Cited by 173Orbital Angular Momentum in OpticsPlasmonic and Surface Plasmon ResearchGold and Silver Nanoparticles Synthesis and Applications

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

Yoo, Daehan, Gurunatha, Kargal L., Choi, Han-Kyu, Mohr, Daniel A., Ertsgaard, Christopher T., Gordon, Reuven, Oh, Sang-Hyun·2018·Nano Letters

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.

Integrity signals

Registry

Crossref · 10.1021/acs.nanolett.8b00732

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61 of 61 references verified0 citation errors · 0 not checkable

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  • Molecular enrichment strategies bring additional working requirements for specific molecules, impeding global molecular recognition.

    “The molecular enrichment strategies, including functionalized chemical bonding17,18, chemical reaction19,20, physical adsorption21–23, optical trapping24 as well as passive trapping by undercut structure25–28 bring in the additional working requirements (e.g., chemical stimuli, temperature, pressure, pump power, etc.) for specific molecules, impeding the system for global molecular recognition.”
  • Three approaches to optimize nanoantenna sensing by increasing coupling efficiency μ are hotspot release, molecule enrichment, and squeezing adjacent nanoantennas into a nanogap.

    “Figure 2b summarizes three approaches to optimize nanoantenna sensing by increasing μ. Hotspots release is proposed to increase accessible sensing areas for analytes, which are usually blocked by the substrate, to further enhance the coupling efficiency25–28.”

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Authors
Yoo, D., Gurunatha, K. L., Choi, H.-K., Mohr, D. A., Ertsgaard, C. T., Gordon, R., & Oh, S.-H.
Affiliations
  • University of Minnesota (US)
  • University of Victoria (CA)
Corresponding author
  • Gordon, Reuven
  • Oh, Sang-Hyun
Venue
Nano Letters
Published
2018-05-15
Volume
18
Issue
6
Pages
3637-3642
ISSN
  • 1530-6984 (ISSN-L)
  • 1530-6992
OpenAlex
W2804438120
Cited by
173
References
61
Citations by year
2026: 7 · 2025: 14 · 2024: 15 · 2023: 22 · 2022: 20 · 2021: 33 · 2020: 27 · 2019: 27 · 2018: 8
FWCI
10.98
Type
journal article
Language
en
Open access
closed
Locations
  • Nano Letters (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Division of Electrical, Communications and Cyber Systems (ECCS 1610333)
  • Natural Sciences and Engineering Research Council of Canada (469469-2014)
  • National Science Foundation
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Orbital Angular Momentum in Optics
  • Physical Sciences › Engineering › Biomedical Engineering › Plasmonic and Surface Plasmon Research
  • Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Gold and Silver Nanoparticles Synthesis and Applications
Keywords
optical trapping, gold films, polystyrene nanoparticles, streptavidin, nanotweezers, low laser power, label-free detection, atomic layer deposition, nanogap, transmission measurement

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