scholarly journals Multiple Fano Resonances with Tunable Electromagnetic Properties in Graphene Plasmonic Metamolecules

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 236 ◽  
Author(s):  
Hengjie Zhou ◽  
Shaojian Su ◽  
Weibin Qiu ◽  
Zeyang Zhao ◽  
Zhili Lin ◽  
...  
Keyword(s):  
Single Molecule ◽  
Modulation Depth ◽  
Extinction Spectrum ◽  
Electromagnetic Properties ◽  
Geometrical Parameters ◽  
Fano Resonances ◽  
Metal Structures ◽  
Resonance Modes ◽  
Damping Rate ◽  
Radical Distribution

Multiple Fano resonances (FRs) can be produced by destroying the symmetry of structure or adding additional nanoparticles without changing the spatial symmetry, which has been proved in noble metal structures. However, due to the disadvantages of low modulation depth, large damping rate, and broadband spectral responses, many resonance applications are limited. In this research paper, we propose a graphene plasmonic metamolecule (PMM) by adding an additional 12 nanodiscs around a graphene heptamer, where two Fano resonance modes with different wavelengths are observed in the extinction spectrum. The competition between the two FRs as well as the modulation depth of each FR is investigated by varying the materials and the geometrical parameters of the nanostructure. A simple trimer model, which emulates the radical distribution of the PMM, is employed to understand the electromagnetic field behaviors during the variation of the parameters. Our proposed graphene nanostructures might find significant applications in the fields of single molecule detection, chemical or biochemical sensing, and nanoantenna.

RHOMBIC SILVER NANOPARTICLES ARRAY-BASED PLASMONIC FILTER

2011 ◽  
Vol 25 (19) ◽  
pp. 2557-2566 ◽  
Author(s):  
YONGQI FU ◽  
SHAOLI ZHU ◽  
XIULI ZHOU ◽  
WEI ZHOU ◽  
WEI ZHAO
Keyword(s):  
Filter Design ◽  
Extinction Spectrum ◽  
Dipole Approximation ◽  
Design Parameters ◽  
Geometrical Parameters ◽  
Theoretical Spectrum ◽  
Nanoparticle Array ◽  
Ag Nanoparticle ◽  
Design And Optimization ◽  
Plasmonic Filter

A plasmonic filter applied in visible regime is proposed. A method using discrete dipole approximation (DDA) to aid design parameters of rhombic Ag nanoparticle array is adopted for the filter design and optimization on the basis of computational numerical calculation. Influence of the particle parameters such as thickness, period and effective index of medium around the particles on the extinction spectrum is studied using the DDA-based computational analysis. The calculation results show that the thickness ranging from 35 to 45 nm and the period ranging from 350 to 560 nm are the better geometrical parameters of the rhombic Ag nanoparticle array. Considering the nano-fabrication condition, 40 nm thickness and 440 nm period were selected and fabricated using nanosphere lithography (NSL) technique. The experimental results demonstrated that the measured spectrum is basically in agreement with the theoretical spectrum derived by the DDA calculation.

scholarly journals Comparative Study of Surface Interaction and Excitation

2017 ◽  
Vol 9 (01) ◽  
pp. 73-75
Author(s):  
Abhishek Tiwari
Keyword(s):  
Carbon Nanotube ◽  
Surface Plasmons ◽  
Single Molecule ◽  
Propagation Constant ◽  
Resonant Interaction ◽  
Dielectric Medium ◽  
Nano Particles ◽  
Electromagnetic Properties ◽  
Biomedical Sciences ◽  
Surface Enhanced Raman

Extensive research has found nano-particles, for many years subject of unanimous concern because of their anomalous electromagnetic properties originating from the resonant interaction between light and collective conduction electron oscillations so called surface Plasmons. These properties in particular local electric field enhancements enable applications such as single molecule detection using surface enhanced Raman scattering and the synthesis of composite materials exhibiting an enhanced nonlinear optical response. Since all these applications rely on the resonant behavior of localized surface Plasmons, they are restricted to a limited frequency range determined by the dielectric function of the involved media, the size and shape of the particles and the electromagnetic interaction between them. Thus those properties of the Plasmons and Polaritons on the Carbon Nanotube have been studied in different size with help of theoretical study. The surface frequency of Plasmon varies with propagation constant on the surface of Carbon Nanotube when it is placed in dielectric medium, so this new property of Carbon Nanotube have been seen in other dielectric medium. This property of surface Plasmon can be used in telecommunication, satellite media, biomedical sciences etc.

