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Plasmonics

Can DNA origami be used to print tiny gold antennas?

Shen B, Linko V, Tapio K, et al. · Science advances · 2018

Open access · cc by · source: Europe PMC

Using folded DNA shapes as stencils, the team made gold nanostructures with features around 10 nm whose optical resonances matched simulations.

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Study at a glance

Design
Other — Lab fabrication of gold nanostructures using DNA origami as a lithographic stencil, characterized by AFM/SEM, dark-field single-particle scattering, Raman and circular dichroism, with finite-element simulations for comparison.
N
No single sample size; bowtie uniformity was assessed on numerous antennas from one batch, and the exact count is not given in the main text.
Population
DNA-origami-templated gold nanostructures (bowties, crosses, chiral double-L shapes) on sapphire or silicon nitride
Outcome
Feature size and uniformity, localized plasmon resonance wavelengths, SERS signal, circular dichroism spectra

Structured fields used in claim comparison tables when every cited study has a complete layer.

Key findings

Bowtie antennas were about 125 nm long with gaps of 12 plus or minus 5 nm and thickness about 21.6 nm, the smallest all-metal bowties reported. The gap mode scattered most strongly near 704 nm, longer in wavelength than the perpendicular mode, matching simulations; simulated batch variations shifted the resonance by only about 8.5 to 12.5 nm. Bowties gave clear Raman signals from two dye markers while bare areas gave none. Adding 114 single-stranded DNA overhangs biased chiral shapes to land in one orientation up to 99%, producing a clear circular dichroism signal absent in randomly oriented samples.

Methodology

The researchers folded DNA into bowtie, cross and chiral double-L shapes, laid them on a silicon-coated transparent chip, and grew silicon dioxide around them so the DNA left shaped holes. They etched through these holes, evaporated gold, and removed the stencil to leave gold copies of the DNA shapes. They then measured single-particle scattering spectra with polarized light, tested bowties for surface-enhanced Raman scattering, and measured circular dichroism of chiral samples, comparing with finite-element simulations.

Limitations

The paper shows feasibility rather than a systematic comparison of enhancement against other fabrication methods; the SERS result is qualitative with no enhancement factor. Fabrication yield and many details are in supplementary notes not included here. The claim of cheap wafer-scale production is a forecast, not demonstrated; structures were deposited at random positions rather than in ordered arrays.

How this study connects

Role on claims

Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.

  • SupportsPlasmonic nanogaps and field enhancementconcept

    Self-assembled stencils can make gaps near 10 nm with predictable resonances.

    DNA-origami-assisted lithography made gold bowtie antennas with 12 +/- 5 nm gaps whose gap-mode resonance near 704 nm matched simulation and gave SERS signals from dye markers absent on bare areas.

    Evidence for the claim as stated.

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