Highly Efficient Spintronic Terahertz Emitter Enabled by Metal–Dielectric Photonic Crystal,Advanced Optical Materials

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Highly Efficient Spintronic Terahertz Emitter Enabled by Metal–Dielectric Photonic Crystal
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-10-09 , DOI: 10.1002/adom.201800965
Zheng Feng ₁ , Rui Yu ₂ , Yu Zhou ₃ , Hai Lu ₄ , Wei Tan ₁ , Hu Deng ₅ , Quancheng Liu ₅ , Zhaohui Zhai ₆ , Liguo Zhu ₆ , Jianwang Cai ₃ , Bingfeng Miao ₂ , Haifeng Ding ₂

Affiliation

Spintronic terahertz (THz) emitter provides the advantages such as apparently broader spectrum, significantly lower cost, and more flexibility compared with the commercial THz emitters, and thus attracts great interest recently. In past few years, efforts have been made in optimizing the material composition and structure geometry, and the conversion efficiency has been improved close to that of ZnTe crystal. One of the drawbacks of the current designs is the rather limited laser absorption—more than 50% energy is wasted and the conversion efficiency is thus limited. Here, a novel device that fully utilizes the laser intensity and significantly improves the conversion efficiency is theoretically proposed and experimentally demonstrated. The device, which consists of a metal–dielectric photonic crystal structure, utilizes the interference between the multiple scattering waves to simultaneously suppress the reflection and transmission of the laser, and to reshape the laser field distributions. The experimentally detected laser absorption and THz generation show one‐to‐one correspondence with the theoretical calculations. The strongest THz pulse emission that presents a 1.7 times improvement compared to the currently designed spintronic emitter is achieved. This work opens a new pathway to improve the performance of spintronic THz emitter from the perspective of optics.

中文翻译：

金属介电光子晶体实现的高效自旋电子太赫兹发射器

与商用THz发射器相比，自旋电子太赫兹（THz）发射器具有诸如频谱更广，成本更低，灵活性更高的优点，因此最近引起了人们的极大兴趣。在过去的几年中，已经在优化材料组成和结构几何方面进行了努力，并且转换效率已经提高到接近ZnTe晶体的转换效率。当前设计的缺点之一是相当有限的激光吸收-浪费了超过50％的能量，因此转换效率受到限制。在此，从理论上提出并实验证明了一种充分利用激光强度并显着提高转换效率的新型装置。该器件由金属-电介质光子晶体结构组成，利用多个散射波之间的干扰来同时抑制激光的反射和透射，并重塑激光场分布。实验检测到的激光吸收和太赫兹产生与理论计算一一对应。实现了最强的THz脉冲发射，与当前设计的自旋电子发射器相比，发射功率提高了1.7倍。从光学的角度来看，这项工作为改善自旋电子太赫兹发射器的性能开辟了一条新途径。实现了最强的THz脉冲发射，与当前设计的自旋电子发射器相比，发射功率提高了1.7倍。从光学的角度来看，这项工作为改善自旋电子太赫兹发射器的性能开辟了一条新途径。实现了最强的THz脉冲发射，与当前设计的自旋电子发射器相比，发射功率提高了1.7倍。从光学的角度来看，这项工作为改善自旋电子太赫兹发射器的性能开辟了一条新途径。

更新日期：2018-10-09

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