中文摘要

表面電漿共振感測技術可偵測金屬與介電質層間界面之物理及化學微量變化。對於金屬表面鄰近之介電材料，表面電漿共振與該介電常數之微量變化有極佳之靈敏度。應用於光學感測器在許多方面之應用上，皆可提供相當不錯之靈敏度。這些應用諸如氣體化學感測、生物感測與雷射切割之即時觀測等等。對於貴金屬而言，表面電漿共振感測之反射比曲線於可見光／紅外光頻譜間將會出現非常陡峭之現象，此乃表面電漿共振之共振條件對於環境效應有著莫大之靈敏度。尤其深受感測環境溫度變化之影響。溫度上升時，將致使靈敏度變差。本文將建立一套以表面電漿共振為感測機制之光學式生物感測界面，且該靈敏度為溫度函數之理論模型。此理論模型可提供預測表面電漿共振之靈敏度隨溫度變化的情形。經由數值分析所得結果，可得到環境溫度變化與各膜層折射率與膜厚間之關係，進而瞭解對表面電漿共振感測靈敏度之影響。

Abstract

Surface plasmon resonance is a relatively simple but powerful optical technique that is capable of monitoring chemical and physical process at metal-dielectric interface in situ. Surface plasmon resonance is exquisitely sensitive to small changes in the dielectric constant near a metal surface. It is well established that the optical sensor based on the surface plasmon resonance at a metal-dielectric interface can provide a very high sensitivity for many applications. These applications include, for example, gas and chemical sensing, biosensing, a real-time monitoring of laser-ablation processes. The reflectance curve can be very steep for noble metals at visible/IR frequencies since the SPR resonance condition is highly sensitive to the ambient conditions. Especially, it is known that the sensitivity is affected by the variation of temperature of the sensing environment. It generally leads to lower sensitivity at elevated temperatures. In this thesis, a theoretical model is developed for to investigate the temperature–dependent sensitivity of the optical biosensing based on surface plasmon resonance. Moreover, the influences of refractive index and thickness of each thin film due to variation of environmental temperature upon SPR sensitivity are evaluated and discussed.

文獻

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