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 Optimization Based on the Surface Plasmon Optical Properties of Adjustable Metal Nano-Microcavity System for Biosensing

2021 ◽  
Vol 9 ◽  
Author(s):  
Jin Zhu ◽  
Yiye Yang ◽  
Yanping Yin ◽  
Huining Yuan
Keyword(s):  
Optical Properties ◽  
Electric Field ◽  
Gold Film ◽  
Incident Light ◽  
Extinction Spectrum ◽  
High Sensitivity ◽  
Element Analysis ◽  
Environmental Media ◽  
Resonance Modes ◽  
High Concentrations

This paper mainly studies the plasma optical properties of the silver nanorod and gold film system with gap structure. During the experiment, the finite element analysis method and COMSOL Multiphysics are used for modeling and simulation. The study changes the thickness of the PE spacer layer between the silver nanorod and the gold film, the conditions of the incident light and the surrounding environment medium. Due to the anisotropic characteristics of silver nanorod, the microcavity system is extremely sensitive to the changes of internal and external conditions, and the system exhibits strong performance along the long axis of the nanorod. By analyzing the extinction spectrum of the nanoparticle and the electric field section diagrams at resonance peak, it is found that the plasma optical properties of the system greatly depend on the gap distance, and the surrounding electric field of the silver nanorod is confined in the gap. Both ends of the nanorod and the gap are distributed with high concentrations of hot spots, which reflects the strong hybridization of multiple resonance modes. Under certain excitation conditions, the plasma hybridization behavior will produce a multi-pole mode, and the surface electric field distribution of the nanorod reflects the spatial directionality. In addition, the system is also highly sensitive to the environmental media, which will cause significant changes in its optical properties. The plasma microcavity system with silver nanorod and gold film studied in this paper can be used to develop high-sensitivity biosensors, which has great value in the field of biomedical detection.

scholarly journals A Plasmonic Structure of Fano Resonance in the MIM Waveguide with r-Shaped Resonator for Refractive Index Sensor

2022 ◽  
Author(s):  
Siti Rohimah ◽  
He Tian ◽  
Jinfang Wang ◽  
Jianfeng Chen ◽  
Jina Li ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Refractive Index ◽  
Fano Resonance ◽  
Geometrical Parameters ◽  
Fano Resonances ◽  
The Finite Element Method ◽  
Plasmonic Structure ◽  
Mim Waveguide ◽  
Element Method

Abstract A plasmonic structure of metal-insulator-metal (MIM) waveguide consisting of a single baffle waveguide and an r-shaped resonator is designed to produce Fano resonance. The finite element method uses the finite element method to analyze the transmission characteristics and magnetic field distributions of the plasmonic waveguide distributions. The simulation results exhibit two Fano resonances that can be achieved by the interference between a continuum state in the baffle waveguide and a discrete state in the r-shaped resonator. The Fano resonances can be simply tuned by changing geometrical parameters of the plasmonic structure. The value variations of geometrical parameters have different effects on sensitivity. Thus, the sensitivity of the plasmonic structure can achieve 1333 nm/RIU, with a figure of merit of 5876. The results of the designed plasmonic structure offer high sensitivity and nano-scale integration, which are beneficial to refractive index sensors, photonic devices at the chip nano-sensors, and biosensors applications.

scholarly journals Fano resonances in the corrugated disk resonator and their applications

2020 ◽  
Vol 13 (4) ◽  
pp. 119-134
Author(s):  
Lin Chen ◽  
Bo Liu ◽  
Yiming Zhu
Keyword(s):  
Fano Resonance ◽  
Hybrid Structure ◽  
Plasmonic Waveguide ◽  
Metal Particles ◽  
Fano Resonances ◽  
Disk Resonator ◽  
Resonance Modes ◽  
Shed Light ◽  
The Way

