One of the unique properties of metamaterials is the ability to manipulate electromagnetic waves at subwavelength scales, made possible by their structure on these scales. Here, rather than consider effective bulk properties, we consider the properties of microscopic features based on considering resonant unit cells. We used wire array metamaterials to form localized resonant cavities by changing the resonance frequency of one or more unit cells, surrounded by unchanged unit cells that do not support resonance for the propagating mode (i.e. forming a band gap). We validate our approach experimentally with electromagnetic waves in the terahertz range, demonstrating and characterizing subwavelength resonant cavities in this range. These resonant cavities can pave the way for ultra-compact subwavelength waveguides and other optical components.

中文翻译：

---

超材料亚波长太赫兹谐振腔

超材料的独特特性之一是能够在亚波长尺度上操纵电磁波，这得益于它们在这些尺度上的结构。在这里，我们不是考虑有效的体特性，而是基于考虑共振晶胞的微观特征的特性。我们使用线阵列超材料通过改变一个或多个晶胞的共振频率来形成局部共振腔，周围环绕着不支持传播模式共振的不变晶胞（即形成带隙）。我们使用太赫兹范围内的电磁波通过实验验证了我们的方法，展示和表征了该范围内的亚波长谐振腔。这些谐振腔可以为超紧凑的亚波长波导和其他光学元件铺平道路。