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. 2023 Mar 25;14(4):729.
doi: 10.3390/mi14040729.

Numerical Assessment of a Metal-Insulator-Metal Waveguide-Based Plasmonic Sensor System for the Recognition of Tuberculosis in Blood Plasma

Muhammad A Butt  1
Affiliations

Numerical Assessment of a Metal-Insulator-Metal Waveguide-Based Plasmonic Sensor System for the Recognition of Tuberculosis in Blood Plasma

Muhammad A Butt. Micromachines (Basel). .

Abstract

In this paper, a numerical analysis of a plasmonic sensor based on a metal-insulator-metal (MIM) waveguide is conducted for the detection of tuberculosis (TB)-infected blood plasma. It is not straightforward to directly couple the light to the nanoscale MIM waveguide, because of which two Si3N4 mode converters are integrated with the plasmonic sensor. This allows the efficient conversion of the dielectric mode into a plasmonic mode, which propagates in the MIM waveguide via an input mode converter. At the output port, the plasmonic mode is converted back to the dielectric mode via the output mode converter. The proposed device is employed to detect TB-infected blood plasma. The refractive index of TB-infected blood plasma is slightly lower than that of normal blood plasma. Therefore, it is important to have a sensing device with high sensitivity. The sensitivity and figure of merit of the proposed device are ~900 nm/RIU and 11.84, respectively.

Keywords: blood plasma; metal-insulator-metal waveguide; mode converter; plasmonics; surface plasmon polariton; tuberculosis.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Schematic representation of a MIM waveguide-based plasmonic sensor; (b) Transmission spectra of the sensor with a metallic island and without a metallic island.
Figure 2
Figure 2
Device optimization: (a) Transmission vs. L, (b) Field confinement in the cavity versus g, (c) Transmission versus g1.
Figure 3
Figure 3
H-field distribution at (a) an on-resonance state and (b) an off-resonance state.
Figure 4
Figure 4
Sensing performance; (a) transmission spectrum of the sensor in the presence of normal and TB-infected blood plasma; (b) resonance wavelength versus RIU.
Figure 5
Figure 5
Schematic representation of the MIM waveguide-based plasmonic sensor integrated with dielectric mode converters.
Figure 6
Figure 6
(a) Schematic representation of a mode converter integrated with a MIM waveguide; (b) Effective index versus tapered waveguide width. Inset shows the E-field distribution and effective index in the waveguide at a different position along the tapered waveguide.
Figure 7
Figure 7
H-field distribution in the plasmonic sensor system at, (a) on-resonance state, (b) off-resonance state.
See this image and copyright information in PMC

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References

    1. Maier S. Plasmonics: The promise of highly integrated optical devices. IEEE J. Sel. Top. Quantum Electron. 2006;12:1671–1677. doi: 10.1109/JSTQE.2006.884086. - DOI
    1. Butt M.A., Khonina S.N., Kazanskiy N.L. Plasmonics: A necessity in the field of sensing-A review (invited) Fiber Integr. Opt. 2021;40:14–47. doi: 10.1080/01468030.2021.1902590. - DOI
    1. Zhang Y., Zhang A. Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XX. SPIE; San Diego, CA, USA: 2022. Additive printing of gold/silver nanostructures towards plasmonic metasurfaces.
    1. Butt M., Kazanskiy N., Khonina S. Miniaturized design of a 1 × 2 plasmonic demultiplexer based on metal-insulator-metal waveguide for telecommunication wavelengths. Plasmonics. 2023;18:635–641. doi: 10.1007/s11468-023-01795-z. - DOI
    1. Kumar S., Singh L., Swarnakar S. Design of one-bit magnitude comparator using nonlinear plasmonic waveguide. Plasmonics. 2017;12:369–375. doi: 10.1007/s11468-016-0273-7. - DOI

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