外力驱动下耦合弹簧振子的法诺共振

法诺共振是物理体系中普遍存在的一种非对称共振现象,它最早起源于量子物理,其微观图像是原子谱线中窄的分离态与宽的连续态之间的相干干涉.本文利用经典力学体系中两个弹簧振子的耦合,使其中一个弹簧振子受到周期性外力的驱动,成功类比了量子力学中的法诺共振现象.通过分析每个弹簧振子的动力学方程,严格求解它们的振动公式,从而得到每个...     

实验室环境思政的思考与构建

中国地质大学物理实验教学中心结合实验室的具体情况,通过大师故事、中国故事、优秀学生事例等内容在实验教学环境中充分融入了思政元素,构建了环境思政的硬环境.在此基础上,通过人文元素的熏陶和教师的言传身教等构建了环境思政的软环境.环境思政的硬环境和软环境形成了立体化的知识传授和价值塑造的教学体系.     

Zero Refractive Index Properties of Two-Dimensional Photonic Crystals with Dirac Cones

The zero refractive index properties of two-dimensional photonic crystals(PCs) are studied theoretically. Three necessary conditions for PCs to mimic the zero index materials(ZIMs) are obtained. In addition, through a comparative study of the properties for two representative PC structures with different types of Dirac cones, we find that the PC with a Dirac-like cone which meets the three necessary conditions does not behave as a ZIM in some cases. Further analysis shows that its non-zero index properties originate from the flat dispersion band.These findings clarify the fundamental physical issue of which type of Dirac cone PC can mimic a real ZIM.