一种实现光学全吸收的镀膜技术研究  

Study on a coating technology to achieve perfect optical absorption

作　　者：苏品刚[1] 胡涛政 董雯 周燕[1] SU Pingang;HU Taozheng;DONG Wen;ZHOU yan(School of Electronical and Information Engineering,Suzhou Vocational University,Suzhou 215104,China;School of Physical Science and Technology,Sochoow University,Suzhou 215006,China)

机构地区：[1]苏州市职业大学电子信息工程学院,江苏苏州215104 [2]苏州大学物理科学与技术学院,江苏苏州215006

出　　处：《光学技术》2018年第5期597-601,共5页Optical Technique

基　　金：江苏省青蓝工程资助项目;江苏省省自然科学基金资助项目(BK20160361);江苏高校品牌专业建设工程资助项目PPZY2015A089

摘　　要：金属微纳结构中的等离激元模式激发时,伴随着局域场的增强,存在对光的吸收增强的现象。但是这种光学吸收增强依赖于模式共振,因而吸收的带宽通常比较窄。项目提出了利用常规的镀膜工艺制备由金属颗粒-介质薄膜-金属薄膜构成的＂类三明治＂微纳结构,详细研究了上层金属颗粒尺寸和中间介质层薄膜厚度对光吸收的影响,优化制备工艺和微纳结构,提出最佳结构参数,实现对光的宽波段的近完美吸收。项目工艺快速简单,成本低廉,适合大批量以及大面积的样品制备。Accompanied with the excitations of the plasmonic resonances,the local optical fields around the metallic micro/nano-structures could be enhanced,resulting in a great enhancement of the optical absorption.However,the enhancement of optical absorption depends on mode resonance,so the absorption bandwidth is usually narrow.A sandwichlike three-layered nanostructure could be fabricated using conventional coating technology is presented.The nanostructure is consist of a monolayer metallic nanoparticles and a metal film separated by a dielectric gap layer.The effects of the size of the metallic nanoparticles and the thickness of the dielectric gap layer on the optical absorption of the sandwich-like nanostructure are studied.It is demonstrated that a sandwich-like nanostructure with the optimal parameters is capable of near-completely absorbing light within a broad-band spectral range.The method is simple,cost-effective,and suitable for a massive,large-area production of sandwich-like near-perfect optical absorbers.

关 键 词：光学材料 镀膜法 光学全吸收 表面等离激元 

分 类 号：TN213[电子电信—物理电子学]