Geometric effects on far-field coupling between multipoles of nanoparticles in square arrays

2011 ◽  
Vol 29 (1) ◽  
pp. 88 ◽  
Author(s):  
Drew DeJarnette ◽  
D. Keith Roper ◽  
Braden Harbin
Keyword(s):  
Far Field ◽  
Field Coupling ◽  
Geometric Effects

Manipulation of Plasmon Dephasing Time in Nanostructure Arrays Via the Far-Field Coupling

Plasmonics ◽  
2021 ◽  
Author(s):  
Yang Xu ◽  
Yulu Qin ◽  
Boyu Ji ◽  
Xiaowei Song ◽  
Jingquan Lin
Keyword(s):  
Far Field ◽  
Dephasing Time ◽  
Field Coupling ◽  
Nanostructure Arrays

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.

Far-field coupling in nanobeam photonic crystal cavities

2016 ◽  
Vol 108 (20) ◽  
pp. 201104 ◽  
Author(s):  
Ian Rousseau ◽  
Irene Sánchez-Arribas ◽  
Jean-François Carlin ◽  
Raphaël Butté ◽  
Nicolas Grandjean
Keyword(s):  
Photonic Crystal ◽  
Far Field ◽  
Photonic Crystal Cavities ◽  
Field Coupling

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

Enhancement of Electroluminescent Green Emission by Far-Field Coupling of Au Nanoparticles in Organic Light Emitting Diodes

2017 ◽  
Vol 56 (24) ◽  
pp. 6952-6961 ◽  
Author(s):  
Jayaraman Jayabharathi ◽  
Palanisamy Sujatha ◽  
Venugopal Thanikachalam ◽  
Palanivel Jeeva ◽  
Sekar Panimozhi
Keyword(s):  
Au Nanoparticles ◽  
Light Emitting Diodes ◽  
Green Emission ◽  
Organic Light Emitting Diodes ◽  
Far Field ◽  
Light Emitting ◽  
Field Coupling ◽  
Organic Light

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.

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