Suzuki Takehito, Nagai Masaya, Kishi Yudai
Opt Lett. 2016 Jan 15;41(2):325-8. doi: 10.1364/OL.41.000325.
Submilliradian accuracy utilizing terahertz waves is used to often discover and observe novel physical phenomena. However, conventional terahertz polarizers cannot simultaneously realize a high extinction ratio, which restricts the sensitivity of the polarization angle, and a high transmission power across a broad frequency band due to the wires involved. Here, inspired by metamaterials, we demonstrate an anisotropic cut-through metal-slit array for an ideal terahertz polarizer with a high extinction ratio and transmission power. Measurements confirm extinction ratios below approximately -50 dB and average transverse magnetic-mode transmission powers of over 80% from 0.3 to 2.2 THz. The extremely sensitive mechanism can shed light on a variety of path-breaking applications such as single-photon detection and quantum information and communication at lower frequencies.
利用太赫兹波实现亚毫弧度精度常用于发现和观测新的物理现象。然而，传统的太赫兹偏振器由于涉及金属丝，无法同时实现高消光比（这限制了偏振角的灵敏度）以及在宽频带上的高传输功率。在此，受超材料启发，我们展示了一种用于理想太赫兹偏振器的各向异性穿透金属狭缝阵列，其具有高消光比和传输功率。测量结果证实消光比低于约 -50 dB，并且在0.3至2.2太赫兹范围内平均横向磁模传输功率超过80%。这种极其灵敏的机制可为各种开创性应用提供思路，例如低频下的单光子探测以及量子信息与通信。
