavity arrays provides a way to flexibly modulate hot spots in three-dimensional space, and to achieve a good mutual overlap of hot spots and ZnO material layers for realizing efficient SH photon generation originating from ZnO nanocavities. Compared to bare ZnO nanocavity arrays, the resulting hybrid AgNP-ZnO design of nanocavities reaches the maximum PESHG enhancement by a factor of approximately 31. Validated by simulations, we can further interpret the relative contribution of fundamental and harmonic modes to Ag-NP dependent PESHG performances, and reveal that the enhancement stems from the co-cooperation effect of plasmon-resonant enhancements both for fundamental and harmonic frequencies. Our findings offer a previously unreported method for designing efficient PESHG systems and pave a way for further understanding of a surface plasmon-coupled second-order emission mechanism for the enhancement of hybrid systems.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano8121012