A Generic Minimal Discrete Model for Toroidal Moments and Its Experimental Realization
arXiv:1605.02282 · doi:10.1103/PhysRevB.95.045403
Abstract
It is well known that a closed loop of magnetic dipoles can give rise to the rather elusive toroidal moment. However, artificial structures required to generate the necessary magnetic moments are typically optically large, complex to make and easily compromised by the kinetic inductance at high frequencies. Instead of using magnetic dipoles, we propose a minimal model based on just three aligned discrete electric dipoles in which the occurrence of resonant toroidal modes is guaranteed by symmetry. The advantage of this model is its simplicity and the same model supports toroidal moments from the microwave regime up to optical frequencies as exemplified by a three-antenna array and a system consisting of three nano-sized plasmonic particles. Both the microwave and high-frequency configurations exhibit non-radiating "anapoles". Experiments in the microwave regime confirm the theoretical predictions.
arXiv comment21 pages, 6 figures
References in corpus (13)
- Past Achievements and Future Challenges in 3D Photonic Metamaterials
- Quantum Plasmonics
- Non-Trivial Non-Radiating Excitation as a Mechanism of Resonant Transparency in Toroidal Metamaterials
- Negative effective permeability and left-handed materials at optical frequencies
- Dielectric Metamaterials with Toroidal Dipolar Response
- Extremely High Q-factor metamaterials due to Anapole Excitation
- Optical toroidal dipolar response by an asymmetric double-bar metamaterial
- Toroidal dipole induced transparency for core-shell nanoparticles
- Plasmonic modes in periodic metal nanoparticle chains: A direct dynamic eigenmode analysis
- All-optical Hall effect by the dynamic toroidal moment in a cavity-based metamaterial
- Exact dipolar moments of a localized electric current distribution
- Optical force on toroidal nanostructures: toroidal dipole versus renormalized electric dipole
- Core-Shell Structured Dielectric-Metal Circular Nanodisk Antenna: Gap Plasmon Assisted Magnetic Toroid-like Cavity Modes
Cited by in corpus (5)
- Extremely High Q-factor metamaterials due to Anapole Excitation
- Blueshift and Phase tunability in planar metamaterials with toroidal contribution
- Electromagnetic sources beyond common multipoles
- Unidirectional scattering induced by the toroidal dipole moment in the system of plasmonic nanoparticles
- Kirigami-based Flexible Metasurface with Reconfigurable Intrinsic Chirality from Zero to Near-unity