近日，意大利高等师范学校的Daniele B. Provenzano和Giuseppe C. la Rocca合作并取得一项新进展。经过不懈努力，他们对一维回旋单轴光子晶体中的体模和表面模进行研究。相关研究成果已于2024年9月10日在国际知名学术期刊《物理评论A》上发表。

该研究团队研究了一维光子晶体的电磁体模式和表面模式的特性，该光子晶体由无损的旋电单轴层构成。研究人员发现了一种配置，能够支持一种表面模式的传播，该模式的群速度可根据单轴介电常数的符号表现为正或负。

研究人员还展示了引入旋磁性如何定性地改变光子能带结构，使得仅通过调节外部磁场的大小即可调整结构内允许的频率范围。

利用奥托（Otto）配置，研究人员对一个有限系统进行了分析，其中接近零的反射率值对应于大的古斯-汉欣（Goos-Hänchen）位移。此外，他们还探讨了波表现出非互易行为的低对称性配置。

附：英文原文

Title: Bulk and surface modes in a one-dimensional gyro-uniaxial photonic crystal

Author: Daniele B. Provenzano, Giuseppe C. la Rocca

Issue&Volume: 2024/09/10

Abstract: We examine the features of electromagnetic bulk and surface modes in a one-dimensional photonic crystal made up of lossless gyroelectric and uniaxial layers. We find a configuration that supports the propagation of a type of surface mode that can have either positive or negative group velocity, depending on the signs of the uniaxial permittivities. We also show how the introduction of gyrotropy qualitatively alters the photonic band structure, making it possible to modify the allowed frequency ranges within the structure just by varying the value of an external magnetic field. Exploiting an Otto configuration, we provide the analysis of a finite system where near-zero reflectivity values correspond to large Goos-Hanchen shifts. We also explore low-symmetry configurations where waves exhibit nonreciprocal behaviors.

DOI: 10.1103/PhysRevA.110.033514

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.033514