Peng Bo, Chen Zhiyong, Li Yue, Liu Zhen, Liang Difei, Deng Longjiang
National Engineering Research Center of Electromagnetic Radiation Control Materials, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, China.
iScience. 2021 Dec 13;25(1):103623. doi: 10.1016/j.isci.2021.103623. eCollection 2022 Jan 21.
Two-dimensional (2D) van der Waals (vdW) ferromagnets have opened new avenues for manipulating spin at the limits of single or few atomic layers, and for creating unique magneto-exciton devices through the coupling of ferromagnetic (FM) orders and excitons. However, 2D vdW ferromagnets explored so far have rarely possessed exciton behaviors; to date, FM CrI have been revealed to show ligand-field photoluminescence correlated with FM ordering, but typically with a broad emission peak. Here, we report a straightforward approach to realize strong coupling of narrow helical emission and FM orders in CrI through microsphere cavity. The resonant whispering-gallery modes (WGM) of SiO microspheres cause strong oscillation helical emissions with a full width at half-maximum (FWHM) of ∼5 nm under continuous wave excitation. Reversible magnetic coding of helical luminescence is realized in the range of 950-1100 nm. This work enables numerous opportunities for creating magnetic encoding lasing for photonic integrated chips.
二维（2D）范德华（vdW）铁磁体为在单原子层或少数原子层极限下操纵自旋，以及通过铁磁（FM）序与激子的耦合创建独特的磁激子器件开辟了新途径。然而，迄今为止所探索的二维vdW铁磁体很少具有激子行为；到目前为止，已发现FM CrI表现出与FM序相关的配体场光致发光，但通常具有较宽的发射峰。在此，我们报告了一种通过微球腔实现CrI中窄螺旋发射与FM序强耦合的直接方法。SiO微球的共振回音壁模式（WGM）在连续波激发下会导致半高宽（FWHM）约为5 nm的强振荡螺旋发射。在950 - 1100 nm范围内实现了螺旋发光的可逆磁编码。这项工作为为光子集成芯片创建磁编码激光提供了众多机会。
