Magnetic Octupole Response of Dielectric Quadrumers

The development of new approaches to tuning the resonant magnetic response of simple all‐dielectric nanostructures is very important in modern nanophotonics. Here, it is shown that a resonant magnetic octupole (MOCT) response can be obtained by dividing a solid rectangular silicon block to a quadrum...

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Bibliographic Details
Published in:Laser & photonics reviews 2020-04, Vol.14 (4), p.n/a
Main Authors: Terekhov, Pavel D., Evlyukhin, Andrey B., Redka, Dmitrii, Volkov, Valentyn S., Shalin, Alexander S., Karabchevsky, Alina
Format: Article
Language:English
Subjects:
Electromagnetic absorption
Energy harvesting
magnetic hot‐spots
magnetic octupole
Metamaterials
oligomers
quadrumers
Resonance
Silicon
silicon photonics
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Summary:The development of new approaches to tuning the resonant magnetic response of simple all‐dielectric nanostructures is very important in modern nanophotonics. Here, it is shown that a resonant magnetic octupole (MOCT) response can be obtained by dividing a solid rectangular silicon block to a quadrumer structure with the introduction of narrow gaps between four nanocubes. The spectral position of the MOCT resonance is controlled and tuned by varying the distance between the nanocubes. It is demonstrated that several magnetic hot‐spots related to the MOCT resonance can be located in the gaps creating a strong magnetic field gradient in free space. It is observed that the resonant excitation of the MOCT moment leads to a significant enhancement of light absorption in the system at the spectral region, where light absorption in bulk silicon is weak. The results of this work can be applied to design new composite antennas and metamaterials based on complex building blocks, energy harvesting devices, and molecular trapping with magnetic hot‐spots. Involving high‐order multipoles can expand functional properties of photonic systems at different frequency ranges. The excitation of magnetic octupole moment has been achieved by nanostructuring. This effect provides magnetic hot‐spots generation and high energy absorption in the near‐infrared. The shown approach can be useful to avoid diffraction in metasurfaces supporting high‐order multipole excitation and contributes to a variety of applications.
ISSN:1863-8880
1863-8899
DOI:10.1002/lpor.201900331