Dual Fano resonance control and refractive index sensors based on a plasmonic waveguide-coupled resonator system

Shi, Xiling; Ma, Lu‐Fang; Zhang, Zhidong; Tang, Youqi; Zhang, Yanjun; Han, Jianqiang; Sun, Yunqiang

doi:10.1016/j.optcom.2018.06.042

Cited by 60 publications

(26 citation statements)

References 36 publications

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“…We calculate reflectivity (R) and transmittance (T) in detail, and then define absorption rate A in terms of 1-T-R [54][55][56][57][58]. The simulation results of the unit units of the proposed nanostructure in the wavelength range of 900-3000 nm are shown in Figure 2a.…”

Section: Simulations Results and Discussionmentioning

confidence: 99%

A Tunable Triple-Band Near-Infrared Metamaterial Absorber Based on Au Nano-Cuboids Array

et al. 2020

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In this article, we present a design for a triple-band tunable metamaterial absorber with an Au nano-cuboids array, and undertake numerical research about its optical properties and local electromagnetic field enhancement. The proposed structure is investigated by the finite-difference time domain (FDTD) method, and we find that it has triple-band tunable perfect absorption peaks in the near infrared band (1000–2500 nm). We investigate some of structure parameters that influence the fields of surface plasmons (SP) resonances of the nano array structure. By adjusting the relevant structural parameters, we can accomplish the regulation of the surface plasmons resonance (SPR) peaks. In addition, the triple-band resonant wavelength of the absorber has good operational angle-polarization-tolerance. We believe that the excellent properties of our designed absorber have promising applications in plasma-enhanced photovoltaic, optical absorption switching and infrared modulator optical communication.

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Section: Simulations Results and Discussionmentioning

confidence: 99%

A Tunable Triple-Band Near-Infrared Metamaterial Absorber Based on Au Nano-Cuboids Array

et al. 2020

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“…The proposed monolayer graphene structure can be used to measure the refractive index of the metamaterial surface environment, and it has the advantages of narrow band width and large modulation depth. In the actual working environment, when the refractive index of the metamaterial of the local surface isoexcimer resonance sensor changes with the incident wavelength, the light intensity can usually be measured [51][52][53][54][55][56][57]. Therefore, we propose the definitions of sensitivity (S) and figure of merit (FOM), so as to prove the sensor performance of the studied structure, as shown below [58][59][60][61][62][63][64][65][66][67][68]: Figure 6a shows that when the refractive index of the nearby medium changes from 1.00 to 1.10 (each change is 0.02), the wavelength of the resonance peak shifts red.…”

Section: Resultsmentioning

confidence: 99%

High Quality Factor, High Sensitivity Metamaterial Graphene—Perfect Absorber Based on Critical Coupling Theory and Impedance Matching

et al. 2020

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By means of critical coupling and impedance matching theory, we have numerically simulated the perfect absorption of monolayer graphene. Through the critical coupling effect and impedance matching, we studied a perfect single-band absorption of the monolayer graphene and obtained high quality factor (Q-factor = 664.2) absorption spectrum which has an absorbance close to 100% in the near infrared region. The position of the absorption spectrum can be adjusted by changing the ratio between the radii of the elliptic cylinder air hole and the structural period. The sensitivity of the absorber can be achieved S = 342.7 nm/RIU (RIU is the per refractive index unit) and FOM = 199.2 (FOM is the figure of merit), which has great potential for development on biosensors. We believe that our research will have good application prospects in graphene photonic devices and optoelectronic devices.

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“…Obviously, a structure with only one resonant mode is hardly to have satisfactory effect in practical applications [20,22]. Therefore, the structures which can excited multimode resonances are proposed [23]. So far as is known, increasing the number of transmission peaks can effectively improve the accuracy and the fault tolerance of the structure.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Nanosensor Based on Independently Tunable Multiple Fano Resonances

Cheng¹,

Wang²,

He³

et al. 2019

Preprint

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A novel refractive index nanosensor with compound structures is proposed in this paper. It consists of three different kinds of resonators and two stubs which are side-coupled to a metal-dielectric-metal (MDM) waveguide. By utilizing numerical investigation with the finite element method (FEM), the simulation results show that the transmission spectrum of the nanosensor has as much as five sharp peaks of Fano resonance. Due to their different resonance mechanisms, each peak of resonances can be independently tuned by adjusting the corresponding parameters of the structure. In addition, the sensitivity of the nanosensor is up to , and it also has an excellent performance with a high group refractive index of . For the sake of different functions to practical applications, a legitimate combination of various different components, such as T-shaped, ring, and split-ring cavities, has been proposed to make the nanosensor dramatically reduce its dimensions without sacrificing performance. These designing concepts pave a new way to construct such compact on-chip plasmonic structures, and it can be widely applied to nanosensors, optical splitters, filters, optical switches, nonlinear photonic and slow-light devices.

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Dual Fano resonance control and refractive index sensors based on a plasmonic waveguide-coupled resonator system

Cited by 60 publications

References 36 publications

A Tunable Triple-Band Near-Infrared Metamaterial Absorber Based on Au Nano-Cuboids Array

A Tunable Triple-Band Near-Infrared Metamaterial Absorber Based on Au Nano-Cuboids Array

High Quality Factor, High Sensitivity Metamaterial Graphene—Perfect Absorber Based on Critical Coupling Theory and Impedance Matching

Plasmonic Nanosensor Based on Independently Tunable Multiple Fano Resonances

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