金膜上亚波长小孔阵列表面等离激元颜色滤波器偏振性质

金属薄膜上制备的表面等离激元颜色滤波器具有很强的颜色可调性. 在200 nm厚的金膜上, 通过聚焦离子束刻蚀, 制备一系列周期逐渐变化的圆形、方形、矩形亚波长尺寸小孔方阵列表面等离激元颜色滤波器, 改变入射光的偏振方向, 观察其超透射滤波现象. 研究发现: 对于矩形小孔阵列, 其透射光颜色随入射光偏振方向的变化而改变; 而对于圆形、方形的小孔阵列, 其透射光颜色对入射光的偏振方向并不敏感. 分析表明, 对于金膜上刻蚀的小孔结构, 虽然结构的周期性导致的表面等离激元极化子会对透射光的颜色变化产生一定影响, 但是随小孔形状变化的局域表面等离激元共振才是影响透射光颜色的决定性因素. 如果入射光没有在小孔中激发出局域表面等离激元, 则表面等离激元极化子对透射光的影响也会消失. 根据不同形状小孔周期结构透射光颜色随入射光的偏振变化特点, 制备出了包含两种小孔形状的复合周期结构. 随着入射光偏振方向的改变, 该结构会显示出不同的颜色图案. 关键词： 表面等离激元极化子 局域表面等离激元 颜色滤波器 亚波长小孔阵列     

折射型微透镜列阵的光刻热熔法研究

研究了制作折射型微透镜列阵的一种新方法光刻胶热熔成形法，获得了２０×２０的折射型微透镜列阵，单元微透镜相对口径为Ｆ／２，单元透镜直径为９０μｍ，中心间隔１００μｍ，透镜的波像差小于１．３波长。本文详细阐述了光刻热熔法的基本原理及微透镜设计方法，并讨论了工艺参数对微透镜列阵质量的影响。     

Compact Optical Omega Network

ＣｏｍｐａｃｔＯｐｔｉｃａｌＯｍｅｇａＮｅｔｗｏｒｋ￥ＷＡＮＧＮｉｎｇ；ＹＩＮＹａｏａｌ；ＱＩＡＮＪｉａｊｕｎ；ＬＩＵＬｉｒｅｎ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎｅＭｅｃｈａｎｉｃｓ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｐ．Ｏ...     

矩底拱面状微透镜阵列的氩离子束刻蚀

在ＺｒＯ２、ＩｎＰ、Ｓｉ及ＳｉＯ２即融凝石英衬底上用氩离子束刻蚀制作面阵矩底拱面状微透镜阵列，给出了氩离子束在不同的入射角度下刻蚀器件的速率与离子束能量之间的关系。实验表明，用国产ＢＰ２１２紫外正型光刻胶制作的光致抗蚀剂掩膜图形在经过优化的工艺条件下可以通过氩离子束刻蚀将预定图形转移到衬底材料中。     

Underwater CCD cameras for PIV flow mapping

Accurate estimation of the forces imposed on offshore structures due to wave and current loading has become more critical due to the introduction of floating production platforms. Work being carried at both Edinburgh and Glasgow Universities aims to measure these effects by force transducer measurements and Particle Image Velocimetry (PIV). A multiple CCD array system is presented which can directly measure accelerations and hence forces acting on offshore structures.     

Field Profile Synthesis with an Antenna Array

Two algorithms for the synthesis of a microwave beam with desired characteristics are discussed. The beam is composed by an array of either identical or non-identical antennas. In an example, the application of those algorithms for wireless power transmission is demonstrated.     

A multiple function sonar rangefinder for divers

The rangefinder described here is a self-contained instrument for hand-held operation by a diver for searching, tracking, navigation and surveying applications. It has four modes: 1 — to measure range to a passive target directly to ± 1 m; 2 — to measure range to a passive target indirectly to ± 0.1 m; 3 — to measure range to a coded transponder to either ± 1 m or ± 0.1 m; 4 — to indicate the presence of multiple targets downrange where each target occurs in a selected range interval. The pulse echo principle is employed, with pulses typically 250 μs long. The carrier frequency of 300 kHz can be altered easily if required by changing the transducer array.     

A More Efficient Synthetic Route to Perylene-porphyrin Arrays

We present an efficient synthetic route towards two kinds of perylene-porphyrin arrays. Starting from 5, 10, 15, 20-meso-tetraphenylporphyrin, two novel 9a and 9b were designed and synthesized with 40.3% and 35.1% yield, respectively.     

Millimeter wave imaging lens antenna

The factors which influence the design of lenses suitable for imaging at millimetre wavelengths are discussed. Examples are given of optical designs for a military tracking application, firstly for use with an open ended waveguide array, and secondly for use with monolithic arrays, each covering a field of view of ±20°.