The giant enhancement of Fano-type resonance in a gain-assisted silicon slab array

Giant resonance enhancement is demonstrated to be due to the Fano interference in a grating waveguide composed of gain-assisted silicon slabs. The Fano mode is characterized by its ultra-narrow asymmetric spectrum, different from that of a pure electric or magnetic dipole. The simulation indicates that a sharp Fano-interfered lineshape is responsible for the giant resonance enhancement featuring the small-gain requirements.     

The metamaterial analogue of electromagnetically induced transparency by dual-mode excitation of a symmetric resonator

Electromagnetically induced transparency （EIT） is obtained in a symmetric U-shaped metamaterial, which is at- tributed to the simultaneously excited dual modes in a single resonator under lateral incidence. A large group index accom- panied with a sharp EIT-like transparency window offers potential applications for slowing down light and sensing.     

Enhanced circular dichroism based on the dual-chiral metamaterial in terahertz regime

The obvious circular dichroism(CD) and optical activity can be obtained based on the chiral metamaterial due to the plasmon-enhanced effect, which is very attractive for future compact devices with enhanced capabilities of light manipulation. In this paper, we propose a dual-chiral metamaterial composed of bilayer asymmetric split ring resonators(ASRR)that are in mirror-symmetry shape. It is demonstrated that the CD can get enhancement in the terahertz regime. Moreover,the CD can be further improved by modulating the asymmetry of ASRR. The enhanced CD effect in the terahertz regime has great potential applications in sensing, biomedical imaging, and molecular recognition.     

霓虹的重现及其偏振和干涉研究

本文基于2021年全国大学生物理竞赛(创新赛)的命题之一“霓虹现象的设计与重现”,设计了一种基于超连续谱激光器的霓虹重现方案,得到了很好的实验效果.相比已报道的霓虹实验,本文的方案既能呈现清晰的霓虹现象,又能定量测量霓虹的偏振和干涉等波动光学特性.本实验从生活中常见的物理现象出发,契合大学物理教学中的波动光学内容,是一个集趣味性和探究性一体的课题物理实验教学案例.