Optical Analysis of Hole Patterned Ag Nanoparticle Structure

2021 ◽  
Vol 21 (8) ◽  
pp. 4192-4199
Author(s):  
Hyun-Ji Jeon ◽  
Ji-Yeon Kim ◽  
Jinnil Choi
Keyword(s):  
Metal Nanoparticles ◽  
Optical Transmission ◽  
Incident Angle ◽  
Incident Light ◽  
Localized Surface Plasmon ◽  
Optical Analysis ◽  
Optical Noise ◽  
Hole Configuration ◽  
Nanoparticle Structure ◽  
Sub Wavelength

A structure with periodic sub-wavelength nanohole patterns interacts with incident light and causes extraordinary optical transmission (EOT), with metal nanoparticles leading to localized surface plasmon resonance (LSPR) phenomena. To explore the effects of metal nanoparticles (NPs), optical analysis is performed for metal NP layers with periodic hole patterns. Investigation of Ag NP arrangements and comparisons with metal film structures are presented. Ag NP structures with different hole configuration are explored. Also, the effects of increasing light incident angle are investigated for metal NP structures where EOT peak at 460 nm wavelength is observed. Moreover, electric field distributions at each transmittance peak wavelengths and optical noise are analyzed. As a result, optical characteristics of metal NP structures are obtained and differences in resonance at each wavelength are highlighted.

scholarly journals FDTD Modelling of Silver Nanoparticles Embedded in Phase Separation Interface of H-PDLC

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Kun Gui ◽  
Jihong Zheng ◽  
Kangni Wang ◽  
Daoping Li ◽  
Songlin Zhuang
Keyword(s):  
Silver Nanoparticles ◽  
Phase Separation ◽  
Incident Angle ◽  
Incident Light ◽  
Near Field ◽  
Double Resonance ◽  
Blue Shift ◽  
Resonance Peak ◽  
Localized Surface Plasmon ◽  
Silver Nps

We report localized surface plasmon resonance (LSPR) of silver nanoparticles (NPs) embedded in interface of phase separation of holographic polymer-dispersed liquid crystal (H-PDLC) gratings using Finite-Difference Time Domain method. We show that silver NPs exhibit double resonance peak at the interface, and these peaks are influenced by the angle of incident light. We observe a blue shift of the wavelength of resonance peak as the incident angle increases. However, the location of silver NPs at the interface has nearly no effect on the wavelength of resonance peak. Also we show near-field and far-field properties surrounding silver NPs and find that field distribution can be controlled through rotation of incident angle. Therefore, LSPR properties of silver NPs within H-PDLC gratings can be excited by appropriate wavelength and angle of the incident light.

Enhancement of Optical Transmission Through Planar Nano-Apertures in a Metal Film

2003 ◽  
Author(s):  
Eric X. Jin ◽  
Xianfan Xu
Keyword(s):  
Metal Film ◽  
Incident Light ◽  
Near Field ◽  
Transmission Efficiency ◽  
Localized Surface Plasmon ◽  
Fabry Perot ◽  
Wavelength Resolution ◽  
Signal Contrast ◽  
Negative Role ◽  
Sub Wavelength

In this work, we investigate transmission enhancement through ridged-apertures of nanometer size in a metal film in the optical frequency range. It is demonstrated that the fundamental propagation TE10 mode concentrated in the gap between the two ridges of the aperture provides transmission efficiency higher than unity, and the size of the gap between the two ridges determines the sub-wavelength resolution. Fabry-Perot-like resonance with respect to the thickness of the aperture and the red-shift phenomena with respect to the wavelength of the incident light are observed. As a comparison, transmission through regular apertures is also computed, and is found much lower. Localized surface plasmon (LSP) is excited on the edges of the aperture in a silver film but plays a negative role with respect to the field concentration and signal contrast. With optimized geometries, the ridged apertures are capable of achieving sub-wavelength resolution in the near field with transmission efficiency above unity and high contrast.

