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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
Electromagnetic coupling of light into a silicon solar cell by nanodisk plasmons
TL;DR: In this article, photocurrents of silicon pn junctions patterned with arrays of elliptical Au nanodisks were experimentally and theoretically investigated near the particle plasmon resonance wavelengths, for varying light polarizations and angles of incidence.
Journal ArticleDOI
Characterization of a volumetric metamaterial realization of an artificial magnetic conductor for antenna applications
TL;DR: In this paper, a volumetric metamaterial realization of an artificial magnetic conductor (AMC) is presented, and the performance of a dipole antenna radiating in the presence of this metammaterial AMC is quantified numerically.
Journal ArticleDOI
Conformal transformation optics
Lin Xu,Huanyang Chen +1 more
TL;DR: Transformation optics is a modern application of Maxwell's equations offering unprecedented control over the flow of light that exploits spatially customized optical properties and mathematical techniques applied to space-time curvature as discussed by the authors.
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Gold Nanoparticle Plasmonic Superlattices as Surface-Enhanced Raman Spectroscopy Substrates
Cristiano Matricardi,Christoph Hanske,Juan Luis Garcia-Pomar,Judith Langer,Agustín Mihi,Luis M. Liz-Marzán +5 more
TL;DR: Electromagnetic modeling of the physical origin of the underlying hybrid modes is presented and the application of superlattice arrays as surface-enhanced Raman scattering (SERS) spectroscopy substrates which can be tailored for a specific probe laser are demonstrated.
Journal ArticleDOI
Recent Progress on Plasmon-Enhanced Fluorescence
TL;DR: A review of recent advanced reports on plasmon-enhanced fluorescence (PEF) can be found in this article, where the authors provide an introduction to PEF, illustrates the current progress in the design of metallic nanostructures for efficient fluorescence signal amplification that utilises propagating and localised surface plasmons.