scholarly journals Impact of the Interband Transitions in Gold and Silver on the Dynamics of Propagating and Localized Surface Plasmons

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1411
Author(s):  
Krystyna Kolwas ◽  
Anastasiya Derkachova
Keyword(s):  
Surface Plasmons ◽  
Dielectric Function ◽  
Surface Plasmon ◽  
Interband Transition ◽  
Electromagnetic Spectrum ◽  
Localized Surface Plasmons ◽  
Interband Transitions ◽  
Quality Factors ◽  
Frequency Dependent ◽  
Spectral Ranges

Understanding and modeling of a surface-plasmon phenomenon on lossy metals interfaces based on simplified models of dielectric function lead to problems when confronted with reality. For a realistic description of lossy metals, such as gold and silver, in the optical range of the electromagnetic spectrum and in the adjacent spectral ranges it is necessary to account not only for ohmic losses but also for the radiative losses resulting from the frequency-dependent interband transitions. We give a detailed analysis of Surface Plasmon Polaritons (SPPs) and Localized Surface Plasmons (LPSs) supported by such realistic metal/dielectric interfaces based on the dispersion relations both for flat and spherical gold and silver interfaces in the extended frequency and nanoparticle size ranges. The study reveals the region of anomalous dispersion for a silver flat interface in the near UV spectral range and high-quality factors for larger nanoparticles. We show that the frequency-dependent interband transition accounted in the dielectric function in a way allowing reproducing well the experimentally measured indexes of refraction does exert the pronounced impact not only on the properties of SPP and LSP for gold interfaces but also, with the weaker but not negligible impact, on the corresponding silver interfaces in the optical ranges and the adjacent spectral ranges.

scholarly journals Localized Surface Plasmon Fields Manipulation on Nanostructures Using Wavelength Shifting

2021 ◽  
Vol 11 (19) ◽  
pp. 9133
Author(s):  
Hyerin Song ◽  
Heesang Ahn ◽  
Taeyeon Kim ◽  
Jong-ryul Choi ◽  
Kyujung Kim
Keyword(s):  
Surface Plasmons ◽  
Light Source ◽  
Surface Plasmon ◽  
Localized Surface Plasmon ◽  
Localized Surface Plasmons ◽  
Swept Source ◽  
Field Distributions ◽  
Different Types ◽  
Field Localization ◽  
Rod Array

Metallic nanowires have been utilized as a platform for propagating surface plasmon (SPs) fields. To be exploited for applications such as plasmonic circuits, manipulation of localized field propagating pattern is also important. In this study, we calculated the field distributions of localized surface plasmons (LSPs) on the specifically shaped nanostructures and explored the feasibility of manipulating LSP fields. Specifically, plasmonic fields were calculated at different wavelengths for a nanoscale rod array (I-shaped), an array connected with two nanoscale rods at right angles (T-shaped), and an array with three nanoscale rods at 120° to each other (Y-shaped). Three different types of nanostructures are suggested to manipulate the positions of LSP fields collaborating with adjustment of wavelength, polarization, and incident orientation of light source. The results of this study are important not only for the understanding of the wavelength-dependent surface plasmon field localization mechanism but also for the applicability of swept source-based plasmonic techniques or designing a plasmonic circuit.

SIZE DEPENDENCE OF INTERBAND TRANSITIONS IN Al NANOPARTICLE

2011 ◽  
Vol 25 (25) ◽  
pp. 3361-3369
Author(s):  
YAJING PENG ◽  
XUEFEI YIN ◽  
WEIQIANG DING
Keyword(s):  
Size Effect ◽  
Dielectric Function ◽  
Linear Relation ◽  
Size Dependence ◽  
Interband Transition ◽  
Important Application ◽  
Laser Ignition ◽  
Interband Transitions ◽  
Nanoenergetic Materials ◽  
Nm Range

The interband transition onset frequency of nanoaluminum is found to approximately, linearly decrease as reducing aluminum diameter in the 25–100 nm range. This linear relation is indicated to originate mostly from increased inner strain of nanoparticle caused by the small size effect. This relation realizes to introduce the size dependence of interband transitions into the metallic dielectric function and has its important application in the laser ignition of nanoenergetic materials.

