From Near-Field to Far-Field Coupling in the Third Dimension: Retarded Interaction of Particle Plasmons

Nano Letters ◽  
2011 ◽  
Vol 11 (10) ◽  
pp. 4421-4424 ◽  
Author(s):  
Richard Taubert ◽  
Ralf Ameling ◽  
Thomas Weiss ◽  
André Christ ◽  
Harald Giessen
Keyword(s):  
Near Field ◽  
Far Field ◽  
Field Coupling ◽  
The Third ◽  
Third Dimension

scholarly journals Collective photonic response of high refractive index dielectric metasurfaces

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Sushanth Reddy Amanaganti ◽  
Miha Ravnik ◽  
Jayasri Dontabhaktuni
Keyword(s):  
Refractive Index ◽  
Computer Modelling ◽  
Near Field ◽  
High Refractive Index ◽  
Tuning Parameter ◽  
Far Field ◽  
Strong Suppression ◽  
Perfect Absorption ◽  
Field Coupling ◽  
Multipole Analysis

Abstract Sub-wavelength periodic nanostructures give rise to interesting optical phenomena like effective refractive index, perfect absorption, cloaking, etc. However, such structures are usually metallic which results in high dissipative losses and limitations for use; therefore, dielectric nanostructures are increasingly considered as a strong alternative to plasmonic (metallic) materials. In this work, we show light-matter interaction in a high refractive index dielectric metasurface consisting of an array of cubic dielectric nano-structures made of very high refractive index material, Te in air, using computer modelling. We observe a distinct band-like structure in both transmission and reflection spectra resulting from the near-field coupling of the field modes from neighboring dielectric structures followed by a sharp peak in the transmission at higher frequencies. From the spatial distribution of the electric and magnetic fields and a detailed multipole analysis in both spherical harmonics and Cartesian components, the dominant resonant modes are identified to be electric and magnetic dipoles. Specifically at lower frequency (60 THz) a novel anapole-like state characterized by strong-suppression in reflection and absorption is observed, reported very recently as ‘lattice-invisibility’ state. Differently, at higher frequency (62 THz), strong absorption and near-zero far field scattering are observed, which combined with the field profiles and the multipole analysis of the near-fields indicate the excitation of an anapole. Notably the observed novel modes occur in the simple geometry of dielectric cubes and are a result of collective response of the metasurfaces. Periodicity of the cubic metasurface is shown as the significant material tuning parameter, allowing for the near-field and far-field coupling effects of anapole metasurface. More generally, our work is a contribution towards developing far-fetching applications based on metamaterials such as integrated devices and waveguides consisting of non-radiating modes.

scholarly journals Near- to Far-Field Coupling of Evanescent Waves by Glass Microspheres

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 73
Author(s):  
Rayenne Boudoukha ◽  
Stephane Perrin ◽  
Assia Demagh ◽  
Paul Montgomery ◽  
Nacer-Eddine Demagh ◽  
...  
Keyword(s):  
Near Field ◽  
High Spatial Frequency ◽  
Super Resolution ◽  
Evanescent Waves ◽  
Whispering Gallery Modes ◽  
Far Field ◽  
Whispering Gallery ◽  
Field Coupling ◽  
Electromagnetic Simulations ◽  
Propagating Waves

Through rigorous electromagnetic simulations, the natural coupling of high-spatial-frequency evanescent waves from the near field to the far field by dielectric microspheres is studied in air. The generation of whispering gallery modes inside the microspheres is shown independently of any resonance. In addition, the conversion mechanism of these evanescent waves into propagating waves is analysed. This latter point leads to key information that allows a better physical understanding of the super-resolution phenomenon in microsphere-assisted microscopy where sub-diffraction-limit revolving power is achieved.

scholarly journals Effective Antenna Modellings for NF-FF Transformations with Spherical Scanning Using the Minimum Number of Data

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Francesco D'Agostino ◽  
Flaminio Ferrara ◽  
Claudio Gennarelli ◽  
Rocco Guerriero ◽  
Massimo Migliozzi
Keyword(s):  
Electromagnetic Fields ◽  
Near Field ◽  
Two Dimensions ◽  
Geometric Parameters ◽  
Optimal Sampling ◽  
Far Field ◽  
Aperture Diameter ◽  
The Third ◽  
Numerical Tests ◽  
Minimum Number

Two efficient probe-compensated near-field-far-field transformations with spherical scanning for antennas having two dimensions very different from the third one are here developed. They rely on the nonredundant sampling representations of the electromagnetic fields and on the optimal sampling interpolation expansions, and use effective antenna modellings. In particular, an antenna with a predominant dimension is no longer considered as enclosed in a sphere but in a cylinder ended in two half spheres, whereas a surface formed by two circular “bowls” with the same aperture diameter but different lateral bends is adopted to shape an antenna with two predominant dimensions. These modellings are able to fit very well a lot of antennas by properly setting their geometric parameters. It is so possible to remarkably lower the number of data to be acquired, thus significantly reducing the measurement time. Numerical tests assessing the accuracy and the robustness of the techniques are reported.

Determining Far-Field EMI From Near-Field Coupling of a Power Converter

2014 ◽  
Vol 29 (10) ◽  
pp. 5257-5264 ◽  
Author(s):  
Henglin Chen ◽  
Tao Wang ◽  
Limin Feng ◽  
Guozhu Chen
Keyword(s):  
Near Field ◽  
Power Converter ◽  
Far Field ◽  
Field Coupling

Effect of near-field coupling on far-field inelastic scattering imaging of gold nanoparticles

2008 ◽  
Vol 19 (39) ◽  
pp. 395705 ◽  
Author(s):  
YuMeng You ◽  
ChaoLing Du ◽  
Yun Ma ◽  
Johnson Kasim ◽  
Ting Yu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Inelastic Scattering ◽  
Near Field ◽  
Far Field ◽  
Field Coupling
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