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Jun, Young Chul
Laboratory of Nanophotonics & Metamaterials
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Geometry-Independent Excitation of Dark Modes Using Dipole Moment Transitions

Author(s)
Nguyen, Thi Hai-YenJeong, Hoon YeubJun, Young ChulByun, Gangil
Issued Date
2020-08
DOI
10.1109/TAP.2020.2983770
URI
https://scholarworks.unist.ac.kr/handle/201301/48074
Fulltext
https://ieeexplore.ieee.org/document/9055388
Citation
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, v.68, no.8, pp.6172 - 6182
Abstract
Despite numerous potential advantages of subradiative dark modes due to an extremely high quality (Q) factor, the practicality still depends on the consistency of excitations for a tight fabrication tolerance. This article proposes a novel approach to adaptive transitions between different dipole moments to allow for consistent excitation of Fano and electric quadrupole resonances that are extremely sensitive to geometric errors. The proposed geometry of each metamolecule consists of four strips printed on a thin dielectric film with four gaps between the strips, and the geometric error is described as structural deformation by adjusting the strip lengths and gap sizes in the vertical direction. In each deformed state, current and magnetic-field distributions are analyzed to interpret operating principles, and multipole moments are calculated based on the multipole expansion using the current distributions. The results demonstrate that the consistent excitation of the electric quadrupole moment is enabled based on a simultaneous transition between toroidal and electric dipole moments, and the Fano resonance is consistently excited by the magnetic-to-electric dipole moment transition. For verification, original and deformed metasurfaces are fabricated, and their transmission and reflection coefficients are measured in a semianechoic chamber to experimentally validate the proposed dipole moment transitions. The results confirm that the proposed approach has great potential to bring advances in recent sensing and energy harvesting applications where an extremely high Q-factor is essential.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
ISSN
0018-926X
Keyword (Author)
Dark modeenergy harvestinghigh quality (Q) factorhigh Q resonancemetasurfacemicrowave sensingsubradiative resonance
Keyword
ELECTROMAGNETICALLY INDUCED TRANSPARENCYFANOMETAMATERIALGRAPHENEANALOG

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