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High-Resolution Large-Ensemble Nanoparticle Trapping with Multifunctional Thermoplasmonic Nanohole Metasurface.

  • Ndukaife, Justus C1, 2
  • Xuan, Yi2
  • Nnanna, Agbai George Agwu3
  • Kildishev, Alexander V2
  • Shalaev, Vladimir M2
  • Wereley, Steven T4
  • Boltasseva, Alexandra2
  • 1 Department of Electrical Engineering and Computer Science, and Vanderbilt Institute of Nanoscale Science and Engineering , Vanderbilt University , Nashville , Tennessee 37232 , United States. , (United States)
  • 2 School of Electrical and Computer Engineering and Birck Nanotechnology Center , Purdue University , West Lafayette , Indiana 47907 , United States. , (India)
  • 3 Water Institute , Purdue University Northwest , Hammond , Indiana 46323 , United States. , (India)
  • 4 School of Mechanical Engineering and Birck Nanotechnology Center , Purdue University , West Lafayette , Indiana 47907 , United States. , (India)
Published Article
ACS Nano
American Chemical Society
Publication Date
Jun 07, 2018
DOI: 10.1021/acsnano.8b00318
PMID: 29847087


The intrinsic loss in a plasmonic metasurface is usually considered to be detrimental for device applications. Using plasmonic loss to our advantage, we introduce a thermoplasmonic metasurface that enables high-throughput large-ensemble nanoparticle assembly in a lab-on-a-chip platform. In our work, an array of subwavelength nanoholes in a metal film is used as a plasmonic metasurface that supports the excitation of localized surface plasmon and Bloch surface plasmon polariton waves upon optical illumination and provides a platform for molding both optical and thermal landscapes to achieve a tunable many-particle assembling process. The demonstrated many-particle trapping occurs against gravity in an inverted configuration where the light beam first passes through the nanoparticle suspension before illuminating the thermoplasmonic metasurface, a feat previously thought to be impossible. We also report an extraordinarily enhanced electrothermoplasmonic flow in the region of the thermoplasmonic nanohole metasurface, with comparatively larger transport velocities in comparison to the unpatterned region. This thermoplasmonic metasurface could enable possibilities for myriad applications in molecular analysis, quantum photonics, and self-assembly and creates a versatile platform for exploring nonequilibrium physics.

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