Nanoparticle optical properties: Effect of separation distance on near field and far field of a pair of gold spherical nanoparticles

2019 ◽  
Author(s):  
Shafiqa Abdul Rahim ◽  
Azlan Abdul Aziz
Keyword(s):  
Optical Properties ◽  
Near Field ◽  
Separation Distance ◽  
Far Field ◽  
Spherical Nanoparticles

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.

Derivation of Far-field Gain Using a Gain Reduction Effect in the Fresnel Region

2020 ◽  
Vol 35 (10) ◽  
pp. 1137-1143
Author(s):  
Ilkyu Kim ◽  
Sun-Gyu Lee ◽  
Jeong-Hae Lee
Keyword(s):  
Power Transmission ◽  
Near Field ◽  
Separation Distance ◽  
Far Field ◽  
Preliminary Measurement ◽  
Microwave Antennas ◽  
Fresnel Region ◽  
Wide Range ◽  
Reduction Effect ◽  
Reference Parameters

A handy method of calculating far-field gain based on the magnitude of the power transmission in a Fresnel region is presented, which can be applied to the phaseless near-field measurement. Due to the short range inside an anechoic chamber, the probe antenna is often placed in the Fresnel region of the antenna under test (AUT). It is well-known that far-field gain of an antenna gradually reduces when one antenna moves to the other one placed in a proximity distance. This fact can be advantageously applied to estimate the far-field gain in a far-field region. The proposed method offers rapid estimation of the far-field gain based on the simple input knowledge such as the probe antenna gain and the magnitude of the power transmission and the separation distance between AUT and probe antenna. The proposed method can be applicable to a wide range of microwave antennas. This feature makes it possible to offer preliminary measurement results and reference parameters of the measurement for the various types of microwave antennas.

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.

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

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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