scholarly journals Broadband Near-Infrared Absorber Based on All Metallic Metasurface

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3568 ◽  
Author(s):  
Zhang ◽  
Deng ◽  
Song ◽  
Zhang
Keyword(s):  
Near Infrared ◽  
Thermal Emission ◽  
Incident Angle ◽  
Incident Light ◽  
Electron Transition ◽  
Normal Incidence ◽  
Localized Surface Plasmon ◽  
Metal Nanostructures ◽  
High Loss ◽  
High Absorption

Perfect broadband absorbers have increasingly been considered as important components for controllable thermal emission, energy harvesting, modulators, etc. However, perfect absorbers which can operate over a wide optical regime is still a big challenge to achieve. Here, we propose and numerically investigate a perfect broadband near-infrared absorber based on periodic array of four isosceles trapezoid prism (FITP) unit cell made of titanium (Ti) over a continuous silver film. The structure operates with low quality (Q) factor of the localized surface plasmon resonance (LSPR) because of the intrinsic high loss, which is the foundation of the broadband absorption. The high absorption of metal nanostructures mainly comes from the power loss caused by the continuous electron transition excited by the incident light inside the metal, and the resistance loss depends on the enhanced localized electric field caused by the FITP structure. Under normal incidence, the simulated absorption is over 90% in the spectrum ranging from 895 nm to 2269 nm. The absorber is polarization-independent at normal incidence, and has more than 80% high absorption persisting up to the incident angle of ~45° at TM polarization.

scholarly journals Extraordinary Optical Transmission by Hybrid Phonon–Plasmon Polaritons Using hBN Embedded in Plasmonic Nanoslits

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1567
Author(s):  
Shinpei Ogawa ◽  
Shoichiro Fukushima ◽  
Masaaki Shimatani
Keyword(s):  
Optical Transmission ◽  
Hexagonal Boron Nitride ◽  
Incident Angle ◽  
Optical Filters ◽  
Extraordinary Optical Transmission ◽  
Light Manipulation ◽  
Rigorous Coupled Wave Analysis ◽  
Fabry Perot ◽  
Hyperbolic Dispersion ◽  
Rigorous Coupled Wave

Hexagonal boron nitride (hBN) exhibits natural hyperbolic dispersion in the infrared (IR) wavelength spectrum. In particular, the hybridization of its hyperbolic phonon polaritons (HPPs) and surface plasmon resonances (SPRs) induced by metallic nanostructures is expected to serve as a new platform for novel light manipulation. In this study, the transmission properties of embedded hBN in metallic one-dimensional (1D) nanoslits were theoretically investigated using a rigorous coupled wave analysis method. Extraordinary optical transmission (EOT) was observed in the type-II Reststrahlen band, which was attributed to the hybridization of HPPs in hBN and SPRs in 1D nanoslits. The calculated electric field distributions indicated that the unique Fabry–Pérot-like resonance was induced by the hybridization of HPPs and SPRs in an embedded hBN cavity. The trajectory of the confined light was a zigzag owing to the hyperbolicity of hBN, and its resonance number depended primarily on the aspect ratio of the 1D nanoslit. Such an EOT is also independent of the slit width and incident angle of light. These findings can not only assist in the development of improved strategies for the extreme confinement of IR light but may also be applied to ultrathin optical filters, advanced photodetectors, and optical devices.

scholarly journals Ultra-high-Q resonances in plasmonic metasurfaces

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
M. Saad Bin-Alam ◽  
Orad Reshef ◽  
Yaryna Mamchur ◽  
M. Zahirul Alam ◽  
Graham Carlow ◽  
...  
Keyword(s):  
Incident Light ◽  
Reducing Power ◽  
Field Enhancement ◽  
Plasmonic Nanostructures ◽  
High Q ◽  
Alternative Material ◽  
Order Of Magnitude ◽  
Wavelength Scale ◽  
Strong Confinement ◽  
Sub Wavelength

