scholarly journals Dual-Fano resonances and sensing properties in the crossed ring-shaped metasurface

2020 ◽  
Author(s):  
Zhihui He ◽  
Chunjiang Li ◽  
Wei Cui ◽  
Weiwei Xue ◽  
Zhenxiong Li ◽  
...  
Keyword(s):  
Fano Resonance ◽  
Incident Light ◽  
Ring Structure ◽  
Circular Ring ◽  
Resonance Peak ◽  
Fdtd Simulation ◽  
Fano Resonances ◽  
Surface Plasmon Resonances ◽  
Sensing Properties ◽  
Plasmonic Sensors

Abstract We study dual-Fano resonances and its sensing properties in a crossed ring-shaped metasurface by use of the finite-different time-domain (FDTD) simulation. The results show that the dual-Fano resonances in the proposed crossed ring-shaped metasurface are caused by the interaction among three local surface plasmon resonances (LSPRs), and the spectra of dual-Fano resonances can be tuned by the radius of the circular ring (CR) nanostructure, the distance between the center of the two CRs in x direction, and the polarization of the incident light. Interestingly, single Fano resonance splits into dual-Fano resonances in the case of asymmetric ring structure arrangement or non-y-axis polarized incident or the distance d<120 nm. Moreover, we can also find that the refractive sensitivity in the proposed crossed ring-shaped metasurface can reach up to 1010 nm/RIU and 1300 nm/RIU at Fano resonance peak 1 and Fano resonance peak 2, respectively. These results may play an important role for designing high sensitive plasmonic sensors.

scholarly journals Tunable Fano Resonance and Enhanced Sensing in a Simple Au/TiO2 Hybrid Metasurface

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 687 ◽  
Author(s):  
Zhihui He ◽  
Weiwei Xue ◽  
Wei Cui ◽  
Chunjiang Li ◽  
Zhenxiong Li ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Fano Resonance ◽  
Fdtd Simulation ◽  
Fano Resonances ◽  
Local Surface ◽  
Surface Plasmon Resonances ◽  
Coupled Mode ◽  
Plasmon Resonances ◽  
Refractive Index Sensors ◽  
Plasmon Polaritons

We investigate Fano resonances and sensing enhancements in a simple Au/TiO2 hybrid metasurface through the finite-different time-domain (FDTD) simulation and coupled mode theory (CMT) analysis. The results show that the Fano resonance in the proposed simple metasurface is caused by the destructive interaction between the surface plasmon polaritons (SPPs) and the local surface plasmon resonances (LSPRs), the quality factor and dephasing time for the Fano resonance can be effectively tuned by the thickness of Au and TiO2 structures, the length of each unit in x and y directions, as well as the structural defect. In particular, single Fano resonance splits into multiple Fano resonances caused by a stub-shaped defect, and multiple Fano resonances can be tuned by the size and position of the stub-shaped defect. Moreover, we also find that the sensitivity in the Au/TiO2 hybrid metasurface with the stub-shaped defect can reach up to 330 nm/RIU and 535 nm/RIU at the Fano resonance 1 and Fano resonance 2, which is more than three times as sensitive in the Au/TiO2 hybrid metasurface without the stub-shaped defect, and also higher than that in the TiO2 metasurface reported before. These results may provide further understanding of Fano resonances and guidance for designing ultra-high sensitive refractive index sensors.

scholarly journals Tuning the Fano Resonance Between Localized and Propagating Surface Plasmon Resonances for Refractive Index Sensing Applications

Plasmonics ◽  
2013 ◽  
Vol 8 (3) ◽  
pp. 1379-1385 ◽  
Author(s):  
Kristof Lodewijks ◽  
Jef Ryken ◽  
Willem Van Roy ◽  
Gustaaf Borghs ◽  
Liesbet Lagae ◽  
...  
Keyword(s):  
Refractive Index ◽  
Surface Plasmon ◽  
Fano Resonance ◽  
Surface Plasmon Resonances ◽  
Refractive Index Sensing ◽  
Sensing Applications ◽  
Plasmon Resonances

Fano Resonance and Sensing Properties of Gold-silver Nanorod Heterodimers

2018 ◽  
Vol 24 (3) ◽  
pp. 326-332
Author(s):  
陈凌霄 CHEN Ling-xiao ◽  
苏佳 SU Jia ◽  
秦梦瑶 QIN Meng-yao ◽  
马强 MA Qiang ◽  
潘诚达 PAN Cheng-da ◽  
...  
Keyword(s):  
Fano Resonance ◽  
Sensing Properties ◽  
Gold Silver

scholarly journals Numerical Study of Multilayer Planar Film Structures for Ideal Absorption in the Entire Solar Spectrum

2020 ◽  
Vol 10 (9) ◽  
pp. 3276 ◽  
Author(s):  
Wei Chen ◽  
Jing Liu ◽  
Wen-Zhuang Ma ◽  
Gao-Xiang Yu ◽  
Jing-Qian Chen ◽  
...  
Keyword(s):  
Noble Metals ◽  
Numerical Study ◽  
Incident Light ◽  
Solar Spectrum ◽  
Fdtd Simulation ◽  
Polarization Angle ◽  
Solar Absorber ◽  
Solar Energy Harvesting ◽  
Planar Film ◽  
Planar Films

Here, we have theoretically proposed an ideal structure of selective solar absorber with multilayer planar films, which can absorb the incident light throughout the entire solar spectrum (300–2500 nm) and over a wide angular range, whatever the polarization angle of 0°~90°. The efficiency of the proposed absorber is proven by the Finite-Difference Time Domain (FDTD) simulation. The average absorption rate over the solar spectrum is up to 96.6%. The planar design is extremely easy to fabricate and modify, and this structure does not require lithographic processes to finish the absorbers. Improvements of the solar absorber on the basis of planar multilayer-film structures is attributed to multiple asymmetric highly lossy Fabry–Perot resonators. Because of having many virtues, such as using different refractory and non-noble metals, having angle and polarization independence, and having ideal absorption for entire solar spectrum, our proposed absorbers are promising candidates for practical industrial production of the solar-energy harvesting.

