Highly Efficient Spintronic Terahertz Emitter Enabled by Metal–Dielectric Photonic Crystal

• DOI: 10.1002/adom.201800965
• Publication Date: 2018-10-10T05:56:50Z
• Authors: Zheng Feng; Rui Yu; Yu Zhou; Hai Lu; Wei Tan; Hu Deng; Quancheng Liu; Zhaohui Zhai; Liguo Zhu; Jianwang Cai; Bingfeng Miao; Haifeng Ding
• Keywords: Condensed Matter - Materials Science; Condensed Matter - Mesoscale and Nanoscale Physics; Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Materials Science (cond-mat.mtrl-sci); FOS: Physical sciences; 02 engineering and technology; 0210 nano-technology; 7. Clean energy; Physics - Optics; Optics (physics.optics)

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