Plasmonic Biosensors with Nanostructures
| Autor: | Jung-chung Hsu, 徐榮忠 |
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| Rok vydání: | 2008 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 This study has proposed two kinds of plasmonic biosensors with different nanostructures. Both of them have a common advanced feature: the surface plasmons can be excited in the upper interface of the metal layer by the light incident through the glass substrate. The first one is a coupled waveguide plasmonic biosensors with phase difference subwavelength gratings. To integrate subwavelength gratings with waveguide layer, the plasmonic biosensor just needs a compact optical metrology system and can improve the measuring resolution. Having 180o phase difference gratings, the surface plasmons are excited in the upper interface of the metal layer by the light incident through the substrate. The biosensor ignores the problem induced by the fluctuation of buffer solution when the light is incident from the buffer solution. The detection sensitivity and measuring resolution of the biosensor are verified and compared with other plasmonic biosensors with subwavelength gratings. The other is a plasmonic biosensor with perforated nanostructures. Some researches about the extraordinary optical transmission are based on plasmonic effects. However, this study will illustrate and compare the differences between them, and also point out the drawbacks for biosensors. To understand the mechanism of surface plasmons and apply it to biosensors, the new plasmonic biosensor with nanostructures is proposed. To measure the reflected light spectrum and decrease the thickness of the metal layer, the biosensor provides an optimum detection limit in reality. The proposed two plasmonic biosensors not only can provide the surface plasmonic effects in the upper interface of the metal layer even the incident light is from the buffer solution, but also achieve the high detection sensitivity and measurement resolution. They will be benefit to biosensing applications. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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