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Polarization dependent plasmonic modes in elliptical graphene disk arrays
Optics Express
|January 31, 2019
Summary
Elliptical graphene disks exhibit tunable mid-infrared plasmonic modes. Their polarization-dependent optical properties enable dynamic control for advanced photonic devices.
Area of Science:
- Condensed Matter Physics
- Nanophotonics
- Materials Science
Background:
- Graphene's unique electronic properties enable plasmonic applications.
- Controlling plasmonic modes in nanostructures is crucial for photonic devices.
Purpose of the Study:
- To investigate mid-infrared plasmonic modes in elliptical graphene disk arrays.
- To derive analytical expressions for mode behavior and experimentally characterize them.
- To explore the tunability and polarization dependence of these modes.
Main Methods:
- Theoretical derivation of analytical expressions for plasmonic modes.
- Fabrication of elliptical graphene disks.
- Polarization-resolved extinction spectroscopy for characterization.
Main Results:
- Existence of two orthogonal electrical dipole plasmonic modes in elliptical graphene disks.
- Demonstration of polarization-dependent excitation and dynamic tuning of modes via Fermi energy modulation.
- Observation of coupling between plasmonic modes and substrate surface phonons, forming polarized plasmon-phonon polaritons.
Conclusions:
- Elliptical graphene disks offer versatile platforms for mid-infrared plasmonics.
- Tunable and polarization-controlled modes provide enhanced design flexibility for photonic devices.
- Potential for developing novel polarization-resolved optical components and sensors.
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