二维光子晶体板动量空间中的偏振场(特邀)  

Polarization Field in Momentum Space of Two-Dimensional Photonic Crystal Slabs(Invited)

作　　者：王为民 寇君龙 陆延青[1,3,4] Wang Weimin;Kou Junlong;Lu Yanqing(School of Electronic Science and Engineering,Nanjing University,Nanjing 210023,Jiangsu,China;School of Integrated Circuit,Nanjing University,Suzhou 215163,Jiangsu,China;College of Engineering and Applied Sciences,Nanjing University,Nanjing 210023,Jiangsu,China;Wujin-NJU Institute of Future Technology,Changzhou 213153,Jiangsu,China)

机构地区：[1]南京大学电子科学与工程学院,江苏南京210023 [2]南京大学集成电路学院,江苏苏州215163 [3]南京大学现代工程与应用科学学院,江苏南京210023 [4]武进南京大学未来技术创新研究院,江苏常州213153

出　　处：《光学学报》2024年第10期47-60,共14页Acta Optica Sinica

基　　金：国家重点研发计划(2022YFA1405000);江苏省自然科学基金(BK20212004);江苏省前沿引领技术基础研究重大专项(BK20232001);国家自然科学基金优秀青年科学基金(海外)。

摘　　要：二维光子晶体板的介电常数分布具有面内的空间周期性,并支持可辐射到自由空间的导模共振。这些辐射到远场的模式可以用动量进行标记,并具有偏振态,因此可以定义动量空间中的偏振场。通过研究不同结构参数和对称性下偏振场的特性以及与外界相互作用的规律,能够为光场操控提供新思路。本文介绍了二维光子晶体板在动量空间中的偏振场的相关特性,并综述了近年来相关的研究和应用。Significance The two-dimensional photonic crystal slab(PhCS)is a structure characterized by the spatial periodicity of the dielectric constant within the plane.In contrast to traditional metamaterial surfaces,the two-dimensional PhCS enables light field manipulation in momentum space based on the Fourier principle,thus achieving complex and diverse functionalities.Since modes above the light cone can radiate to the far field and possess definite polarization states,polarization is matched with wave vectors,defining polarization fields in momentum space.Various polarization singularities exist within the polarization field,such as V points and C points.Previous studies generally focus on information such as frequency and momentum,while the polarization field can reflect the topological information of the bands and provide a new dimension for light field manipulation.For example,by controlling the evolution of polarization singularities,researchers have obtained bound states in the continuum(BICs)with robust characteristic and unidirectional guided resonances(UGRs).By utilizing these characteristics,researchers have designed high-performance lasers and realized complex light field manipulation and such functionalities as optical information processing.Compared to traditional structures,the two-dimensional PhCS exhibits non-local characteristics and has significant advantages in miniaturization and integration.Thus,it holds promising prospects for device applications.Studying the evolution of the polarization field helps guide the structural design of photonic crystal slabs,which expands the applications in communication,sensing,and other fields,and provides a deeper understanding of how topological photonics is manifested in optical systems.Progress We start by introducing the definition of the polarization field in the momentum space of the two-dimensional PhCS and introduce the concept of polarization singularities(Fig.1).Subsequently,an analysis is conducted from the perspective of symmetry,with the relationship

关 键 词：物理光学 光子晶体 偏振场 偏振奇点 拓扑电荷 

分 类 号：O436[机械工程—光学工程]