具有超小光斑点和高通光效率的AlGaAs 四面锥尖的模拟和优化

本文我们利用时域有限差分方法研究和比较了四种类型探针的光发射斑点和通光效率，在这些探针中，全镀薄金属银膜的AlGaAs 四面锥尖可提供最高的通光效率和单个近场光斑点。探针镀有3 nm银膜并利用波长800 nm入射光照射是提供高通光效率和超小光斑点的优化条件，高通光效率和超小光斑点的光探针使我们能实现超高密度光存储。     

光学玻璃的发展及其应用

随着光子学技术的发展，利用玻璃和光的相互作用改变光的极化态、频率、相干性和单色性，以及产生光子和探测光子的新型光功能玻璃成为光学玻璃发展的主要方向。本文针对光学玻璃及其在光学和信息技术等相关应用领域的重要性和发展作了介绍，重点阐述了非线性光学玻璃、梯度折射率光学玻璃、激光玻璃以及其他光功能玻璃的主要特性和发展状况，并对我国的光学玻璃工业发展作了回顾。     

Photopromoted carbonylation of 1-bromo-6-chlorohexane under ambient conditions

Photopromoted carbonylation of 1-bromo-6-chlorohexane with CO catalyzed by CuBr2 and CdI2 has been carried out under ambient conditions. The results indicate that the carbonylation proceeds with the major product of chloroester ClCH2（CH2）5COOCH3 under catalysis of CuBr2. Furthermore, the activity of the carbonylation can be improved by addition of basic additives （NaOAc, Na3PO4 or （n-C4H9）3N）. Among these additives, （n-C4H9）3N is the most efficient in terms of the yield of ClCH2（CH2）5COOCH3. However, the methoxycarbonyl substituting chlorine product of BrCH2（CH2）5COOCH3 is not obtained in the presence of CdI2. This is quite different from the carbonylation of monochloroalkane.     

Photochemical degradation of environmentally persistent perfluorooctanoic acid （PFOA） in the presence of Fe（Ⅲ）

Environmentally persistent and bioaccumulative perfluorooctanic acid （PFOA） was difficult to be decomposed under the irradiation of 254 nm UV light. However, in the presence of 80μmol/L Fe（Ⅲ）, 80% of PFOA with initial concentration of 48μmol/L （20 mg/L） was effectively degraded and 47.8% of fluorine atoms in PFOA molecule were transformed into inorganic fluoride ion after 4 h reaction. Shorter chain perfluorocarboxylic acids bearing C3-C7 and fluoride ion were detected and identified by LC/MS and IC as the degradation products in the aqueous solution. It was proposed that complexes of PFOA with Fe（Ⅲ） initiated degradation of PFOA irradiated with 254 nm UV light.