Low-Power Optical Trapping of Nanoparticles and Proteins with Resonant Coaxial Nanoaperture Using 10 nm Gap

Daehan Yoo, Kargal L. Gurunatha, Han Kyu Choi, Daniel A. Mohr, Christopher T. Ertsgaard, Reuven Gordon, Sang Hyun Oh

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

We present optical trapping with a 10 nm gap resonant coaxial nanoaperture in a gold film. Large arrays of 600 resonant plasmonic coaxial nanoaperture traps are produced on a single chip via atomic layer lithography with each aperture tuned to match a 785 nm laser source. We show that these single coaxial apertures can act as efficient nanotweezers with a sharp potential well, capable of trapping 30 nm polystyrene nanoparticles and streptavidin molecules with a laser power as low as 4.7 mW. Furthermore, the resonant coaxial nanoaperture enables real-time label-free detection of the trapping events via simple transmission measurements. Our fabrication technique is scalable and reproducible, since the critical nanogap dimension is defined by atomic layer deposition. Thus our platform shows significant potential to push the limit of optical trapping technologies.

Original languageEnglish (US)
Pages (from-to)3637-3642
Number of pages6
JournalNano letters
Volume18
Issue number6
DOIs
StatePublished - Jun 13 2018

Keywords

  • Optical trapping
  • atomic layer lithography
  • coaxial aperture
  • gap plasmon
  • nanogap
  • optical force

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