串接式結構用於放大側拋式表面電漿共振光纖感測器之信號

表面電漿共振原理被廣泛的應用在化學及生物的特性和分子量級的交互作用測量上。傳統的表面電漿共振感測技術擁有高的靈敏度、動態變化的即時測量、以及在生物感測上無須標地等優點。而光纖本身擁有體積小、成本低、並且和表面電漿共振理論相同架構。光纖式表面電漿共振感測器是十分值得研發的在我們的實驗中介紹了一種新式的串接結構的平拋多模光纖感測器，我們利用白光光源作光纖特性的的量測，並確定串接結構確實可以放大表面電漿共振訊號靈敏度，然後使用690nm波長的雷射光源量測不同折射率的液體(如甲醇,純水,乙醇,丙醇,丁醇)。結果發現相較於一段原始光纖，兩段式串接在折射率1.33到1.38之間可以增強1.5倍的反應靈敏度，而在三串結構下可以放大近2倍的效果。同時我們也設計反射式的結構等效串接式結構，這結構將有助於讓光纖感測器被設計成為探針型，便於感測。

關鍵字

平拋光纖；表面電漿共振；感測器；串接

並列摘要

The phenomenon of surface plasmon resonance is widely applied in the biological and chemical sensing for characterizing and quantifying biomolecular interactions. The traditional advantages of SPR detective method have high sensitive response, kinetic study in real-time, and label-free for biological sensing. Optical fiber sensor has the characteristics of small, low cost, and the same scheme on SPR. It is worthy to develop the fiber SPR sensor. A novel cascaded structure of a side-polished multi-mode SPR cascaded fiber sensor is presented. In our experiment we use a white light (halogens light) source to carry out the measurements and the results showed that the cascaded structure can enhance and improve the measurement sensitivity significantly. Besides, a laser diode operated at 690nm wavelength as the light source was applied to measure methanol, DI water, ethanol, 1-propanol, and 1-butanol solutions. The results show that in the case of two cascaded section of side-polished fibers in the refractive index range from 1.33 to 1.38 RI have almost 1.5 times sensitivity than the original fiber with single section, and almost twice sensitivity in the case of three cascade section of the side-polished fiber. Beside, a reflection structure had been also carried out for the same measurements. The reflection-type fiber SPR sensor enable we to realized the facility of probing measurement. .

並列關鍵字

sensor ； cascade ； side-polished fiber ； Surface plasma resonant

參考文獻

FREDERICK M.SEARS Polarization-Maintenance Limits in Polarization-Maintaining Fibers and Measurements JOURNAL OF LIGHTWAVE TECHNOLOGY. VOL. 8. NO. 5. MAY 1990

[2]KIN SENG CHIANG, HELEN L. W. CHAN, AND JAMES L. GARDNER Detection of High-Frequency Ultrasound with a Polarization-Maintaining Fiber. JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 8, NO. 8. AUGUST 1990

[3]Norihiko Nishizawa and Toshio Goto, IEEE Widely Wavelength-Tunable Ultrashort Pulse Generation Using Polarization Maintaining Optical Fibers IEEE JOURNAL ON SELECTED TOPICS IN QUANTUM ELECTRONICS, VOL. 7, NO. 4, JULY/AUGUST 2001

[6] Tzyy-Jiann Wang, Cheng-Wei Tu, Fu-Kun Liu, and Hsuen-Li Chen, Surface Plasmon Resonance Waveguide Biosensor by Bipolarization Wavelength Interrogation, IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 16, NO. 7, JULY 2004

國際替代計量

串接式結構用於放大側拋式表面電漿共振光纖感測器之信號

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