scholarly journals Tunable Multipolar Fano Resonances and Electric Field Enhancements in Au Ring-Disk Plasmonic Nanostructures

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1576 ◽  
Author(s):  
Rong Qiu ◽  
Hang Lin ◽  
Jing Huang ◽  
Cuiping Liang ◽  
Zao Yi
Keyword(s):  
Optical Switch ◽  
Structural Parameters ◽  
Tunable Filter ◽  
Light Extinction ◽  
Plasmonic Nanostructures ◽  
Fano Resonances ◽  
Strong Light ◽  
Resonance Modes ◽  
Field Distributions ◽  
Dark Resonance

We theoretically research the characteristics of tunable multipolar Fano resonances in novel-designed Au ring-disk plasmonic nanostructures. We systematically study some structural parameters that influence the multipolar Fano resonances of the nanostructures. Adjustment of the radius (R1 and R2) of the Au ring, the radius (R3) of the Au disk and the thickness (H) of the Au ring-disk can effectively adjust the multipolar Fano resonances. The complex field distributions excited by a Au ring-disk can produce dark resonance modes. At the frequency of the multipolar Fano resonances, strong localized field distributions can be obtained. The Fano resonances exhibit strong light-extinction properties in Au ring-disk nanostructures, which can be applied to an optical tunable filter and optical switch.

scholarly journals Nanostrip-Induced High Tunability Multipolar Fano Resonances in a Au Ring-Strip Nanosystem

Nanomaterials ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 568 ◽  
Author(s):  
Zao Yi ◽  
Xin Li ◽  
Xibin Xu ◽  
Xifang Chen ◽  
Xin Ye ◽  
...  
Keyword(s):  
Optical Switching ◽  
Fdtd Method ◽  
Tunable Filter ◽  
Light Extinction ◽  
Fano Resonances ◽  
Surface Plasmon Resonances ◽  
Strong Light ◽  
New Approach ◽  
High Tunability ◽  
Complex Electric Field

Surface plasmon resonances of a Au ring-strip nanosystem with tunable multipolar Fano resonances have been investigated based on the finite-difference time-domain (FDTD) method. Abundant plasmon properties of a Au ring-strip nanosystem can be obtained on the basis of the unique electronic properties of different geometry parameters. In our research models, these multipolar Fano resonances are induced and can be tuned independently by changing the geometry parameters of the Au ring-strip nanosystem. Complex electric field distributions excited by the Au ring-strip nanosystem provide possibility to form dark plasmonic modes. Multipolar Fano resonances display strong light extinction in the Au ring-strip nanosystem, which can offer a new approach for an optical tunable filter, optical switching, and advanced biosensing.

WDM four-fiber ring with add/drop acousto-optic tunable filter and 4×4 optical switch

2002 ◽  
Author(s):  
S. Hamada ◽  
K. Asahi ◽  
T. Hosoi ◽  
C. Nakaya ◽  
D. Uehara ◽  
...  
Keyword(s):  
Optical Switch ◽  
Tunable Filter ◽  
Fiber Ring

Design of Novel Sensitive Terahertz Biosensors Based on Graphene-Plasmonic Nanostructures

2021 ◽  
Author(s):  
Atefeh Chahkoutahi ◽  
Farzin Emami
Keyword(s):  
Structural Parameters ◽  
Absorption Peak ◽  
Plasmonic Nanostructures ◽  
Aluminum Layer ◽  
Absorption Factor ◽  
Peak Wavelength ◽  
Blood Samples ◽  
Chemical Potentials ◽  
Sensing Characteristics ◽  
Peak Value

Abstract In this paper, four different configurations of sensitive biosensors based on graphene-plasmonic combinations are designed and proposed. The nanostructures are made of graphene, SiO2, aluminum and gold layers on a silicon substrate. Graphene-ring shaped structures with diagonal strips in vertical and horizontal directions are considered in the structures which greatly affect the absorption characteristics (absorption peak value and wavelength). Aluminum layer is used in the structure to prevent the transmission of light throughout some layers and improving the absorption factor. To promote the functionality of the structures, effects of the structural parameters (R1 and R2) and chemical potentials (Ef1, Ef2, Ef3 and Ef4) on the absorption peak-wavelength and its value, are also studied. The four individual configurations with different layers and strip directions demonstrate distinct and different wavelength ranges; structure-1: 45-60 µm, structure-2: 50-70 µm, structure-3: 70-85 µm, and structure-4: 80-100 µm. Thus, they can be utilized for wide categories of applications. Sensitivities of 1500nm/RIU, 2250/RIU, 3750nm/RIU and 4850nm/RIU are obtained for four types, respectively. The proposed structures indicate more sensitivities and they can be used in acceptable sensing characteristics for different applications like hemoglobin and glucose concentrations in blood samples and can be utilized as refractive index bio-sensing sensors.

