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Gigahertz Optomechanical Modulation by Split-Ring-Resonator Nanophotonic Meta-Atom Arrays
Yuta Imade1, Ronald Ulbricht1, Motonobu Tomoda1
1Division of Applied Physics, Graduate School of Engineering, Hokkaido University , Sapporo 060-8628, Japan.
Nano Letters
|September 16, 2017
Summary
We studied vibrating nanophotonic resonators using transient reflection spectroscopy. Acousto-plasmonic interactions in these U-shaped split-ring resonators drive ultrafast optical modulation.
Area of Science:
- Nanophotonics
- Metasurfaces
- Acousto-optics
Background:
- Metasurfaces with U-shaped split-ring resonators (SRRs) exhibit coupled optical and mechanical resonances.
- Understanding nanomechanical dynamics is crucial for ultrafast optical modulation.
Purpose of the Study:
- To investigate the multimodal vibrational response of nanophotonic SRR metasurfaces.
- To elucidate the nanomechanical dynamics responsible for ultrafast optical modulation.
Main Methods:
- Utilized polarization-resolved transient reflection spectroscopy.
- Employed visible-pump to probe gigahertz oscillations in reflected infrared light.
- Performed numerical simulations of transient deformations and strain fields.
Main Results:
- Observed colocalized optical and mechanical resonances in the SRR metasurface.
- Detected gigahertz oscillations in reflected light intensity, indicating vibrational response.
- Simulations revealed acousto-plasmonic interactions via SRR gap dynamics as the dominant effect.
Conclusions:
- Acousto-plasmonic interactions in vibrating SRRs are key to ultrafast optical modulation.
- This research enables advancements in ultrafast acoustooptic modulators and sensing technologies.