AbstractPlasmonic nanostructures hold promise for the realization of ultra-thin sub-wavelength devices, reducing power operating thresholds and enabling nonlinear optical functionality in metasurfaces. However, this promise is substantially undercut by absorption introduced by resistive losses, causing the metasurface community to turn away from plasmonics in favour of alternative material platforms (e.g., dielectrics) that provide weaker field enhancement, but more tolerable losses. Here, we report a plasmonic metasurface with a quality-factor (Q-factor) of 2340 in the telecommunication C band by exploiting surface lattice resonances (SLRs), exceeding the record by an order of magnitude. Additionally, we show that SLRs retain many of the same benefits as localized plasmonic resonances, such as field enhancement and strong confinement of light along the metal surface. Our results demonstrate that SLRs provide an exciting and unexplored method to tailor incident light fields, and could pave the way to flexible wavelength-scale devices for any optical resonating application.

scholarly journals Extraordinary Optical Transmission through Single Sub-Wavelength Slot Nano Antennas

2019 ◽  
Vol 09 (07) ◽  
pp. 112-125
Author(s):  
Mohamed S. Fouad ◽  
Mohamed Nady ◽  
AbdelHamid AbdelMonem Shaalan
Keyword(s):  
Optical Transmission ◽  
Extraordinary Optical Transmission ◽  
Sub Wavelength ◽  
Nano Antennas

Prompting peroxidase-like activity of gold nanorod composites by localized surface plasmon resonance for fast colorimetric detection of prostate specific antigen

The Analyst ◽  
2018 ◽  
Vol 143 (20) ◽  
pp. 5038-5045 ◽  
Author(s):  
Fang Tan ◽  
Yan Yang ◽  
Xiaoxue Xie ◽  
Linqian Wang ◽  
Keqin Deng ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Incident Light ◽  
Colorimetric Detection ◽  
Specific Antigen ◽  
Localized Surface Plasmon ◽  
Surface Electrons ◽  
Localized Plasmon ◽  
Conductive Particles ◽  
Dielectric Environment

The localized plasmon oscillations produced by the interaction of incident light with surface electrons in the conductive particles depend on their composition, size, geometry and dielectric environment.

scholarly journals Collective excitation of plasmon-coupled Au-nanochain boosts photocatalytic hydrogen evolution of semiconductor

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Guiyang Yu ◽  
Jun Qian ◽  
Peng Zhang ◽  
Bo Zhang ◽  
Wenxiang Zhang ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Metal Nanoparticles ◽  
Hydrogen Evolution ◽  
Rational Design ◽  
Collective Excitation ◽  
Formation Rate ◽  
Building Blocks ◽  
Localized Surface Plasmon ◽  
Plasmonic Enhancement ◽  
Photocatalytic Hydrogen Evolution

Abstract Localized surface plasmon resonance (LSPR) offers a valuable opportunity to improve the efficiency of photocatalysts. However, plasmonic enhancement of photoconversion is still limited, as most of metal-semiconductor building blocks depend on LSPR contribution of isolated metal nanoparticles. In this contribution, the concept of collective excitation of embedded metal nanoparticles is demonstrated as an effective strategy to enhance the utilization of plasmonic energy. The contribution of Au-nanochain to the enhancement of photoconversion is 3.5 times increase in comparison with that of conventional isolated Au nanoparticles. Experimental characterization and theoretical simulation show that strongly coupled plasmonic nanostructure of Au-nanochain give rise to highly intensive electromagnetic field. The enhanced strength of electromagnetic field essentially boosts the formation rate of electron-hole pair in semiconductor, and ultimately improves photocatalytic hydrogen evolution activity of semiconductor photocatalysts. The concept of embedded coupled-metal nanostructure represents a promising strategy for the rational design of high-performance photocatalysts.

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