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Topologically protected plasmonic phases in randomized aperture gratings.
Maayan Fox1,2, Yuri Gorodetski3,4,5
1Electrical and Electronics Engineering Department, 407000, Ariel, Israel.
Scientific Reports
|January 18, 2023
Summary
We demonstrate surface plasmon excitation using topologically protected diffraction from randomized gratings. This method precisely controls light-plasmon interactions via geometric and dynamic phases, enabling polarization-dependent directional modes.
Area of Science:
- Optics and Photonics
- Condensed Matter Physics
- Materials Science
Background:
- Surface plasmons are collective electron oscillations on metal surfaces.
- Diffraction gratings are commonly used to manipulate light.
- Topological protection offers robustness against defects and disorder.
Purpose of the Study:
- To experimentally demonstrate surface plasmon excitation via topologically protected diffraction.
- To investigate the role of geometric and dynamic phases in plasmonic excitation.
- To achieve polarization-dependent control over plasmonic directional modes.
Main Methods:
- Fabrication of gratings with randomized periodicity.
- Experimental excitation of surface plasmons.
- Analysis of light-plasmon coupling using polarization-dependent measurements.
Main Results:
- Successful excitation of surface plasmons through topologically protected diffraction.
- Demonstration that plasmonic excitation is controlled by geometric and dynamic phases.
- Achieved precise, polarization-dependent interaction between incident light and specific plasmonic modes.
Conclusions:
- Topologically protected diffraction offers a novel route for surface plasmon excitation.
- The interplay of geometric and dynamic phases is crucial for tailored light-plasmon interactions.
- This approach enables robust and controllable excitation of directional plasmonic modes.
