复合鱼鳞型超构材料中光控Fano谐振的设计

Optically controlled Fano resonance in hybrid fishscale metamaterial

摘要:

为解决传统超构材料存在的结构一旦形成，其谐振特性便无法进行动态可调的问题，本文将鱼鳞型超构材料与光电导材料硅相结合，实现了太赫兹波段Fano电磁响应的动态调控。该复合超构材料由鱼鳞型金属线、硅层以及聚酰亚胺组成。在鱼鳞型结构的金属弧线无、有缝隙两种情况下，研究了电磁波的入射角度和硅的电导率对Fano谐振的影响。当硅的电导率达到1×10³ S/m时，多频点电磁响应的调制深度都接近1。结果表明，调节缝隙宽度可以成为Fano谐振工作频率调控的有效方式。本文为实现超构材料中Fano谐振的可调谐特性提供了一种可行途径，对实际应用中太赫兹波的主动调控、传感等方面具有重要意义。

Abstract:

The resonance features of traditional metamaterial are fixed and unable to be tuned dynamically. A hybrid fishscale metamaterial combined with integrated photoconductive silicon is proposed to realize a tunable THz Fano response. The hybrid metamaterial is composed of a metallic fishscale structure, silicon layer and polymide substrate. The tunable Fano resonance is investigated by changing the incident angle and the conductivity of silicon layer in the proposed hybrid fishscale metamaterial without or with split in the metallic arc. When the conductivity of silicon layer reaches 1×10³ S/m, the modulation depth reaches 1 at multiple THz frequencies. The proposed hybrid metamaterial offers an opportunity to achieve tunability of Fano resonance, and is of importance for active tuning, sensing in THz applications.