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Levitated Plasmonic Nanoantennas in an Aqueous Environment
Yazgan Tuna1,2, Ji Tae Kim1, Hsuan-Wei Liu1,2
1Max Planck Institute for the Science of Light , Staudt-Straße 2, 91058 Erlangen, Germany.
ACS Nano
|July 12, 2017
Summary
We manipulated plasmonic nanoantennas in water using an electrostatic trap. This enabled an 8-fold fluorescence enhancement from quantum dots, paving the way for liquid-solid interface applications.
Area of Science:
- Nanotechnology
- Plasmonics
- Quantum Optics
Background:
- Plasmonic nanoantennas offer unique optical properties.
- Controlling nanoantennas at liquid-solid interfaces is challenging.
Purpose of the Study:
- To demonstrate precise manipulation of plasmonic nanoantennas in aqueous solutions.
- To achieve fluorescence enhancement using near-field interactions.
Main Methods:
- Utilizing an electrostatic trap between a nanopipette and substrate.
- Scanning a trapped gold nanosphere near a quantum dot.
- Employing numerical electromagnetic simulations.
Main Results:
- Achieved approximately 8-fold fluorescence enhancement.
- Demonstrated enhancement over a narrow spatial region (45 nm FWHM).
- Validated experimental results with theoretical predictions.
Conclusions:
- Electrostatic trapping enables effective nanoantenna manipulation in liquid.
- This technique enhances quantum dot fluorescence via plasmonic near-field coupling.
- Potential applications in liquid-solid interface plasmonics.
