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Ultra-broadband and high-efficiency reflective polarization rotator based on fractal metasurface with multiple plasmon resonances
- Source :
- Optics Communications. 449:73-78
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- A fractal metasurface-based ultra-broadband and high conversion efficiency reflective polarization rotator (PR) is proposed. The linearly y-/x-polarized (LP) incident electromagnetic (EM) wave can be rotated over 90oafter reflection by the proposed metasurface. The unit cell of the proposed PR is designed based on the fractal cut-wire resonator. Compared with a typical cut-wire resonator exciting three resonances, the fractal one can generate an extra resonant frequency. An ultra-broad bandwidth with a polarization conversion ratio greater than 0.9 (PCR>0.90) can be obtained from 8.00 to 23.00 GHz (a fractional bandwidth of 96.8%) at normal incidence, which is realized by the combination of the four resonances. The physical working mechanism and the polarization conversion performance of the metasurface are analyzed by surface current and E-field distributions, simulations and explained based on numerical calculations and plasmon resonance modes. Good agreement between the experiments and simulations is obtained. Compared with traditional PRs and other published metasurface-based PRs, the proposed metasurface can achieve an ultra-broad band and a high efficiency with a sub-wavelength size of the unit cell. The use of fractal topologies provides a novel and efficient method to further upgrade resonance characteristics in the design of PR, and the scalable geometry of the design shows its potential applications at optical, terahertz, and microwave frequencies.
- Subjects :
- Terahertz radiation
Physics::Optics
02 engineering and technology
Fractal metasurface
01 natural sciences
010309 optics
Resonator
Optics
Fractal
High-efficiency
CHIRAL METAMATERIAL
0103 physical sciences
Electrical and Electronic Engineering
Physical and Theoretical Chemistry
Plasmon
Physics
Science & Technology
Polarization rotator
business.industry
Ultra-broadband
Energy conversion efficiency
Resonance
021001 nanoscience & nanotechnology
Polarization (waves)
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
CONVERSION
Multiple plasmon resonances
Physical Sciences
0210 nano-technology
business
Subjects
Details
- ISSN :
- 00304018
- Volume :
- 449
- Database :
- OpenAIRE
- Journal :
- Optics Communications
- Accession number :
- edsair.doi.dedup.....a80d21ae4d92e4ae12e237807c915059