Evolution of near- and far-field optical properties of Au bipyramids upon epitaxial deposition of Ag

Nanoscale ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 5402-5411 ◽  
Author(s):  
Min Xi ◽  
Björn M. Reinhard
Keyword(s):  
Optical Properties ◽  
Near Field ◽  
Optical Response ◽  
Silicon Substrates ◽  
Far Field ◽  
Epitaxial Deposition

The effect of composition and tip morphology on the far-field optical response of Ag–Au–Ag nanorods with Au bipyramid core is quantified, and the near-field associated with standing plasmon waves in nanorods on silicon substrates is investigated.

scholarly journals Defect tolerance and the effect of structural inhomogeneity in plasmonic DNA-nanoparticle superlattices

2015 ◽  
Vol 112 (33) ◽  
pp. 10292-10297 ◽  
Author(s):  
Michael B. Ross ◽  
Jessie C. Ku ◽  
Martin G. Blaber ◽  
Chad A. Mirkin ◽  
George C. Schatz
Keyword(s):  
Optical Properties ◽  
Volume Fraction ◽  
Near Field ◽  
Optical Cavity ◽  
Optical Response ◽  
Structural Inhomogeneity ◽  
Far Field ◽  
Plasmonic Nanoparticle ◽  
Volume Fractions ◽  
Nanoparticle Superlattices

Bottom-up assemblies of plasmonic nanoparticles exhibit unique optical effects such as tunable reflection, optical cavity modes, and tunable photonic resonances. Here, we compare detailed simulations with experiment to explore the effect of structural inhomogeneity on the optical response in DNA-gold nanoparticle superlattices. In particular, we explore the effect of background environment, nanoparticle polydispersity (>10%), and variation in nanoparticle placement (∼5%). At volume fractions less than 20% Au, the optical response is insensitive to particle size, defects, and inhomogeneity in the superlattice. At elevated volume fractions (20% and 25%), structures incorporating different sized nanoparticles (10-, 20-, and 40-nm diameter) each exhibit distinct far-field extinction and near-field properties. These optical properties are most pronounced in lattices with larger particles, which at fixed volume fraction have greater plasmonic coupling than those with smaller particles. Moreover, the incorporation of experimentally informed inhomogeneity leads to variation in far-field extinction and inconsistent electric-field intensities throughout the lattice, demonstrating that volume fraction is not sufficient to describe the optical properties of such structures. These data have important implications for understanding the role of particle and lattice inhomogeneity in determining the properties of plasmonic nanoparticle lattices with deliberately designed optical properties.

scholarly journals Effect of Film Thickness on the Far- and Near-Field Optical Response of Nanoparticle-on-Film Systems

2019 ◽  
Author(s):  
Rachel Armstrong ◽  
Willeke van Liempt ◽  
Peter Zijlstra
Keyword(s):  
Film Thickness ◽  
Near Field ◽  
Field Enhancement ◽  
Optical Response ◽  
Resonance Wavelength ◽  
Skin Depth ◽  
Far Field ◽  
Vertical Antenna ◽  
Antenna Mode ◽  
Good Agreement

<p>We study the near-field and far-field optical response of nanoparticle-on-film systems using single-nanoparticle spectroscopy and numerical simulations. We find that the optical spectra contain three dominant modes - a transverse dipole and quadrupole mode, and a dominant vertical antenna mode. We vary the thickness of the metal film from 10 – 45 nm, and find that the vertical antenna mode wavelength is nearly independent of the film thickness. In contrast, we find that the associated near-field enhancement in the gap between the particle and the film strongly depends on the film thickness. This trend is also observed in the far-field where the vertical antenna mode strongly increases in amplitude for increasing film-thicknesses up to the skin depth of gold. These findings are in good agreement with a numerical model and pave the way to study field-mediated processes such as fluorescence, SERS, and localized chemistry at the same resonance wavelength but at varying degrees of field enhancement.</p>

Near-field and far-field optical properties of thin metallic films

2001 ◽  
Vol 89 (2) ◽  
pp. 1138-1144 ◽  
Author(s):  
B. Dumay ◽  
N. Richard ◽  
T. David ◽  
E. Bourillot ◽  
F. Scheurer ◽  
...  
Keyword(s):  
Optical Properties ◽  
Near Field ◽  
Far Field ◽  
Metallic Films

Lattice plasmon modes in an asymmetric environment: from far-field to near-field optical properties

2019 ◽  
Vol 36 (7) ◽  
pp. E36 ◽  
Author(s):  
Iman Ragheb ◽  
Macilia Braik ◽  
Abdelaziz Mezeghrane ◽  
Leïla Boubekeur-Lecaque ◽  
Abderrahmane Belkhir ◽  
...  
Keyword(s):  
Optical Properties ◽  
Near Field ◽  
Far Field ◽  
Asymmetric Environment ◽  
Plasmon Modes

scholarly journals Effect of Film Thickness on the Far- and Near-Field Optical Response of Nanoparticle-on-Film Systems

2019 ◽  
Author(s):  
Rachel Armstrong ◽  
Willeke van Liempt ◽  
Peter Zijlstra
Keyword(s):  
Film Thickness ◽  
Near Field ◽  
Field Enhancement ◽  
Optical Response ◽  
Resonance Wavelength ◽  
Skin Depth ◽  
Far Field ◽  
Vertical Antenna ◽  
Antenna Mode ◽  
Good Agreement

<p>We study the near-field and far-field optical response of nanoparticle-on-film systems using single-nanoparticle spectroscopy and numerical simulations. We find that the optical spectra contain three dominant modes - a transverse dipole and quadrupole mode, and a dominant vertical antenna mode. We vary the thickness of the metal film from 10 – 45 nm, and find that the vertical antenna mode wavelength is nearly independent of the film thickness. In contrast, we find that the associated near-field enhancement in the gap between the particle and the film strongly depends on the film thickness. This trend is also observed in the far-field where the vertical antenna mode strongly increases in amplitude for increasing film-thicknesses up to the skin depth of gold. These findings are in good agreement with a numerical model and pave the way to study field-mediated processes such as fluorescence, SERS, and localized chemistry at the same resonance wavelength but at varying degrees of field enhancement.</p>

Plasmonic nanoparticle simulations and inverse design using machine learning

Nanoscale ◽  
2019 ◽  
Vol 11 (37) ◽  
pp. 17444-17459 ◽  
Author(s):  
Jing He ◽  
Chang He ◽  
Chao Zheng ◽  
Qian Wang ◽  
Jian Ye
Keyword(s):  
Machine Learning ◽  
Optical Properties ◽  
Near Field ◽  
Inverse Design ◽  
Plasmonic Nanoparticles ◽  
Far Field ◽  
Resource Saving ◽  
Computing Resource ◽  
Plasmonic Nanoparticle

Ultrafast and computing resource-saving prediction of the far- and near-field optical properties of plasmonic nanoparticles and inverse design of their dimensions from the far-field spectra can be realized using machine learning.

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