We have experimentally excited terahertz multipolar Fano resonances in two asymmetrical metal particles: a defective corrugated metallic disk(CMD) structure and a hybrid structure consisted of a C-shaped resonator and a CMD. Furthermore, the Fano resonance modes can also be excited by the interaction between plasmonic waveguide and CMD. Our findings have shed light into the terahertz multipolar Fano resonances in asymmetrical CMD and opened the way to the design of terahertz plasmonic devices.

scholarly journals Reconfigurable Mach–Zehnder interferometer for dynamic modulations of spoof surface plasmon polaritons

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wen Yi Cui ◽  
Jingjing Zhang ◽  
Xinxin Gao ◽  
Tie Jun Cui
Keyword(s):  
Surface Plasmon ◽  
Amplitude Modulation ◽  
Modulation Depth ◽  
Zehnder Interferometer ◽  
Geometrical Parameters ◽  
Varactor Diodes ◽  
Unit Cells ◽  
Shift Keying ◽  
Dynamic Frequency ◽  
Mach Zehnder Interferometer

Abstract We propose an ultrathin reconfigurable Mach–Zehnder interferometer (MZI) for realizing dynamic frequency and amplitude modulations of spoof surface plasmon (SSP) signal. Active varactor diodes are integrated in the SSP unit cells on one of the MZI arms to introduce asymmetry to the MZI structure, which can control the interference patterns by varying bias voltages applied on the varactor diodes. We show that the spectral positions of multiple sharp interference dips are very sensitive to the change of diode capacitance, thereby allowing for good frequency modulation. We also demonstrate continuous amplitude modulation by tuning the varactor diodes at multiple selected frequencies. To verify the reconfigurable feature of the proposed SSP MZI, the frequency shift keying (FSK) and amplitude modulations have been experimentally demonstrated on the same structure. The modulation depth of the amplitude modulation can be further improved by designing geometrical parameters of the SSP structure, reaching a significant amplitude change from 0.88 to 0.05 in experiments.

Ultrafast optical switching based on mutually enhanced resonance modes in gold nanowire gratings

Nanoscale ◽  
2019 ◽  
Vol 11 (38) ◽  
pp. 17807-17814 ◽  
Author(s):  
Yan Wang ◽  
Xinping Zhang
Keyword(s):  
Optical Switching ◽  
Modulation Depth ◽  
Optical Switch ◽  
Gold Nanowires ◽  
Gold Nanowire ◽  
Ultrafast Optical ◽  
Resonance Modes ◽  
Thick Gold

An optical switch as fast as 290 fs using thick gold nanowires to achieve a modulation depth of >16%.

scholarly journals Novel nano-plasmonic sensing platform based on vertical conductive bridge

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hyo-Seung Park ◽  
Jongkil Park ◽  
Joon Young Kwak ◽  
Gyu-Weon Hwang ◽  
Doo-Seok Jeong ◽  
...  
Keyword(s):  
Electric Field ◽  
Incident Light ◽  
Geometrical Parameters ◽  
Theoretical Simulation ◽  
Resonance Modes ◽  
High Tunability ◽  
Fluid Analysis ◽  
Plasmonic Sensing ◽  
Sensing Platform ◽  
Conductive Bridge

AbstractA novel nano-plasmonic sensing platform based on vertical conductive bridge was suggested as an alternative geometry for taking full advantages of unique properties of conductive junction while substantially alleviating burdens in lithographic process. The effects of various geometrical parameters on the plasmonic properties were systematically investigated. Theoretical simulation on this structure demonstrates that the presence of vertical conductive bridge with smaller diameter sandwiched between two adjacent thin nanodiscs excites a bridged mode very similar to the charge transfer plasmon and exhibits a remarkable enhancement in the extinction efficiency and the sensitivity when the electric field of incident light is parallel to the conductive bridge. Furthermore, for the electric field perpendicular to the bridge, another interesting feature is observed that two magnetic resonance modes are excited symmetrically through open-gaps on both sides of the bridge together with strongly enhanced electric field intensity, which provides a very favorable environment as a surface enhanced Raman scattering substrate for fluid analysis. These results verify a great potential and versatility of our approach for use as a nanoplasmonic sensing platform. In addition, we demonstrated the feasibility of fabrication process of vertical conductive bridge and high tunability in controlling the bridge width.

Sign in / Sign up

Export Citation Format

Share Document