臺灣博碩士論文加值系統

本論文研究一種適用於水中環境的B型抗諧振反射光波導 (ARROW-B) 結構之表面電漿子共振(SPR)感測器。B型抗諧振反射光波導的入射導光區較大，能有效和單模光耦合，且可藉由調整結構來控制導光效率。使用模擬分析光場在元件中的傳播特性，有系統地設計感測元件，使其在水環境下具有最佳化的感測靈敏度。在感測區前後的光場傳播區設計具上下對稱的光波導隔離層，使元件能穩定導光而不受外界環境影響，並於感測區附加液體流道設計，幫助生物分子附著於感測區表面進行反應。此外進行即時免疫分析上的應用，感測器針對G型老鼠免疫球蛋白分子可達約10-10 g/ml 濃度之偵測極限，並於10-10 ~ 10-7 g/ml的濃度與訊號變化具有線性關係。利用原子力顯微鏡可直接觀察到生物分子確於金表面形成鍵結，最後完成抗體-抗原專一反應之檢測。

In this thesis, an ARROW-B SPR sensor used in aqueous environment has been investigated. ARROW-B waveguide with a thick guiding region provides efficient coupling with a single-mode fiber, and the propagation behavior can be modulated by adjusting the structure. Modal characteristics of ARROW-B are analyzed with simulation and designed for obtaining optimum sensitivity in aqueous environment. The waveguides in front and rear of the SPR sensing region have symmetric cladding structure to improve the immunity against environmental changes, and the sensing region is configured with a liquid flow channel which assists bioagents in attaching to the gold surface for reaction. Then we submit the sensors in application to real-time immunoassay, and attain 10-10 g/ml of concentration of mouse IgG in detection limit. The power differences have a approximately linear relation with the concentration of mouse IgG between 10-10 and 10-7 g/ml. Using the Atomic Force Microscopy, the biomolecules binding to the gold surface are visualized. Finally, the specific immunoassay of antibody-antigen conjugate is demonstrated.

1 Introduction 1
2 Surface Plasmon Resonance 4
2.1 Principles of SPR . . . 4
2.2 Derivation of SPR . . . 6
2.3 Measurement Methods of SPR Technology . . . 9
3 ARROW-B Waveguides 13
3.1 Two General Types: ARROW and ARROW-B . . . 14
3.2 Characteristics of an ARROW-B . . . 16
4 Methods for Analysis 18
4.1 Transfer Matrix Method . . . 18
4.2 Normalization of Guided Modes . . . 22
4.3 Eigenmode Expansion Analysis . . . 24
5 Design of Au-Coated ARROW-B SPR Sensors 27
5.1 ARROW-B Structure in Sensing Region . . . 27
5.2 ARROW-B Structure in Propagation Region . . . 28
5.3 Au-Coated SPR Sensors . . . 31
5.3.1 Buffer Layer . . . 31
5.3.2 Adjusting Layer . . . 32
5.3.3 Gold film . . . 33
6 Fabrication Process of SPR Sensors 36
6.1 Layout of SPR Sensor . . . 36
6.2 Fabrication Process . . . 38
6.3 Problems and Improvement . . . 44
7 Real-Time Immunoassay Detection 46
7.1 Optical Measurement Setup with Circulating-Flow System . . . 46
7.2 Reagents . . . 48
7.3 Feasibility Demonstration of Sensor Chips . . . 51
7.4 Measurements on Glucose Solution of Different Concentration . . . 53
7.5 Immunoassay Detection of Mouse IgG and Goat anti-mouse IgG . . . 53
7.6 AFM Analysis. . . 58
7.7 Specific Characterization . . . 59
8 Conclusion 62
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