基于表面等离子体效应的光开关研究现状和进展

目前表面等离子体（surface plasmons,SPs）效应在光传感、光存储及生物光子学等领域的应用前景受到了广泛关注,通过计算模拟或实验基于SPs效应的光开关也层出不穷．文章较为系统地介绍了各种基于SPs效应的光开关原理和优缺点,对SPs全光开关做了重点介绍．     

监控DWDM系统工作波长的一种新方法

利用YVO4双折射晶体，设计了一种新型光通讯密集波分复用(DWDM)系统波长监控的方案，分析了其工作原理，并对方案的可行性进行了实验研究。理论和实验结果均表明，这种方案能够用于整个C波段的DWDM系统工作波长监控与锁定。这种方案与使用F-P标准具的透射谱进行波长监控的方法相比，具有标准工作波长容易判定、监控灵敏度倍增和易于集成等优点。     

Extraordinary Transmission through Metallic Grating with Subwavelength Slits for S-Polarization Illumination

Based on the rigorous coupled-wave analysis algorithm, we have systematically analysed the effect of the geometrical parameters of a dielectric film coated metallic grating with subwavelength slits on extraordinary optical transmission for s-polarization illumination. Results show that the dielectric film which sustains a waveguide electromagnetic mode on the top of the metallic lamellar grating can strongly enhance the transmittance, the positions of the transmission peaks are mainly determined by the period of the metallic grating, the thickness and refractive index of the dielectric film. This structure shows potential applications in excellent polarizers or polarization-isotropic devices at infrared spectral range by appropriately choosing the geometrical parameters.     

近场激发下的量子点共振能量转移研究

研究了近场光激发下的两量子点之间的共振能量转移情况,采用场极化率张量和量子光学中的光学布洛赫方程相结合的方法得到了两个量子点相互作用的密度矩阵元以及各自的发光强度,分析了周围环境(以探针体为例)对共振能量转移的影响,提供了一种在微纳尺度范围内研究量子点之间能量耦合和转移的理论分析方法.另外,还考虑了不同偏振态入射光对量子点发光强度的影响,简要分析表明当入射光偏振态和量子点之间连线方向相同时,量子点发光强度增强,反之减弱.     

利用表面等离子体增强发光二极管发光效率的研究进展

表面等离子体(Surface plasmons,SPs)是近年来国际上研究的一个热点. SPs具有空间局域性,局域场增强等特点,可以用来增强发光二极管(Light-emitting diode,LED)的发光效率.利用表面等离子体场局域性质,在共振时SPs有很高的态密度,这能够影响发光中心的辐射速率,提高发光中心的内量子效率;并且可以制作合适的结构,控制光的出射方向,提高发光二极管的提取效率.近年很多研究小组研究了SPs增强发光效率的物理机理,并得到一些很好的结果,本文对现阶段的研究进展进行综述.     

Optimization of computer-generated holograms for dynamic optical manipulation with uniform structured light spots

An optimized iterative technique combining the merits of conventional Gerchber-Saxton (G-S) and adaptive-additive (A-A) algorithms to design multilevel computer-generated holograms for the creation of a desirable structured intensity pattern for multiple optical manipulation is theoretically adopted. Optical trap arrays are demonstrated with the help of liquid crystal spatial light modulator and a microscopic optical tweezer system. Additionally, continuous locked-in transport and deflection of microparticles with the generated optical lattice is proven experimentally. The proposed method possesses apparent high efficiency, high uniformity, and dynamic and reconfigurable advantages.