Surface plasmons and Bloch surface waves: Towards optimized ultra-sensitive optical sensors

Lereu, Aude L.; Zerrad, Myriam; Passian, Ali; Amra, Claude

doi:10.1063/1.4991358

Cited by 45 publications

(35 citation statements)

References 58 publications

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“…In our proposed coupled mode system, we assume that A4 equals to 0 in the proposed structure. Then, we apply Equations (6)- (8) to Equations (4) and (5). The transmission coefficient in the proposed hybrid metasurface t = A4+/A1+, Thus, the transmittance T = │A4+/A1+│ 2 can be expressed as: Here, a 1 and a 2 are defined as complex amplitudes of LSPRs and SPPs.…”

Section: Structure and Theory Modelmentioning

confidence: 99%

“…Surface plasmons (SPs) are collective oscillations of excited electrons at the interface between the metal and dielectric, which can effectively confine and enhance the electric filed [1][2][3][4]. Thus, SPs have important applications in the field of optical sensings, lasers, photovoltaics, and so on [5][6][7][8][9]. Local surface plasmon resonances (LSPRs) is one kind of SPs, which are strongly confined at the surface of metal nanostructures with non-ignorable losses [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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

Xue

Cui

et al. 2020

Nanomaterials

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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.

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Section: Structure and Theory Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Xue

Cui

et al. 2020

Nanomaterials

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“…We would finally suggest three studies of interest, relevant to the EM imbalance. The first one is that the electric field enhancement and slow propagation can increase the sensitivity in sensing; dielectric and metal-included multilayers have been compared for sensing applications [40]. The enhanced nonlinearities can increase the sensitivity in SPP-enhanced Raman scattering and other nonlinear sensing, although they have not yet been discussed.…”

Section: Resultsmentioning

confidence: 99%

Electromagnetic-field imbalance in surface plasmon polariton and its role in slow propagation and field-matter interaction

Iwase

Baba

2019

J. Opt. Soc. Am. B

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We present the results of a theoretic study of the electromagnetic field imbalance in surface plasmon polaritons (SPPs), which reveal that the magnetic field components induced by the electric fields normal and parallel to a metal surface cancel each other in SPPs, resulting in an imbalance. A group velocity analysis shows that this imbalance contributes significantly to the slow propagation of SPPs. We also analyze the enhanced spontaneous emission and nonlinearity in plasmonic cavities, and the results indicate that the electromagnetic field imbalance must be considered to correctly estimate the interaction strength.

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“…The electric field distribution of TE mode should satisfy the following formula:   Figure 2a,b shows the band diagrams of the periodic PVDF/PC dielectric structure for TE and TM polarized modes. The numerical simulations were performed by means of the finite element method [19]. The white regions represent the 1D PhC forbidden band.…”

Section: Structure and Analysismentioning

confidence: 99%

Highly Sensitive THz Gas-Sensor Based on the Guided Bloch Surface Wave Resonance in Polymeric Photonic Crystals

et al. 2020

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THz waves have interesting applications in refractive index sensing. A THz gas sensor based on the guided Bloch surface wave resonance (GBSWR) in a one-dimensional photonic crystal (1DPhC), which consists of periodic polycarbonate (PC) layers and polyvinylidene fluoride (PVDF) layers, has been proposed. Numerical results based on finite element method (FEM) show that the photonic band gap that confines Bloch surface waves (BSWs) lies in the regime of 11.54 to 21.43 THz, in which THz wave can transmit in both PC and PVDF with the ignored absorption. The calculated sensitivity of hazardous gas HCN in angle is found to be 118.6°/RIU (and the corresponding figure of merit (FOM) is 227) and the sensitivity in frequency is 4.7 THz/RIU (the corresponding FOM is 301.3). The proposed structure may also be used for monitoring hazardous gases which show absorption to the incident THz wave. Further results show that for N2O gas, the maximum sensitivity goes up to 644 (transmittance unit/ one unit of the imaginary part of the refractive index). The proposed design may find applications in the detection of dangerous gases.

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Surface plasmons and Bloch surface waves: Towards optimized ultra-sensitive optical sensors

Cited by 45 publications

References 58 publications

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

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

Electromagnetic-field imbalance in surface plasmon polariton and its role in slow propagation and field-matter interaction

Highly Sensitive THz Gas-Sensor Based on the Guided Bloch Surface Wave Resonance in Polymeric Photonic Crystals

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