4.7 Article

Surface exciton plasmon resonances (SEPR)-based sensors

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OPTICS AND LASERS IN ENGINEERING
卷 160, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2022.107273

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Surface exciton plasmon; Long range exciton polariton; Lossy mode resonance; Kretschmann-Raether

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A new type of resonance called surface exciton plasmon resonance (SEPR) has been achieved in the development of sensors. By adjusting the incidence angle, the central wavelength of the resonance can be shifted, showing high sensitivity.
A new type of resonance in the development of sensors using long-range surface exciton polariton (LRSEP) phe-nomena has been coined: surface exciton plasmon resonance (SEPR). The resonance was obtained in the reflected spectrum of a Kretschmann-Raether setup with a two-coupled-interface structure composed of 412 nm magne-sium fluoride and 50 nm chromium thin films. The roles of different parameters such as thicknesses of the films and the incidence angles have been simulated. Some preliminary experimental results show a promising perfor-mance with a shift of the resonance central wavelength with changes in the incidence angle of-136.52 nm/degrees and a sensitivity of 23,221 nm/refractive index unit.

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