Surface modes in plasmonic stubbed structures

Rezzouk, Yamina; Amrani, Madiha; Khattou, Soufyane; Boudouti, El Houssaine El; Djafari‐Rouhani, Bahram

doi:10.1016/j.matpr.2021.03.438

Cited by 2 publications

(1 citation statement)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The FW-BICs were first proposed in quantum physics [34] and have since been extended to photonics [37] and plasmonics [38]. The most notable feature of BICs is the occurrence of high-quality quasi-BICs in the transmittance spectrum [39]. Further, the quasi-BIC emerges by tuning some parameters to make it slightly detuned from the critical coupling condition, so the otherwise localized BIC can couple with the incident wave [40].…”

Section: Introductionmentioning

confidence: 99%

Bound States in the Continuum and Induced Resonances in a Simple Plasmonic Waveguide with Sensing Application

Rezzouk,

Khattou,

Amrani

et al. 2023

Photonics

View full text Add to dashboard Cite

A Friedrich–Wintgen bound state in the continuum (FW-BIC) is of particular interest in the field of wave physics phenomena. It is induced via the destructive interference of two modes that belong to the same cavity. In this work, we analytically and numerically show the existence of FW-BIC in a T-shaped cavity composed of a stub of length d0 and two lateral branches of lengths d1 and d2, attached to an infinite waveguide. The whole system consists of metal–insulator–metal (MIM) plasmonic waveguides that operate in the telecommunication range. Theoretically, when d1 and d2 are commensurated, BIC is induced by these two branches. This latter is independent of d0 and the infinite waveguide, where the T structure is grafted. By breaking the BIC condition, we obtain a plasmon-induced transparency (PIT) resonance. The PIT resonance’s sensitivity to the dielectric material of the waveguide may be exploited to design a sensitive nanosensor suitable for sensing platforms, thanks to its very small footprint. A sensitivity of 1400 nm/RIU and a resolution of 1.86×10−2 RIU showed a high level of performance that the designed structure achieved. Moreover, this structure could also be used as a biosensor, in which we have studied the detection of the concentration in the human body, such as Na+, K+, and glucose solutions, and these sensitivities can reach 0.21, 0.28, and 1.74 nm dL/mg, respectively. Our designed structure advances with technology and has good application prospects, working as a biosensor to detect the blood’s hemoglobin level. The analytical results, obtained via Green’s function method, are validated via numerical simulations using Comsol Multiphysics software based on the finite element method.

show abstract

Section: Introductionmentioning

confidence: 99%

Bound States in the Continuum and Induced Resonances in a Simple Plasmonic Waveguide with Sensing Application

Rezzouk,

Khattou,

Amrani

et al. 2023

Photonics

View full text Add to dashboard Cite

show abstract

Plasmonic Tamm states in periodic stubbed MIM waveguides: analytical and numerical study

et al. 2022

View full text Add to dashboard Cite

We investigate both analytically and numerically the existence of localized surface modes, the so-called plasmonic Tamm states (PTSs), in a new and versatile platform based on a periodic array of metal-insulator-metal (MIM) stubs grafted along a MIM waveguide. By considering a semi-infinite structure in which we modify the length of the segment at the surface, we show the existence of surface states inside the bandgaps of the periodic structure and investigate the dependence of the localized modes as a function of the geometrical parameters and the boundary conditions applied at the surface. Three types of surface boundary conditions are considered, namely, two limiting cases of zero surface impedance (or perfect electric conductor), infinite surface impedance (or perfect magnetic conductor), and a third case where the structure is in contact with a real metal. In the latter case, we show that the existence of the interface state can be demonstrated based on topological arguments using the Zak phase. We also demonstrate that if a finite size comb-crystal is vertically grafted along a horizontal waveguide, the PTSs can be detected from the dips in the amplitudes of transmission and reflection coefficients as well as from the peaks in their delay times and the local density of states (LDOS). Our theoretical study is first performed analytically with the help of a Green’s function method, which allows the calculation of the dispersion relations of the bulk and surface modes and the LDOS, as well as the transmission and reflection coefficients of the plasmonic comb-like structure. Then, these results are confirmed by a numerical simulation utilizing a 2D finite element method. Besides providing a deep physical analysis of the PTSs, our work demonstrates the capability of the analytical method as a predictive approach in more complex structures. The proposed designs in this paper can be useful to realize highly sensitive plasmonic nanosensors.

show abstract

Surface modes in plasmonic stubbed structures

Cited by 2 publications

References 30 publications

Bound States in the Continuum and Induced Resonances in a Simple Plasmonic Waveguide with Sensing Application

Bound States in the Continuum and Induced Resonances in a Simple Plasmonic Waveguide with Sensing Application

Plasmonic Tamm states in periodic stubbed MIM waveguides: analytical and numerical study

Contact Info

Product

Resources

About