Photonics Research, 2023, 11 (6): 1057, Published Online: May. 29, 2023  

Promoting spintronic terahertz radiation via Tamm plasmon coupling

Author Affiliations
1 School of Integrated Circuit Science and Engineering, Hefei Innovation Research Insititute, Beihang University, Beijing 100191, China
2 Anhui High Reliability Chips Engineering Laboratory, Hefei 230013, China
3 School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
4 Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China
5 School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Spectral fingerprint and terahertz (THz) field-induced carrier dynamics demands the exploration of broadband and intense THz signal sources. Spintronic THz emitters (STEs), with high stability, a low cost, and an ultrabroad bandwidth, have been a hot topic in the field of THz sources. One of the main barriers to their practical application is lack of an STE with strong radiation intensity. Here, through the combination of optical physics and ultrafast photonics, the Tamm plasmon coupling (TPC) facilitating THz radiation is realized between spin THz thin films and photonic crystal structures. Simulation results show that the spectral absorptance can be increased from 36.8% to 94.3% for spin THz thin films with TPC. This coupling with narrowband resonance not only improves the optical-to-spin conversion efficiency, but also guarantees THz transmission with a negligible loss (4%) for the photonic crystal structure. According to the simulation, we prepared this structure successfully and experimentally realized a 264% THz radiation enhancement. Furthermore, the spin THz thin films with TPC exhibited invariant absorptivity under different polarization modes of the pump beam and weakening confinement on an obliquely incident pump laser. This approach is easy to implement and offers possibilities to overcome compatibility issues between the optical structure design and low energy consumption for ultrafast THz opto-spintronics and other similar devices.

Yunqing Jiang, Hongqing Li, Xiaoqiang Zhang, Fan Zhang, Yong Xu, Yongguang Xiao, Fengguang Liu, Anting Wang, Qiwen Zhan, Weisheng Zhao. Promoting spintronic terahertz radiation via Tamm plasmon coupling[J]. Photonics Research, 2023, 11(6): 1057.

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