Magnetoplasmonic crystal waveguide

Area of Science:

• Condensed matter physics
• Nanophotonics
• Magneto-optics

Background:

• Magnetoplasmonic crystals combine plasmonics and magnetism.
• Surface plasmon-polaritons (SPPs) are crucial for optical phenomena.
• Existing designs face limitations in sensitivity and robustness.

Purpose of the Study:

• To propose and fabricate a novel insulator-metal-insulator magnetoplasmonic crystal waveguide.
• To investigate the coupling of surface plasmon-polaritons in this new structure.
• To explore its potential for advanced sensor applications.

Main Methods:

• Fabrication of a waveguide using a gold grating between two garnet layers.
• Development of a non-perturbing deposition method for the magneto-dielectric layer.
• Experimental characterization of magneto-optical effects using transmission spectra.

Main Results:

• Demonstrated coupling of SPPs on opposite Au/garnet interfaces.
• Observed a high-quality resonance for long-range SPPs.
• Measured a broad 60 nm resonance for short-range SPPs, distinct from traditional crystals.

Conclusions:

• The proposed waveguide structure exhibits unique magneto-optical properties.
• The findings offer a new platform for developing highly sensitive and robust magnetoplasmonic sensors.
• This work advances the field of nanophotonics and magneto-plasmonic devices.