基于光子晶体光纤的拉曼谐振增强效应研究

项目名称： 基于光子晶体光纤的拉曼谐振增强效应研究

项目编号： No.61308066

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 蒋书波

作者单位： 南京工业大学

项目金额： 27万元

中文摘要： 光子晶体光纤中采用表面增强拉曼散射（SERS）方法可显著增强光子空腔中某些样品的拉曼信号，进而实现灵敏度高的低浓度检测，在生物化学领域得到广泛应用。但是，该方法只能测量一些大分子结构物质，不具有普遍意义。本课题提出一种在光子晶体光纤中用谐振腔技术增强拉曼效应的新方法：在光子晶体光纤中，将光波能量限制在纤芯中并以导波膜形式沿光纤轴向传输，同时将光子晶体光纤的空腔作为样品池使用，限制光子散射，使单位面积的功率密度一直保持在较高水平，从而提高拉曼散射的强度；再进一步通过对瑞利光实现全反射，对拉曼光可以透过的谐振腔，使瑞利光子在谐振腔中反复通过，不断进行放大，大幅度增加光子的数量，提高光子与空腔中被测样品接触的几率，进而提高拉曼散射强度。该方法与被测样品成分无关，可以成为一种通用的检测手段，取代各种繁多的专用分析仪器。

中文关键词： 拉曼散射效应；空心光子晶体光纤；光学谐振腔；单光子检测；气体检测

英文摘要： In photonic crystal fiber, using the method of surface-enhanced Raman scattering(SERS) can significantly enhance some samples of the Raman signla in the fiber cavity, and then achieve the sensitivity of the detection of low concentrations, which has been widely used in the field of biochemistry. However, the method of SERS does not have universal significance, because it can only measure the material of macromolecular structure. The project proposed a new method, which is used cavity technology based on photonic crystal fiber cavity to enhance Raman effect: in photonic crystal fiber, the light wave energy is limited in the core and transmits along the fiber axial in the form of membrane of guided wave, while the cavity of the photonic crystal fiber is used as the sample pool. The method effectively limits the photon scattering and the power density per unit area has been able to remain at a relatively high lever, so that the intensity of Raman sacattering is increased. Further Laser photons is repeated through the resonator which only Raman light can through by use of total reflection, causing continuous optical amplification, a significant increase in the number of photons, improving the probability of photon caontacting with the sample of cavity, which increase the Raman scattering intensity. The method has n

英文关键词： Raman scattering；Hollow-core photonic crystal fiber；Optical resonator Cavity；Single photon detector；Gas detection