用振幅-相位杂化滤波器提高近场光存储系统的焦深  

Increasing Focal Depth of Near-Field Optical Storage Systems by Five-Zone Amplitude-Phase Hybrid Filter

作　　者：方朝龙[1] 张耀举[1] 

机构地区：[1]温州大学物理与电子信息工程学院,浙江温州325035

出　　处：《激光与光电子学进展》2011年第3期46-49,共4页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(60777005)资助课题

摘　　要：为了提高近场固体浸没透镜(SIL)光存储系统的焦深,设计了五区振幅-相位杂化的滤波器。设计建立在矢量衍射理论基础上,应用MATLAB优化工具箱优化设计出可以获得最大焦深的滤波器结构参数。设计过程中,限定记录光斑的大小与没有滤波器时的光斑大小相等,而光斑的强度减小一半。所设计的滤波器可以使近场固体浸没透镜光存储系统的焦深提高1.6倍,同时记录光斑的大小随着轴向距离扩展的速度变缓。Based on the vector diffraction theory and by using the optimizing toolbox in MATLAB, a five-zone amplitude and phase hybrid filter is designed to increase the focal depth of a near-field solid immersion lens （SIL） optical storage system. In the process of design, the spot intensity is constrained to half of the spot intensity without a filter and the spot size is constrained to equal to the spot size without a filter. When the designed filter is applied in a SIL near-filed optical storage system it improves the focal depth by 1.6 times. At the same times, it effectively restrains the expansion of recorded spot size with the increase from the SIL-air interface.

关 键 词：矢量衍射 近场光存储 滤波器 焦深 

分 类 号：O438.2[机械工程—光学工程]