Diffractive optics has long served as the basis of spectroscopic measurements of materials. Operation in the resonance domain further allows these elements to achieve high efficiency and polarization control. An effective grating theory is a practical tool for modeling such optics, and here we extend use of this theory to the terahertz region, experimentally demonstrating an all-dielectric binary off-axis diffractive lens. We achieve a high-efficiency, polarization-independent optic that both focuses and disperses terahertz light, suggesting potential applications in pharmaceutical, security, and semiconductor imaging.

中文翻译：

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太赫兹区的共振域衍射透镜

衍射光学长期以来一直是材料光谱测量的基础。在谐振域中的操作进一步允许这些元件实现高效率和极化控制。有效的光栅理论是对此类光学器件进行建模的实用工具，在这里，我们将这一理论的应用扩展到太赫兹区域，以实验方式证明全电介质二元离轴衍射透镜。我们实现了一种高效的，偏振无关的光学元件，可以聚焦和分散太赫兹光，从而在制药，安全和半导体成像领域提出了潜在的应用前景。