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摘要

近年来, 电磁超构光栅为操控波的传播提供了新的思路和材料基础. 本文设计并研究了一种结构简单且易实现的反射型金属超构光栅, 其一个大周期内只包含两个结构单元, 通过简单的结构设计即可实现双通道中红外光的回射功能. 数值和仿真模拟计算表明: 对于某个特定设计的回射角度, 该金属超构光栅具有极高的回射效率(> 98%); 进一步研究表明, 改变超构光栅的周期长度就能实现不同角度的回射功能, 并且在大角度下依然保持较高的回射效率. 因此该金属超构光栅具有高效率大角度双通道回射特性.

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Abstract

How to effectively control the refraction, reflection, propagation and wavefront of dynamic waves or light has become one of hot research points in the field of optics. In the past few years, the concept of phase gradient metasurface has been proposed: it introduces a gradient of the phase discontinuity covering the entire angle 2 πalong the interface to provide an effective wave vector $\kappa $ and completely control the direction of outing wave. Therefore, the metasurface can possess many novel optical applications, such as holograms, metalenses, photonic spin Hall effect, etc. In this work, we design a simplified reflection-type optical metagrating. The results demonstrate that the metagrating can achive the function of two-channel retroreflection, that is, redirecting the incident wave back toward the source, with a nearly perfect conversion efficiency. The metagrating designed in this paper contains only two sub-cells with πreflection phase difference in period. The working wavelength ( λ) of metagrating is fixed at 3 μm. The two sub-cells are filled with an impedance matching material (their material relative refractive indexes are n ₁= 1 and n ₂= 1.5 respectively and their thickness is d= 1.5 μm.).The period length range is 1.5 μm ≤ p≤ 3 μm(considering reducing the reflection order). When the incident angle is ${\theta _{\rm{i}}}= \pm \arcsin [\lambda /(2p)]$ , the absolute values of the incident angle and the reflected angle are equal, and then retroreflection occurs. When the wavelength is greater than the period ( $\lambda \geqslant p$ ), the angle of retroreflection can be adjusted to any value ( $\left| {{\theta _{\rm{i}}}} \right| \geqslant {\rm{3}}{{\rm{0}}^ \circ }$ ) by adjusting the period p. In this work, COMSOL MULTIPHYSICS software is used to simulate the retroreflection reflectivity and field pattern of the designed metagrating. The results verify the two-channel retroreflection property of the metagrating. In addition,as the angle of incidence changes from 30° to 60°, the efficiency of retroreflection at any incident angle can reach to more than 95%. When the incident angle is 75.4°, the metagrating still has an efficiency of 80% retroreflection. Therefore, the metagrating also achieves the function of high-efficiency retroreflection at a large-angle. Comparing with multiple sub-cells’ metasurface, the simplified metagrating with two sub-cells enables a similar function of retroreflection, but has many potential advantages, and can play an important role in high-efficiency sensing, imaging and communication.

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作者及机构信息

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通信作者:金霞,xjin@suda.edu.cn; 曹燕燕,yycao@stu.suda.edu.cn;

基金项目:国家自然科学基金(批准号: 11974010)和江苏省高校自然科学研究基金(批准号: 16KJB140013)资助的课题

Authors and contacts

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Corresponding author:Jin Xia,xjin@suda.edu.cn; Cao Yan-Yan,yycao@stu.suda.edu.cn;

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 11974010) and the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China (Grant No. 16KJB140013)

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施引文献

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