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.

POLARIZATION-INDEPENDENT METAMATERIAL ABSORBER FOR SINGLE BAND AND MULTI-BAND FREQUENCY

2015 ◽  
Vol 77 (10) ◽  
Author(s):  
Osman Ayop ◽  
Mohamad Kamal A. Rahim ◽  
Noor Asniza Murad
Keyword(s):  
Ring Structure ◽  
Circular Ring ◽  
Unit Cell ◽  
Single Band ◽  
Frequency Separation ◽  
Dual Band ◽  
Band Frequency ◽  
Ring Shape ◽  
Polarization Independent ◽  
Multi Band

This paper presents the design and simulation of polarization-independent type of metamaterial absorbers (MMAbs) at X-band frequency. The advantage of polarization-independent MMAbs is it can absorbs incident electromagnetic (EM) wave in all polarization states. It can be achieved by applying circular ring shape in a unit cell of MMAbs because the shape is very symmetry. The simulation is done in a unit cell for each proposed MMAbs structures. The FR4 substrate is used for MMAbs structure designs. The designed MMAbs structures can be divided into two parts which is circular ring and modified circular ring. The characteristics of both structure are studied through simulation process using CST software. Parametric study is conducted to observe the effect of each parameters in unit cell on the absorbing magnitude and frequency. It is observed that circular ring structures can achieve high EM wave  absorbance for single band and multi band frequency. Since frequency separation distant limitation occurred, the modified circular ring structure is proposed by adding copper lines on the original circular ring structure. Thus, dual band frequency with close separation distant between two resonant frequencies is obtained as close as 1 GHz compared to the original dual band circular ring which is 2 GHz.

Modal Orthogonality Applied to Design of Spatially Shaped Distributed Sensors

1992 ◽  
Author(s):  
H. S. Tzou ◽  
M. Natori ◽  
J. P. Zhong
Keyword(s):  
Structural Instability ◽  
Ring Structure ◽  
Circular Ring ◽  
Structural Systems ◽  
Orthogonal Functions ◽  
Distributed Sensors ◽  
Distributed Sensor ◽  
Spatially Distributed ◽  
Sensor Signals ◽  
Observation Spillover

Abstract Observation spillover resulting from sensing signals often introduces structural instability of undamped structural systems. One method to prevent the spillover problem is to use spatially distributed modal sensors in which the effects of residual modes are filtered out. In this study, a modal filtering theory for a generic shell continuum, based on modal orthogonal functions, is derived. The sensor signals are contributed from membrane strains and bending strains of the piezoelectric distributed sensor on the shell continua. This theory is applied to a design of cosine shaped convolving sensors for a circular ring structure. Performance of the distributed convolving sensors is studied. Bending and membrane (circumferential) sensitivities of the convolving ring sensors are defined.

scholarly journals Near-infrared dual-wavelength plasmonic switching and digital metasurface unveiled by plasmonic Fano resonance

Nanophotonics ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 947-957
Author(s):  
Jie Ou ◽  
Xiao-Qing Luo ◽  
You-Lin Luo ◽  
Wei-Hua Zhu ◽  
Zhi-Yong Chen ◽  
...  
Keyword(s):  
Optical Communication ◽  
Fano Resonance ◽  
Information Transfer ◽  
Near Infrared ◽  
Induce Polarization ◽  
Circular Ring ◽  
Dual Wavelength ◽  
Unit Cells ◽  
Potential Applications ◽  
Transmitted Spectrum

AbstractPlasmonic Fano resonance (FR) that contributes to multitudinous potential applications in subwavelength nanostructures can facilitate the realization of tunable wavelength selectivity for controlling light–matter interactions in metasurfaces. However, the plasmonic FR can be generated in metasurfaces with simple or complex geometries, and few of them can support flexible amplitude modulation and multiwavelength information transfer and processing. Here, we study the near-infrared plasmonic FR in a hybrid metasurface composed of concentrically hybridized parabolic-hole and circular-ring-aperture unit cells, which can induce polarization-dependent dual-wavelength passive plasmonic switching (PPS) and digital metasurface (DM). It is shown that the designable plasmonic FR can be realized by changing the geometric configurations of the unit cells. In particular, owing to the polarization-dependent characteristic of FR, it is possible to fulfill a compact dual-wavelength PPS with high ON/OFF ratios in the related optical communication bands. Moreover, such PPS that manipulates the amplitude response of the transmitted spectrum is an efficient way to reveal a 1-bit DM, which can also be rationally extended to a 2-bit DM or more. Our results suggest a pathway for studying polarization-dependent PPS and programmable metasurface devices, yielding possibilities for subwavelength nanostructures in optical communication and information processing.

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