The Effects of Adding Different Adhesive Layers with a Microstructure Fiber Sensor Based on Surface Plasmon Resonance: A Numerical Study

The near-field enhancement and localized surface plasmon resonance (LSPR) on the core-shell noble metal nanostructure surfaces are widely studied for various biomedical applications. However, the study of the optical properties of new plasmonic non-spherical nanostructures is less explored. This numerical study quantifies the optical properties of spherical and non-spherical (prolate and oblate) dimer nanostructures by introducing finite element modelling in COMSOL Multiphysics. The surface plasmon resonance peaks of gold nanostructures should be understood and controlled for use in biological applications such as photothermal therapy and drug delivery. In this study, we find that non-spherical prolate and oblate gold dimers give excellent tunability in a wide range of biological windows. The electromagnetic field enhancement and surface plasmon resonance peak can be tuned by varying the aspect ratio of non-spherical nanostructures, the refractive index of the surrounding medium, shell thickness, and the distance of separation between nanostructures. The absorption spectra exhibit considerably greater dependency on the aspect ratio and refractive index than the shell thickness and separation distance. These results may be essential for applying the spherical and non-spherical nanostructures to various absorption-based applications.

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Dual-Channel Surface Plasmon Resonance–Based Photonic Crystal Fiber Sensor with Metal-Ta2O5 Coating at Near-infrared Wavelength

Plasmonics ◽

10.1007/s11468-021-01503-9 ◽

2021 ◽

Author(s):

Shutao Wang ◽

Wenbo Ma ◽

Qi Cheng ◽

Na Liu ◽

Yuhong Lu ◽

...

Keyword(s):

Surface Plasmon Resonance ◽

Photonic Crystal ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Near Infrared ◽

Fiber Sensor ◽

Infrared Wavelength ◽

Crystal Fiber ◽

Dual Channel ◽

Channel Surface

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Design and validation of fiber optic localized surface plasmon resonance sensor for thyroglobulin immunoassay with high sensitivity and rapid detection

Scientific Reports ◽

10.1038/s41598-021-95375-y ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Hyeong-Min Kim ◽

Dae Hong Jeong ◽

Ho-Young Lee ◽

Jae-Hyoung Park ◽

Seung-Ki Lee

Keyword(s):

Surface Plasmon Resonance ◽

Optical Fiber ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Localized Surface Plasmon Resonance ◽

Optical Fiber Sensor ◽

Fiber Sensor ◽

Localized Surface Plasmon ◽

Simple Method ◽

Resonance Sensor

AbstractA simple optical fiber sensor based on localized surface plasmon resonance was constructed for direct and rapid measurement of thyroglobulin (Tg). Specific tests for Tg in patients that have undergone thyroidectomy are limited because of insufficient sensitivity, complicated procedures, and in some cases, a long time to yield a result. A sensitive, fast, and simple method is necessary to relieve the psychological and physical burden of the patient. Various concentrations of Tg were measured in a microfluidic channel using an optical fiber sensor with gold nanoparticles. The sensor chip has a detection limit of 93.11 fg/mL with no specificity for other antigens. The potential applicability of the Tg sensing system was evaluated using arbitrary samples containing specific concentrations of Tg. Finally, the sensor can be employed to detect Tg in the patient’s serum, with a good correlation when compared with the commercial kit.

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