arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1012.1746physics.optics
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在太赫兹频率范围内具有强聚焦的基于超材料的梯度折射率透镜

Metamaterial-based gradient index lens with strong focusing in the THz frequency range

Jens Neu, Bernd Krolla, Oliver Paul, Benjamin Reinhard, René Beigang, Marco Rahm

摘要:

创新的太赫兹(THz)成像系统的发展最近已经成为科学工作的焦点,因为它能够通过纺织品或塑料筛选物质。具有高空间分辨率的THz成像系统的发明在质量控制、灰尘环境中的光谱学和安全检查领域中的应用越来越受关注。当前太赫兹成像系统的主要限制之一是低空间分辨率,这受限于缺乏具有强聚焦能力的太赫兹透镜。在这里,我们提出的设计,制造和光谱宽带超材料为基础的梯度折射率(GRIN)透镜的光学特性的测量,允许一个太赫兹辐射的焦点直径小于波长。由于亚波长厚度和高聚焦强度,所提出的GRIN透镜是朝向具有大幅提高的空间分辨率的紧凑型THz成像系统的重要一步。

英文摘要:

The development of innovative terahertz (THz) imaging systems has recently moved in the focus of scientific efforts due to the ability to screen substances through textiles or plastics. The invention of THz imaging systems with high spatial resolution is of increasing interest for applications in the realms of quality control, spectroscopy in dusty environment and security inspections. One of the main restrictions of current THz imaging systems is the low spatial resolution which is limited by a lack of THz lenses with strong focusing capabilities. Here we present the design, fabrication and the measurement of the optical properties of spectrally broadband metamaterial-based gradient index (GRIN) lenses that allow one to focus THz radiation to a spot diameter smaller than the wavelength. Due to the subwavelength thickness and the high focusing strength the presented GRIN lenses are an important step towards compact THz imaging systems with strongly improved spatial resolution.

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