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arXiv 0909.1930physics.optics
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太赫兹波负折射率波片的强双折射割线对结构

Strongly birefringent cut-wire pair structure as negative index wave plates at THz frequencies

P. Weis, O. Paul, C. Imhof, R. Beigang, M. Rahm

摘要:

我们报道了一种新的方法设计和制造的薄波片与高传输太赫兹(THz)制度。波片基于强双折射切割线对超材料,其对于入射波的两个正交偏振分量表现出相反符号的折射率。作为具体的例子,我们制造和研究的四分之一和一个半波片,揭示了在1.34太赫兹和1.3太赫兹,分别为74%和58%的峰值强度透射率。此外,半波片在折射率为-1.7的1.3THz处显示出23的最大品质因数(FOM)。这对应于迄今为止在THz频率下报告的最高FOM之一。所呈现的结果证明,负折射率材料在太赫兹技术的光学组件方面进入应用阶段。

英文摘要:

We report a new approach for the design and fabrication of thin wave plates with high transmission in the terahertz (THz) regime. The wave plates are based on strongly birefringent cut-wire pair metamaterials that exhibit refractive indices of opposite signs for two orthogonal polarization components of an incident wave. As specific examples, we fabricated and investigated a quarter- and a half-wave plate that revealed a peak intensity transmittance of 74% and 58% at 1.34 THz and 1.3 THz, respectively. Furthermore, the half wave plate displayed a maximum figure of merit (FOM) of 23 at 1.3 THz where the refractive index was -1.7. This corresponds to one of the highest FOMs reported at THz frequencies so far. The presented results evidence that negative index materials enter an application stage in terms of optical components for the THz technology.

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