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Jia, Pengxue; Shi, Hongyan; Niu, Yanfei; Xu, Chen; Sun, Xiudong
Plasmonics (Norwell, Mass.), 04/2022, Letnik: 17, Številka: 2Journal Article
In this work, we present a plasmonic platform capable of the enhanced electric field (E-field) intensity, tunable LSPR effect, and trapping nanoparticles in different configurations of Ag triangular nanoplates. Our nanostructures equip the higher structural anisotropy (larger aspect ratio, 10:1), which localize surface plasmons in the gap region and possess the great factor of E-field enhancement (~850). Tunable near-field enhanced hotspots of Ag nanoplates support different resonant modes from 350 to 1200 nm, and the distribution of electric field and trapping potential well can also be manipulated. The hotspots for dimer enhance the optical force (~3.2 nN) on 30-nm polystyrene nanoparticles with a power density as low as 1 mW/μm 2 , which shows brilliant trapping characteristics. The tetramer with higher periodic symmetry provides a deep potential well (~ 1.3 × 10 3 k B T). It offers opportunities for the trapping and manipulating particles of nanoscale. And the nanogap structures pave a way for applications in surface-enhanced Raman scattering, surface-enhanced infrared absorption tunable biosensors.
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