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Enhanced Optical Forces and Tunable LSPR of Ag Triangular Nanoplates for Plasmonic Tweezers

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Abstract

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/μm2, which shows brilliant trapping characteristics. The tetramer with higher periodic symmetry provides a deep potential well (~\(1.3 \times {10^3}\) kBT). 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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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This study was financially supported by the National Natural Science Foundation of China (No. 91950117 and No. 21973023).

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Authors and Affiliations

  1. Institute of Modern Optics, School of Physics, Harbin Institute of Technology, Harbin, 150001, China

    Pengxue Jia, Hongyan Shi, Yanfei Niu, Chen Xu & Xiudong Sun

  2. Key Laboratory of Micro-Nano Optoelectronic Information System of Ministry of Industry and Information Technology, Harbin, 150001, China

    Pengxue Jia, Hongyan Shi, Yanfei Niu, Chen Xu & Xiudong Sun

  3. Key Laboratory of Micro-Optics and Photonic Technology of Heilongjiang Province, Harbin Institute of Technology, Harbin, 150001, China

    Pengxue Jia, Hongyan Shi, Yanfei Niu, Chen Xu & Xiudong Sun

  4. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi, 030006, People’s Republic of China

    Hongyan Shi & Xiudong Sun

Authors
  1. Pengxue Jia
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  2. Hongyan Shi
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  3. Yanfei Niu
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  4. Chen Xu
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  5. Xiudong Sun
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Contributions

Pengxue Jia contributed to analysis and manuscript preparation. All the authors discussed and reviewed the results. Numerical simulations were performed by Pengxue Jia, Yanfei Niu, and Chen Xu. The conception of the study was proposed by Xiudong Sun and Hongyan Shi. All the authors read and approved the final manuscript.

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Correspondence to Xiudong Sun.

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Pengxue Jia and Hongyan Shi contributed equally to this work and should be considered co-first authors

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Jia, P., Shi, H., Niu, Y. et al. Enhanced Optical Forces and Tunable LSPR of Ag Triangular Nanoplates for Plasmonic Tweezers. Plasmonics 17, 551–558 (2022). https://doi.org/10.1007/s11468-021-01533-3

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  • DOI: https://doi.org/10.1007/s11468-021-01533-3

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