Related Experiment Video
Updated: Jun 9, 2026
10:14
Fabrication and Operation of Acoustofluidic Devices Supporting Bulk Acoustic Standing Waves for Sheathless Focusing of Particles
Published on: March 6, 2016
12.8K
Focusing Surface Acoustic Waves with a Plasmonic Hypersonic Lens
Hilario D Boggiano1, Lin Nan2, Gustavo Grinblat1,3
1Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, 1428 Buenos Aires, Argentina.
Nano Letters
|May 16, 2024
Summary
Researchers created a nanoscale acoustic lens using gold nanodisks. This device focuses hypersonic acoustic waves into a narrow beam, enabling precise mechanical probing with high sensitivity.
Area of Science:
- Plasmonics and Nanophotonics
- Acoustics and Mechanics
- Materials Science
Background:
- Plasmonic nanoantennas convert optical to mechanical energy.
- Ultrafast optical pulses induce thermal expansion and hypersonic acoustic waves.
- Nanoantennas can detect these waves, acting as sensitive mechanical probes.
Purpose of the Study:
- To propose and demonstrate a nanoscale acoustic lens.
- To generate and control gigahertz hypersonic acoustic waves.
- To achieve high-resolution acoustic focusing and mapping.
Main Methods:
- Fabrication of a nanoscale acoustic lens using 11 gold nanodisks.
- Excitation with ultrafast optical pulses to generate acoustic waves.
- Spatially decoupled pump-probe experiments for acoustic energy mapping.
Main Results:
- Demonstration of a diffraction-limited surface acoustic beam with 340 nm width.
- Achieved 60% amplitude contrast in the acoustic beam.
- Experimental results showed good agreement with continuum elastic theory.
Conclusions:
- The proposed nanoscale acoustic lens effectively focuses hypersonic acoustic waves.
- This technology enables high-sensitivity mechanical probing at the nanoscale.
- The findings advance the understanding of light-sound interactions in nanostructures.
