TY - JOUR

T1 - Magnetic Octupole Response of Dielectric Quadrumers

AU - Terekhov, Pavel D.

AU - Evlyukhin, Andrey B.

AU - Redka, Dmitrii

AU - Volkov, Valentyn S.

AU - Shalin, Alexander S.

AU - Karabchevsky, Alina

N1 - Funding Information: The authors thank Svetlana Korinfskaya for help with the artistic work. This work was supported by the Israel Innovation Authority-Kamin Program, Grant. No. 62045 (Year 2). A.S.S. acknowledges the support of the Russian Fund for Basic Research within the projects 18-02-00414, 18-52-00005. The development of the analytical approach was partially supported by the Russian Science Foundation Grant No. 18-19-00684. Support from the the Russian Fund for Basic Research within the projects 18-29-02089 is acknowledged as well. Contribution of P.D.T. in the research was performed as a part of the joint Ph.D. program between the BGU and?ITMO.

PY - 2020/4/9

Y1 - 2020/4/9

N2 - 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.

AB - 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.

KW - magnetic hot-spots

KW - magnetic octupole

KW - oligomers

KW - quadrumers

KW - silicon photonics

UR - http://www.scopus.com/inward/record.url?scp=85081754141&partnerID=8YFLogxK

U2 - 10.1002/lpor.201900331

DO - 10.1002/lpor.201900331

M3 - Article

AN - SCOPUS:85081754141

VL - 14

JO - Laser and Photonics Reviews

JF - Laser and Photonics Reviews

SN - 1863-8880

IS - 4

M1 - 1900331

ER -