Numerical Investigation of Multifunctional Plasmonic Micro-Fiber Based on Fano Resonances and LSPR Excited via Cylindrical Vector Beam
<p>(<b>a</b>) Sketch map of microfiber integrated with an Ag nanocube on its end-face excited by LPB. (<b>b</b>) Sketch map of RI sensing of the gas surrounding by the Ag nanocube based fiber sensor. (<b>c</b>) Sketch map of RI sensing of the solid surrounding by the Ag nanocube based fiber sensor. (<b>d</b>) Normalized scattering spectra of the fiber sensor surrounded by solids with different RI of 1.50, 1.51, 1.52, 1.53, 1.54, 1.55, respectively. (<b>e</b>) Normalized scattering spectra of the fiber sensor surrounded by gases with different RI of 1.00, 1.01, 1.02, 1.03, 1.04, 1.05, respectively. (<b>f</b>) The peak position of the scattering spectra in (<b>d</b>) (bottom) and (<b>e</b>) (top) varies with the increase of RI (black) respectively and the corresponding fitted line (red).</p> "> Figure 2
<p>(<b>a</b>) Cross-section diagram of nanocube-based fiber sensor in plane <span class="html-italic">α</span> of <a href="#sensors-21-05642-f001" class="html-fig">Figure 1</a>a for nano-distance detection. (<b>b</b>) Illustration of the nanocube-based D<sup>0</sup> and Q<sup>0</sup> mode. (<b>c</b>) Normalized scattering spectra of the fiber sensor surrounded by solid with different distances, keeping solid RI of 1.50. (<b>d</b>) The peak position labeled 1 of the scattering spectra in (<b>c</b>) varies with the increase of distance <span class="html-italic">g</span> between the nanocube and solid.</p> "> Figure 3
<p>(<b>a</b>) Sketch map of microfiber integrated with a nanocube on its side-face excited by LPB. (<b>b</b>) Electric intensity distributions of plane <span class="html-italic">β</span> under excitation of LPB with polarization direction parallel to <span class="html-italic">x</span>-axis. (<b>c</b>) Electric intensity distributions of plane <span class="html-italic">β</span> under excitation of LPB with polarization direction parallel to <span class="html-italic">y</span>-axis. (<b>d</b>) Sketch map of microfiber integrated with a nanocube on its end-face excited by LPB. (<b>e</b>) Electric intensity distributions of plane <span class="html-italic">γ</span> under excitation of LPB with polarization direction parallel to <span class="html-italic">x</span>-axis. (<b>f</b>) Electric intensity distributions of plane <span class="html-italic">γ</span> under excitation of LPB with polarization direction parallel to <span class="html-italic">y</span>-axis.</p> "> Figure 4
<p>(<b>a</b>) Diagram of microfiber integrated with a nanocube on its side-face excited by CVB. (<b>b</b>) Electric intensity distributions of plane <span class="html-italic">β</span> under APB excitation. (<b>c</b>) Electric intensity distributions of plane <span class="html-italic">β</span> under RPB excitation. (<b>d</b>) Diagram of microfiber integrated with a nanocube on its end-face excited by CVB. (<b>e</b>) Electric intensity distributions of plane <span class="html-italic">γ</span> under APB excitation. (<b>f</b>) Electric intensity distributions of plane <span class="html-italic">γ</span> under RPB excitation.</p> "> Figure 5
<p>(<b>a</b>) Cross-section diagram of nanocube-based fiber sensor in plane α of <a href="#sensors-21-05642-f001" class="html-fig">Figure 1</a>a for solid sensing under oblique incidence with a dip angle of 15°. (<b>b</b>) Normalized scattering spectra of the fiber sensor under oblique incidence surrounded by solids with different RI of 1.50, 1.51, 1.52, 1.53, 1.54, 1.55, respectively. (<b>c</b>) The peak position of the scattering spectrum in (<b>b</b>) varies with the increase of RI (black) and the corresponding fitted curve (red). (<b>d</b>) Cross-section diagram of nanocube-based fiber sensor in plane α of <a href="#sensors-21-05642-f001" class="html-fig">Figure 1</a>a for gas sensing under oblique incidence with a dip angle of 15°. (<b>e</b>) Normalized scattering spectra of the fiber sensor under oblique incidence surrounded by gases with different RI of 1.00, 1.01, 1.02, 1.03, 1.04, 1.05, respectively. (<b>f</b>) The peak position of the scattering spectrum in (<b>e</b>) varies with the increase of RI (black) and the corresponding fitted line (red).</p> "> Figure 6
<p>(<b>a</b>) Enhancement factor of electric field intensity induced by nanocube modified fiber on its side face excited via LPB, APB, and RPB respectively with the variation of the fiber diameter (<span class="html-italic">d</span> = 0.5, 1, 1.5, 2, 2.5, 3 μm). The size of the nanocube keeps constant of 60 nm. (<b>b</b>) Enhancement factor of electric field intensity induced by nanocube modified fiber on its end face excited via LPB, APB, and RPB respectively with the variation of the nanocube length (<span class="html-italic">a</span> = 10, 40, 60, 80, 100, 200 nm). The diameter <span class="html-italic">d</span> = 0.5 μm of the fiber remains unchanged.</p> ">
Abstract
:1. Introduction
2. Methods and Results
2.1. Refractive Index (RI) and Nano-Distance Sensor Based on Fano Resonances
2.2. Electric Field Enhancement Based on LSPR
3. Discussion
3.1. Fano Resonances under Oblique Incidence
3.2. Electric Field Enhancement Excited via CVB
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Liu, M.; Yu, L.; Lei, Y.; Fang, X.; Ma, Y.; Liu, L.; Zheng, J.; Lin, K.; Gao, P. Numerical Investigation of Multifunctional Plasmonic Micro-Fiber Based on Fano Resonances and LSPR Excited via Cylindrical Vector Beam. Sensors 2021, 21, 5642. https://doi.org/10.3390/s21165642
Liu M, Yu L, Lei Y, Fang X, Ma Y, Liu L, Zheng J, Lin K, Gao P. Numerical Investigation of Multifunctional Plasmonic Micro-Fiber Based on Fano Resonances and LSPR Excited via Cylindrical Vector Beam. Sensors. 2021; 21(16):5642. https://doi.org/10.3390/s21165642
Chicago/Turabian StyleLiu, Min, Lan Yu, Yunze Lei, Xiang Fang, Ying Ma, Lixin Liu, Juanjuan Zheng, Ke Lin, and Peng Gao. 2021. "Numerical Investigation of Multifunctional Plasmonic Micro-Fiber Based on Fano Resonances and LSPR Excited via Cylindrical Vector Beam" Sensors 21, no. 16: 5642. https://doi.org/10.3390/s21165642