反射型光变色超表面滤光结构  

Reflective Metasurface Filter with Optical Variable Color

作　　者：宋志 路畅 魏国军 许宜申[1,2] 叶燕 陈林森 Song Zhi;Lu Chang;Wei Guojun;Xu Yishen;Ye Yan;Chen Linsen(School of Optoelectronic Science and Engineering,Soochoiv University,Suzhou,Jiangsu 215006,China;Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Laboratory of Modern Optical Technologies,Ministry of Education,Soochow University,Suzhou,Jiangsu 215006,China;Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow University,Suzhou,Jiangsu 215006,China)

机构地区：[1]苏州大学光电科学与工程学院,江苏苏州215006 [2]江苏省先进光学制造技术重点实验室、教育部现代光学技术重点实验室,江苏苏州215006 [3]苏州大学苏州纳米科技协同创新中心,江苏苏州215006

出　　处：《光学学报》2021年第20期138-146,共9页Acta Optica Sinica

基　　金：国家自然科学基金(62075149,61575132);江苏省自然科学基金(BK20201406);江苏高校优势学科建设工程资助项目。

摘　　要：提出了一种反射型超表面滤光结构,该滤光结构由基底、低折射率纳米光栅、Ag光栅、SiNx高折射率介质层组成。理论模拟结果表明:45°入射角下,在垂直于光栅栅线的入射平面内,反射谱峰值出现在475 nm波长处;在平行于光栅栅线的入射平面内,反射谱峰值出现在550 nm波长处。其电场分布特性表明,在不同的平面内TE偏振入射光激发的导模共振区域不同,TM偏振下激发的导膜共振强度与表面等离子体共振强度不同,导致该结构在垂直于光栅栅线方向与平行于光栅栅线方向的两个平面内表现出两种截然不同的颜色。基于此制备的超表面结构样品不但光变色效果明显,且易于与纳米压印工艺相结合实现大幅面光变色结构制备,在防伪和图案信息编码等领域有广阔的应用前景。A reflective metasurface filter is proposed in this paper, which consists of a substrate, a nanograting with low refractive index, a Ag grating and a high-refractive-index dielectric SiN;layer. The simulation results show that with the incident angle of 45°, the reflection peak appears at the wavelength of 475 nm for the plane perpendicular to the grating line, while it is located at 550 nm for the plane parallel to the grating line. The electric field distribution characteristics demonstrate that for different incident planes, transverse electric field-polarized incidence excites guided-mode resonance in different areas, and the intensity of guided-mode resonance is different from that of surface plasmon resonance in the case of transverse magnetic field-polarized incidence. As a result, different colors are present in the two planes perpendicular to and parallel to the grating line, respectively. Accordingly, the fabricated metasurface sample has significantly optical variable color, which can be flexibly realized for large-area structures by nanoimprint lithography. The proposed reflective metasurface filter has a broad application prospect in the fields of anti-counterfeiting and information encoding.

关 键 词：光学器件 一维超表面 反射式滤光 光变色 表面等离子体共振 导模共振 

分 类 号：O436[机械工程—光学工程]