Observation of gapless corner modes of photonic crystal slabs in synthetic translation dimensions

作     者：WEN-JIN ZHANG HAO-CHANG MO WEN-JIE CHEN XIAO-DONG CHEN JIAN-WEN DONG WEN-JIN ZHANG;HAO-CHANG MO;WEN-JIE CHEN;XIAO-DONG CHEN;JIAN-WEN DONG

作者机构：School of Physics&State Key Laboratory of Optoelectronic Materials and TechnologiesSun Yat-sen UniversityGuangzhou 510275China 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2024年第12卷第3期

页      面：444-455页

核心收录：

学科分类：08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：National Key Research and Development Program of China(2022YFA1404304) National Natural Science Foundation of China(12074443,12374364,62035016) Guangdong Basic and Applied Basic Research Foundation(2023B1515040023) Fundamental Research Funds for the Central Universities Sun Yat-sen University(23lgbj021) 

主　　题：translation dimensions corner 

摘      要：Second-order topological photonic crystals support localized corner modes that deviate from the conventional bulk-edge ***,the frequency shift of corner modes spanning the photonic band gap has not been experimentally ***,we observe the gapless corner modes of photonic crystal slabs within a parameter space by considering translation as an additional synthetic *** corner modes,protected by topological pumping in synthetic translation dimensions,are found to exist independently of the specific corner *** gapless corner modes are experimentally imaged via the near-field scanning measurement and validated numerically by full-wave *** propose a topological rainbow with gradient translation,demonstrating the ability to extract and separate specific frequency components of light into different spatial *** work contributes to the advancement of topological photonics and provides valuable insights into the exploration of gapless corner modes in synthetic dimensions.