光控液晶覆蓋側磨光纖元件之研究

在各種專業的光器件中，側磨光纖的光傳輸，極大的影響著應用特性，正受到人們越來越多的的關注。無論是實驗室研究領域，還是在商用領域上，都已經製成許多種光纖通信或光纖傳感的全光纖器件。全光纖器件體積小，容易於與光纖系統連接；在做側磨光纖器件時，因為沒有理論上計算的支持，需要通過做大量的實驗工作，在對比和改善中才能得到性能較好的器件。本文以實驗的方法，在側磨光纖研磨區上，覆蓋不同折射率液晶混合物，並用以不同光波波長照射，測量了光纖相關輸出損耗，得出的實驗結果；側磨光纖中傳輸光功率，會隨著研磨區覆蓋的液晶，因特定光波波長的改變而改變。利用側磨光纖(SPF)的研磨區，對外部折射率的特性，研究了混合有液晶的混合物，在紫外光照射下產生的光致異構效應。將液晶和偶氮苯(AZO)等2種材料的混合物，覆蓋在側磨光纖傳感器的研磨區上，備制成混合物薄膜；再使用紫外光照射覆蓋於側磨光纖上的薄膜，導致側磨光纖中傳輸光功率改變。實驗結果：側磨光纖上的混合物薄膜，在紫外光照射下有光響應特性，會產生折射率變化、相位差及傳輸功率的改變；這表明此光響應材料是紫外光折變材料。而這種光響應材料在弱光下，就可應用於製作新型全光纖光控器件、傳感器、紫外光感測器。

關鍵字

側磨光纖；液晶；偶氮苯

並列摘要

In a variety of professional optical devices, the side grinding optical transmission fiber, which greatly affects the application characteristics, is being more and more people's attention. Both laboratory research field, or in the commercial areas, have made many kinds of optical fiber communication or optical sensing all-fiber devices. All-optical devices, small size, easy to connect and fiber optic systems; wear when doing side optical devices, because there is no support for the theoretical calculation, need to do a lot of experimental work, in contrast to get better and improve the performance of the device. In this paper, experimental methods, on the side of the fiber mill grinding zone, covering a different refractive index of the liquid crystal mixtures, and exposure to different wavelengths of light, measuring the output of the fiber-related losses, the experimental results obtained; side grinding fiber transmission optical power, will As the grinding zone covering the liquid crystal due to changes in the specific wavelength of light is changed. Using side polished fiber (SPF) of the grinding zone, the refractive index of the external characteristics studied mixed liquid crystal mixture, photoisomerization effect generated under UV irradiation. The mixture of liquid crystal and azobenzene (AZO) and other two kinds of material covered in the side of the optical fiber sensor mill grinding zone, prepare a thin film made of a mixture; then use UV light on the side of the mill fiber covering film, resulting in side grinding optical fiber transmission power is changed. Results: Side grinding mixture film on the fiber under UV light irradiation response characteristics, will produce change in refractive index, phase change and transmission power; This indicates that this material is UV light response photorefractive material. And this light-responsive materials in low light, can be used in making new all-fiber optical controlled devices, sensors, ultraviolet sensors.