Journal
ACS NANO
Volume 15, Issue 1, Pages 1291-1300Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c08498
Keywords
metal-dielectric-metal structure; plasmonics; second-harmonic generation; polarization; nonlinear optical devices
Categories
Funding
- Ministry of Science and Technology [2017YFA0205700, 2017YFA0304600, 2017YFA0205004, 2016YFA0200700]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB36000000]
- National Natural Science Foundation of China [51971070, 10974037, 21673054, 11874130, 22073022, 12074086, 61774003, 61521004, 52072006]
- National Key R&D Program of China [2018YFA0703700]
- National Key Research and Development Program of China [2016YFA0200403]
- CAS Strategy Pilot Program [XDA 09020300]
- Eu-FP7 Project [247644]
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We have developed an efficient inch-scale SHG source through a solution-processed method by assembling gold nanoparticles with porous anodic alumina templates. Our device achieves multiresonance in both visible and near-infrared regions, providing strong electric field enhancement at the gap region. The SHG radiation produced is polarization-independent and shows wide-angle nonlinear response thanks to the unique geometry of the nanostructure.
Second-harmonic generation (SHG) in plasmonic nanostructures has been investigated for decades due to their wide applications in photonic circuit, quantum optics and biosensing. Development of large-scale, uniform, and efficient plasmonic nanostructure system with tunable modes is desirable for their feasible utilizations. Herein, we design an efficient inch-scale SHG source by a solution-processed method instead of traditional high-cost processes. By assembling the gold nanoparticles with the porous anodic alumina templates, multiresonance in both visible and near-infrared regions can be achieved in hexagonal plasmonic nanostructure arrays, which provide strong electric field enhancement at the gap region. Polarization-independence SHG radiation has been realized owing to the in-plane isotropic characteristic of assembled unit. The tilt-angle dependent and angle-resolved measurement showed that wide-angle nonlinear response is achieved in our device because of the gap geometry of ball-in-bowl nanostructure with nonlinear emission electric dipoles distributed on the concave surface, which makes it competitive in practical applications. Our progress not only makes it possible to produce uniform inch-scale nonlinear arrays through low-cost solution process; and also advances the understanding of the SHG radiation in plasmonic nanostructures.
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