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Optical funnel: broadband and uniform compression of electromagnetic fields to an air neck
Fei Sun,Yichao Liu,Yibiao Yang +2 more
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TLDR
In this paper, an optical funnel is designed by precisely filling subwavelength ceramic blocks with a gradient refractive index inside a tapered waveguide, which is isotropic and all above unit.Abstract:
An optical funnel, which performs as a passive electromagnetic compressor, can guide electromagnetic waves from a wide inlet to a narrow outlet without reflectance/scattering and squeeze electromagnetic fields uniformly to an air neck. In this study, an optical funnel is designed by precisely filling subwavelength ceramic blocks with a gradient refractive index inside a tapered waveguide. The gradient refractive index is designed by transformation optics, which is isotropic and all above unit, thus exhibiting a broadband feature. Due to the mechanism of impedance matching over the whole funnel, extremely low reflectance/scattering and stable enhancement of fields can be achieved. The field enhancement factor in different regions of the funnel (e.g., in the air neck) can be flexibly designed just by modifying the funnel-width ratios.read more
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Artificial Perfect Electric Conductor-Perfect Magnetic Conductor Anisotropic Metasurface for Generating Orbital Angular Momentum of Microwave with Nearly Perfect Conversion Efficiency
TL;DR: In this article, the authors proposed two types of PEC (perfect electric conductor)-PMC (perfect magnetic conductor) anisotropic metasurfaces for OAM generation, one composed of azimuthally continuous loops and the other constructed by azimythally discontinuous dipole scatterers.
Journal ArticleDOI
Near-zero-index-featured Multi-band Highly Directional Radiator with Large Purcell Factors
TL;DR: In this article , a near-zero-index-featured resonator based on optical conformal mapping is proposed to achieve highly directional radiation by using dielectrics with refractive index n ≥ 1.
References
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Journal ArticleDOI
Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot.
Juan Xia,Jianwei Tang,Fanglin Bao,Yongcheng Sun,Maodong Fang,Guanjun Cao,Julian Evans,Sailing He +7 more
TL;DR: Nearly fully controllable local-field interferences in the nanogap of a nanoantenna are designed and experimentally demonstrated that in thenanogap, the spectral dispersion of the local- field response can exhibit tuneable Fano lineshapes with nearly vanishing Fano dips.
Journal ArticleDOI
Enhancement of electromagnetic energy by plasma antenna
TL;DR: In this paper, a plasma antenna can focus and enhance electromagnetic energy, and the electromagnetic energy density of focus spot can reach several hundred times larger than that of the incident wave, which opens up the possibilities for highly effective coupling power into receivers or focusing power into the specified location by plasma antenna.
Posted Content
Topological Fulde-Ferrell and Larkin-Ovchinnikov states in spin-orbit coupled lattice system
Yao-Wu Guo,Yan Chen +1 more
TL;DR: In this paper, a spin-orbit coupled lattice system under Zeeman fields provides an ideal platform to realize exotic pairing states, such as the topological superfluid/superconducting (tSC) state, which is gapped in the bulk but metallic at the edge, and the Fulde-Ferrell (FF) state (having a phase-modulated order parameter with a uniform amplitude).