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Temporal Dynamics of Collective Resonances in Periodic Metasurfaces.
Radoslaw Kolkowski1,2, Annemarie Berkhout2, Sylvianne D C Roscam Abbing2,3
1Department of Applied Physics, Aalto University, P.O. Box 13500, Aalto FI-00076, Finland.
ACS Photonics
|June 24, 2024
Summary
We developed a new interferometric autocorrelation method to study optical near-field dynamics in metasurfaces. This technique reveals detailed temporal characteristics of waveguide-plasmon polaritons, crucial for understanding light-matter interactions.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Temporal dynamics of optical fields offer deeper insights into light-matter interactions than frequency-domain analysis alone.
- Periodic metasurfaces support collective resonances that significantly enhance optical near-fields.
- Waveguide-plasmon polaritons in coupled nanoparticle arrays are key to understanding these enhanced fields.
Purpose of the Study:
- To present a novel experimental approach for probing the temporal dynamics of optical near-fields in metasurfaces.
- To investigate waveguide-plasmon polaritons using enhanced two-photon excited luminescence (TPEL).
- To characterize the temporal behavior and properties of collective resonances.
Main Methods:
- Utilized interferometric autocorrelation (IAC) measurements enhanced by two-photon excited luminescence (TPEL) from quantum dots.
- Employed semiconductor quantum dots on plasmonic nanoparticle arrays to probe near-field enhancement.
- Analyzed IAC data, including conversion to spectrograms, to extract resonance characteristics.
Main Results:
- Observed interference fringes at delays significantly exceeding the incident pulse duration, indicating coherent dynamics.
- Determined high Q factors (>200) for collective resonances.
- Detected temporal beating between resonances, revealing their frequencies and contributions.
Conclusions:
- The developed IAC method successfully reveals coherent temporal dynamics of optical near-fields in metasurfaces.
- This technique provides a powerful tool for characterizing collective resonances, including their Q factors and inter-resonance dynamics.
- The findings open new avenues for time-resolved studies of complex optical systems and metasurfaces.
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