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太赫兹超材料响应频率及频带的调控

Keywords: 超材料,太赫兹,吸收频率,响应频带,调控

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Abstract:

自然界中很多材料在太赫兹(THz)频段没有电磁响应, THz超材料的出现为太赫兹技术的发展和应用带来了新的机遇.但目前超材料太赫兹响应的调节方式比较繁琐, 影响了理论与应用研究的开展.作者提出一种调制太赫兹超材料响应的简易新方法, 即将超材料的结构单元整体按比例地放大和缩小.仿真结果表明, 已满足阻抗匹配条件的超材料结构经整体比例变化之后, 仍然满足阻抗匹配条件;而且, 调整后超材料的吸收频率与尺寸变化的倍数成反比;令人惊奇的是, 超材料的响应频带也随着单元尺寸的整体缩小而变宽.通过这种简易的尺寸变化方式, 我们可以利用普通的超材料结构, 得到一定范围内对任意入射频率具有完美吸收(吸收峰值大于98%)的太赫兹超材料.这种调制方式使超材料的设计变得更加简化, 为超材料的理论与应用(特别是在器件中的应用)研究提供了更广阔的空间

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