Theory and applications of surface plasmon resonance sensors

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2021-2-12

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Özdemircan, Furkan

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In this thesis, the electromagnetic theory of the surface plasmon resonance (SPR) phenomenon and its applications in optical sensing are investigated. An SPR sensor's operation is based on the excitation of surface plasmon waves (SPWs) at an interface between two different media, a metal layer, and a dielectric layer, with real parts of dielectric constants having opposite signs. The presence of the SPR shows itself with a sharp minimum in the reflection curve of the sensor that is operated by either the angular interrogation approach or the wavelength interrogation approach. The minimum SPR reflection location is highly sensitive to variations in relative permittivity and thickness parameters of the material layers. Even small changes in any one of these parameters can be accurately sensed by measuring the corresponding shift in the minimum point of the SPR reflection curve's location. Using the prism-based coupling method for the excitation of SPWs, the three-layer SPR sensor structure composed of the prism, the thin metal film, and the bulk dielectric layer is investigated by both analytical solutions and numerical simulations. Dielectric function models of different metals widely used in SPR sensors are included in the analyses to compare resulting sensor designs' performances. The feasibility of multi-purpose sensing with the same SPR topology is also investigated via numerical CST simulations using multi-section receptor patches in the sensing dielectric layer to detect the presence of different types of test targets in a given sample solution.

Subject Keywords

Surface Plasmon Waves, Surface Plasmon Resonance Sensor, Optical Sensing, Dielectric Function of Metals, Plasmonics

URI

https://hdl.handle.net/11511/89749

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

F. Özdemircan, “Theory and applications of surface plasmon resonance sensors,” M.S. - Master of Science, Middle East Technical University, 2021.