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Probing Surface Plasmon Dynamics in Periodic Nanostructures through Ultrafast Electron Microscopy
Ibrahim Tanriover1, Thomas E Gage1, Ralu Divan1
1Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States.
ACS Nano
|August 20, 2025
Summary
Researchers studied surface plasmon polaritons (SPPs) in nanostructures using advanced microscopy. Array geometry dictates SPP patterns, while polarization influences intensity, crucial for future photonic technologies.
Area of Science:
- Photonics and Nanotechnology
- Plasmonics and Light-Matter Interactions
Background:
- Surface plasmon polaritons (SPPs) enable subwavelength light manipulation for applications in sensing and quantum computing.
- Periodic nano- and microstructures offer tunable SPP properties through structural design.
Purpose of the Study:
- To investigate the mode formation, coupling, interference, and decay of SPPs in ordered nanostructure arrays.
- To understand the influence of array geometry and excitation polarization on SPP dynamics.
Main Methods:
- Photon-induced near-field electron microscopy (PINEM) for mode analysis and time-resolved measurements.
- Cathodoluminescence (CL) spectroscopy for intrinsic plasmonic characterization.
- Finite difference time domain (FDTD) simulations for validation.
Main Results:
- Array periodicity and symmetry primarily determine SPP interference patterns and orientation.
- Pump polarization modulates SPP intensity, while time-resolved PINEM reveals spatial dependence of temporal characteristics.
- FDTD simulations show excellent agreement with experimental PINEM and CL data.
Conclusions:
- The study elucidates the spatiotemporal dynamics of SPPs on nanostructures.
- Findings are critical for optimizing plasmonic structures for advanced photonic and quantum technologies.
