极紫外宽带多层膜反射镜离散化膜系的设计与制备  

Design and fabrication of EUV broadband multilayer mirrors with discrete thicknesses

作　　者：匡尚奇[1] 李硕 杨海贵 霍同林[3] 周洪军[3] KUANG Shang-qi;LI Shuo;YANG Hai-gui;HUO Tong-lin;ZHOU Hong-jun(School of Science,Changchun University of Science and Technology,Changchun 130022,China;Advanced Manufacturing Technology for Optical Systems Laboratory,Changchun Institute of Optics, Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China)

机构地区：[1]长春理工大学理学院,吉林长春130022 [2]中国科学院长春光学精密机械与物理研究所光学系统先进制造技术重点实验室,吉林长春130033 [3]中国科学技术大学国家同步辐射实验室,安徽合肥230029

出　　处：《光学精密工程》2018年第10期2395-2406,共12页Optics and Precision Engineering

基　　金：国家自然科学基金青年基金资助项目(No.61405189);吉林省科技发展计划资助项目(No.20150101019JC;20170312024ZG)

摘　　要：极紫外(EUV)宽带多层膜的光谱性能对膜厚控制精度要求较高,仅由时间控制膜厚的镀膜系统难以满足其精度控制要求。本文提出了基于进化算法的宽带EUV多层膜离散化膜系设计方法,与传统膜系设计相比,离散化膜系所制备多层膜具有更为优良的EUV反射光谱性能。为验证离散化膜系设计在宽带EUV多层膜研制中的优越性,采用磁控溅射方法对具有离散化膜系的宽带多层膜反射镜进行了制备和测试。测试结果表明:研制的宽角度多层膜反射镜可实现入射角带宽为0°～17°,高于41%的反射率;研制的堆栈宽角度多层膜反射镜可实现入射角带宽为0°～18.5°,高于35%的反射率;研制的宽光谱多层膜反射镜可实现波长带宽为12.9～14.9 nm,高于21%的反射率。Efficient broadband reflective Extreme Ultraviolet(EUV)multilayers require superior control and precision of layer thickness.A solely time-controlled deposition system can not meet the requirements of high accuracy.In this paper,we present a scheme for the design of broadband multilayers with discrete thicknesses based on an evolutionary algorithm.This method greatly improves the reflectivity curve compared to that of conventional multilayer mirrors without discrete thicknesses.To verify the superiority of the design,the broadband multilayers were deposited using a magnetron sputtering system.The EUV measurements reveal that the deposited aperiodic broad angular multilayers exhibits reflectivity values greater than 41%over an angle of incidence range of 0-17°for a fixed wavelength of 13.5 nm,the broad angular multilayers in four different stacks exhibits reflectivity values greater than 35%with a wide angular bandpass over an angle of incidence range of 0-18.5°for a fixed wavelength of 13.5 nm,and the broadband multilayer mirrors exhibits reflectivity values greater than 21%for wavelengths ranging between 12.9-14.9 nm for a fixed angle of incidence of 3°.This study demonstrates a great potential for the application of discrete design in the fabrication of EUV broadband multilayers with high accuracy.

关 键 词：多层膜设计 极紫外 离散化设计 宽带多层膜 

分 类 号：O484[理学—固体物理]