Using Photonic Nanojets Generated by a Layer of Polystyrene Microspheres and Biocompatible Hydrogel Core-Shell Microspheres for Improving Surface-Enhanced Raman Scattering Applications
| Autor: | Yu-Jui Wang, 王于瑞 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 The photonic nanojets generated by polymeric microspheres are studied and used for further improving the detection sensitivity of kinetin, a kind of plant growth regulators, via the surface-enhanced Raman scattering method. Monodisperse polystyrene microspheres were prepared by using dispersion polymerization method and coated on the surface-enhanced Raman scattering substrate by air-water interfacial floating method. This combined structure enables the generation of photonic nanojets coupled with the plasmonic resonances so that the Raman signals can be enhanced. Further study of this proposed structure could be useful for optical sensing applications. We numerically studied the photonic nanojets brought about from biocompatible hydrogel core-shell microspheres with different optical properties. It was found that the presence of the shell layer can significantly affect the characteristics of the photonic nanojets, such as the focal distance, intensity, effective length, and focal size. The numerical simulations of the photonic nanojets from the biocompatible core-shell microspheres on a Klarite substrate, which is a classical surface-enhancing Raman scattering substrate, showed that the Raman signals in the case of adding the core-shell microspheres in the system can be further enhanced 23 times in water and 108 times in air as compared in the case in which no core-shell microspheres are present. Our study of using tunable photonic nanojets produced from the biocompatible hydrogel core-shell microspheres shows potential in future biosensing applications. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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