Localized surface plasmon resonance modes on an asymmetric cylindrical nanorod dimer

2016 ◽  
Vol 30 (22) ◽  
pp. 1650280 ◽  
Author(s):  
Rui-Bing Wang ◽  
Zhi-Dong Zhang ◽  
Guo-Tai Jiao ◽  
Chen-Yang Xue ◽  
Shu-Bin Yan ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Structural Parameters ◽  
Localized Surface Plasmon ◽  
Extinction Spectra ◽  
Resonance Modes ◽  
Nanorod Dimer ◽  
Bonding Mode

The extinction spectra and electric field distribution of an asymmetric cylindrical nanorod dimer (ACND) are calculated by discrete dipole approximation. The ACND is composed of two linear orders of cylindrical silver nanorods with different radii and lengths. The effects of the structural parameters of ACND on the localized surface plasmon resonance (LSPR) mode are also studied. Results show two resonance peaks in the extinction spectra of ACND: the higher-energy anti-bonding mode and the lower-energy bonding mode. The interaction of two hybridization plasmonic resonance modes produces an asymmetric line shape in the extinction spectra, which is considered to be a Fano resonance profile.

All-optical switch and tunable filter with photorefractive crystal

2008 ◽  
Author(s):  
Satoshi Honma ◽  
Naoya Tsuda ◽  
Atsushi Okamoto ◽  
Shinzo Muto
Keyword(s):  
Optical Switch ◽  
Tunable Filter ◽  
Photorefractive Crystal ◽  
All Optical ◽  
All Optical Switch

Reconfigurable radio-over-fiber system based on optical switch and tunable filter

2017 ◽  
Vol 56 (09) ◽  
pp. 1
Author(s):  
Xiao Li ◽  
Rui Yin ◽  
Wei Ji ◽  
Kai Sun ◽  
Shicheng Zhang
Keyword(s):  
Optical Switch ◽  
Tunable Filter ◽  
Radio Over Fiber ◽  
Fiber System ◽  
Reconfigurable Radio ◽  
Radio Over Fiber System

Narrow dark resonance modes in concentric ring/disk cavities

2015 ◽  
Vol 32 (9) ◽  
pp. 1979
Author(s):  
Yi Zhang ◽  
Xianbing Ming ◽  
Guifen Liu ◽  
Haiming Zhang ◽  
Tianqing Jia
Keyword(s):  
Concentric Ring ◽  
Resonance Modes ◽  
Dark Resonance

Resonance Modes of Tall Plasmonic Nanostructures and Their Applications for Biosensing

2020 ◽  
Vol 56 (2) ◽  
pp. 1-7
Author(s):  
Alana M. Soehartono ◽  
Landobasa Y. M. Tobing ◽  
Aaron D. Mueller ◽  
Ken-Tye Yong ◽  
Dao Hua Zhang
Keyword(s):  
Plasmonic Nanostructures ◽  
Resonance Modes

scholarly journals Graphene Multiple Fano Resonances Based on Asymmetric Hybrid Metamaterial

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2408
Author(s):  
Zhendong Yan ◽  
Zhixing Zhang ◽  
Wei Du ◽  
Wenjuan Wu ◽  
Taoping Hu ◽  
...  
Keyword(s):  
Structural Parameters ◽  
Resonant Mode ◽  
Split Ring Resonator ◽  
Graphene Nanoribbon ◽  
Fano Resonances ◽  
Dark Mode ◽  
Split Ring ◽  
Tunable Sensors ◽  
Asymmetric Hybrid ◽  
Hybrid Metamaterial

We theoretically investigate multiple Fano resonances in an asymmetric hybrid graphene–metal metamaterial. The multiple Fano resonances emerge from the coupling of the plasmonic narrow bonding and antibonding modes supported by an in-plane graphene nanoribbon dimer with the broad magnetic resonance mode supported by a gold split-ring resonator. It is found that the Fano resonant mode with its corresponding dark mode of the antibonding mode in the in-plane graphene nanoribbon dimer is only achieved by structural symmetry breaking. The multiple Fano resonances can be tailored by tuning the structural parameters and Fermi levels. Active control of the multiple Fano resonances enables the proposed metamaterial to be widely applied in optoelectronic devices such as tunable sensors, switches, and filters.

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