Tailoring toroidal and magnetic dipole excitations with the same dielectric structure

Area of Science:

• Nanophotonics
• Metamaterials
• Electromagnetics

Background:

• Toroidal dipole (TD) and magnetic dipole (MD) excitations are often weak.
• These excitations are crucial for optical responses in nanostructures.
• Previous designs focused on individual TD or MD tailoring.

Purpose of the Study:

• To demonstrate a single nanostructure capable of tailoring both TD and MD excitations simultaneously.
• To enable efficient control over both toroidal and magnetic dipole responses within one structure.

Main Methods:

• Design of novel nanostructures.
• Utilizing various electric dipoles to excite resonances.
• Numerical simulations to analyze optical response.

Main Results:

• Achieved near-perfect TD and MD excitations from the same nanostructure.
• Demonstrated simultaneous excitation of both dipole types.

Conclusions:

• A single nanostructure can be engineered for dual TD and MD excitations.
• This finding is highly beneficial for developing optical functional devices.
• Potential applications include advanced nanoantennas and highly sensitive sensors.