Toroidal metasurface resonances in microwave waveguides.

Area of Science:

• Electromagnetics and Metamaterials
• Microwave Engineering
• Condensed Matter Physics

Background:

• All-dielectric metasurfaces offer unique electromagnetic properties.
• Microwave waveguides are fundamental components in RF and microwave systems.
• Emulating metasurface behavior in waveguides can lead to advanced functionalities.

Purpose of the Study:

• To theoretically investigate loading microwave waveguides with dielectric particle arrays.
• To emulate the properties of infinite, two-dimensional, all-dielectric metasurfaces within waveguides.
• To explore novel designs for "metasurface-loaded" microwave waveguides.

Main Methods:

• Theoretical investigation of dielectric cuboid scattering properties and multipole modes.
• Identification of conditions for exciting the anapole state in dielectric particles.
• Design and analysis of metasurfaces composed of dielectric cuboid lattices.
• Simulation of parallel-plate, rectangular, and microstrip waveguides loaded with dielectric cuboids.

Main Results:

• Dielectric cuboids can exhibit anapole states and strong toroidal resonances in metasurface designs.
• Parallel-plate and rectangular waveguides effectively reproduce metasurface properties at resonance.
• Microstrip lines loaded with a few dielectric particles also show resonant features.
• Waveguides loaded with dielectric particles demonstrate potential for emulating metasurface behavior.

Conclusions:

• Microwave waveguides can be engineered with dielectric particle arrays to mimic all-dielectric metasurfaces.
• This approach offers a novel paradigm for designing functional microwave components.
• Metasurface-loaded waveguides can serve as platforms for experimental metasurface studies.