scholarly journals Observation of near-field coupling in metal nanoparticle chains using far-field polarization spectroscopy

2002 ◽  
Vol 65 (19) ◽  
Author(s):  
Stefan A. Maier ◽  
Mark L. Brongersma ◽  
Pieter G. Kik ◽  
Harry A. Atwater
Keyword(s):  
Near Field ◽  
Metal Nanoparticle ◽  
Far Field ◽  
Polarization Spectroscopy ◽  
Field Coupling ◽  
Field Polarization ◽  
Nanoparticle Chains

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.

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

Surface plasmon “hot spots” detected by near-field polarization spectroscopy

2010 ◽  
Author(s):  
F. Tantussi ◽  
V. Clericò ◽  
C. Martella ◽  
V. Priya ◽  
F. Fuso ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Hot Spots ◽  
Near Field ◽  
Polarization Spectroscopy ◽  
Field Polarization

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.

SERS and RI sensing properties of heterogeneous dimers of Au and Si nanospheres

2021 ◽  
pp. 2150378
Author(s):  
Tian Yi Fu ◽  
Chao Ling Du ◽  
Yang Xi Chen ◽  
Ru Xin Zhang ◽  
Lu Sun ◽  
...  
Keyword(s):  
Noble Metal ◽  
Near Field ◽  
Resonance Energy ◽  
Metal Nanoparticle ◽  
Localized Surface Plasmon ◽  
Sensitivity Factor ◽  
Field Coupling ◽  
Extinction Spectra ◽  
Surface Enhanced Raman ◽  
Potential Applications

Heterogeneous dimers of Au and Si nanoparticles are expected to exhibit different plasmon properties from that of homogeneous noble metal nanoparticle dimers. It is crucial to unveil the potential applications in surface-enhanced Raman scattering (SERS) and refractive-index (RI) sensing of the prototype dimer of Au and Si nanospheres. The near-field coupling between the two components within the dimer is revealed to not affect the resonance energy of Si mode in the extinction spectra, but decrease that of Au mode. It also accounts for the plasmon ruler behavior of the fractional shifts of both its dipolar peak wavelength of localized surface plasmon resonance (LSPR) and corresponding RI sensitivity factor [Formula: see text], which provide another kind of substitute to estimate the gap distance in between components within the dimer as that of noble metal nanoparticle dimers. Additionally, by tracking the inflection point shift of the corresponding extinction spectra, its [Formula: see text] is revealed to improve 36% than that of traditional one. The maximum [Formula: see text] and SERS enhancement factor [Formula: see text] at 2 nm gap distance are demonstrated to reach 336 nm RIU[Formula: see text] and [Formula: see text], respectively. This work paves a new way for developing efficient SERS and RI sensing substrates by combining noble metal and dielectric nanoparticles.

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