A near-transparent 90∘ polarization rotator with an array of L-shaped holes inside a glass cube

2016 ◽  
Vol 30 (20) ◽  
pp. 1650259 ◽  
Author(s):  
Yan-Lin Liao ◽  
Yan Zhao ◽  
He-Ping Lu
Keyword(s):  
Surface Plasmons ◽  
Surface Plasmon ◽  
Single Layer ◽  
Destructive Interference ◽  
Localized Surface Plasmons ◽  
Cross Polarization ◽  
Polarization Rotation ◽  
Polarization Rotator ◽  
Plasmon Polaritons ◽  
Polarization Rotators

We report a near-transparent 90[Formula: see text] polarization rotator by using a single-layer microstructure. The co-polarization light has been suppressed by using destructive interference. At the same time, the transmission of cross-polarization light has been improved with inference effect between surface plasmon polaritons (SPPs) and localized surface plasmons (LSPs). This efficient polarization rotation mechanism may be very useful in designing polarization rotators.

scholarly journals Copper–gold sandwich structures on PE and PET and their SERS enhancement effect

RSC Advances ◽  
2017 ◽  
Vol 7 (37) ◽  
pp. 23055-23064 ◽  
Author(s):  
Alena Reznickova ◽  
Petr Slepicka ◽  
Hoang Yen Nguyenova ◽  
Zdenka Kolska ◽  
Marcela Dendisova ◽  
...  
Keyword(s):  
Surface Plasmons ◽  
Surface Plasmon ◽  
Copper Nanoparticles ◽  
Surface Plasmon Polaritons ◽  
Sandwich Structures ◽  
Enhancement Effect ◽  
Localized Surface Plasmons ◽  
Sers Enhancement ◽  
Copper Gold ◽  
Plasmon Polaritons

In this paper we have investigated the SERS effect of gold–copper sandwich structures i.e. the coupling between surface plasmon polaritons supported by the gold grating and localized surface plasmons excited on the grafted copper nanoparticles.

Optical Interaction in a Plasmonic Metallic Nanoparticle Chain Coupled to a Metallic Film

2012 ◽  
Vol 534 ◽  
pp. 46-50
Author(s):  
De Wen Zhao ◽  
Song Gang ◽  
Zhi Wei Wei ◽  
Li Yu
Keyword(s):  
Surface Plasmons ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Metallic Film ◽  
Localized Surface Plasmons ◽  
Metallic Nanoparticle ◽  
Thin Metallic Film ◽  
Metallic Particles ◽  
Particle Chain ◽  
Plasmon Polaritons

We demonstrated the coupling of localized surface plasmons and surface plasmon polaritons modes in a system composed of a metallic particle chain separated from a thin metallic film. The results showed that: (1) the thickness of the metallic particles buried in the dielectric space, (2) the positions of the particles influence the level of interaction between localized surface plasmons and surface plasmon polaritons modes. Meanwhile, the positions of the particles and the thickness of the metallic particles control the electromagnetic enhancement and influence the electric field distributions in this system. This kind of system has a very promising candidate for biosensing and surface enhanced spectroscopy applications.

Spoof surface plasmon polaritons supported by ultrathin corrugated metal strip and their applications

2015 ◽  
Vol 4 (3) ◽  
Author(s):  
Xi Gao ◽  
Tie Jun Cui
Keyword(s):  
Surface Plasmons ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
High Performance ◽  
Localized Surface Plasmons ◽  
Full Wave ◽  
Plasmonic Metamaterials ◽  
Corrugated Metal ◽  
Plasmon Polaritons ◽  
Spoof Surface Plasmon Polaritons

AbstractIn this review, we present a brief introduction on the spoof surface plasmons supported on corrugated metallic plates with nearly zero thickness. We mainly focus on the propagation characteristics of spoof surface plasmon polaritons (SPPs), excitation of planar SPPs, and several plasmonic devices including the bending waveguide, Y-shaped beam splitter, frequency splitter, and filter. These devices are designed and fabricated with either planar or conformal plasmonic metamaterials, which are validated by both full-wave simulations and experiments, showing high performance. We also demonstrate that an ultrathin textured metallic disk can support multipolar spoof localized surface plasmons, either with straight or curved grooves, from which the Fano resonances are also observed.

Sign in / Sign up

Export Citation Format

Share Document