Optical anisotropy of Bi2SeO5 and near-field characterization of its waveguide modes

Jinglin Tang; Yaolong Li; Jingyue Wang; Yongchao Zhu; Xiaofang Li; Pengzuo Jiang; Jingying Xiao; Yuxin Zhang; Qinyun Liu; Minghao Deng; Guanyu Zhang; Zini Cao; Shufeng Wang; Hong Yang; Xiaoyong Hu; Han Gao; Hailin Peng; Guowei Lyu; Qihuang Gong

doi:10.1039/D5NR00839E

Optical anisotropy of Bi₂SeO₅ and near-field characterization of its waveguide modes†

Jinglin Tang,^a Yaolong Li,*^a Jingyue Wang,*^bc Yongchao Zhu,

^b Xiaofang Li,^a Pengzuo Jiang,^a Jingying Xiao,^a Yuxin Zhang,^a Qinyun Liu,^a Minghao Deng,^a Guanyu Zhang,^a Zini Cao,^a Shufeng Wang,

^ade Hong Yang,^ade Xiaoyong Hu,

*^adef Han Gao,*^g Hailin Peng,*^b Guowei Lyu

*^ade and Qihuang Gong^adef

Author affiliations

* Corresponding authors

^a State Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter & Frontiers Science Center for Nano-optoelectronics, Peking University, Beijing 100871, P. R. China
E-mail: yaolong@pku.edu.cn, xiaoyonghu@pku.edu.cn, guowei.lu@pku.edu.cn

^b Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences, Academy for Advanced Interdisciplinary Studies, College of Chemistry and Molecular Engineering, Peking University, Beijing, P. R. China
E-mail: jingyue_wang@upc.edu.cn, hlpeng@pku.edu.cn

^c Shandong Key Laboratory of Intelligent Energy Materials, School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China

^d Peking University Yangtze Delta Institute of Optoelectronics, Nantong, Jiangsu 226010, P. R. China

^e Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, P. R. China

^f Hefei National Laboratory, Hefei 230088, P. R. China

^g School of Physics, Shandong Jianzhu University, Jinan 250100, Shandong, P. R. China
E-mail: gaohan22@sdjzu.edu.cn

Abstract

Anisotropic van der Waals (vdW) materials have attracted increasing attention in nanophotonics due to their unique optical properties. As a stable vdW material with a high dielectric constant (κ) and a wide bandgap, Bi₂SeO₅ shows significant potential for semiconductor applications, but its optical properties have not been extensively studied. In this work, we first measured the refractive index of Bi₂SeO₅ using an imaging spectroscopic ellipsometer and revealed its in-plane and out-of-plane anisotropy. Then, we studied the planar waveguide modes supported by Bi₂SeO₅ flakes using photoemission electron microscopy (PEEM), showing good agreement with theoretical results of anisotropic waveguides. Near-field modes excited by ring slits were also studied and were significantly different from the simulated modes of isotropic materials. These results confirm the anisotropy of Bi₂SeO₅, suggesting its potential applications in nanophotonic and photoelectronic devices.

Nanoscale

Optical anisotropy of Bi₂SeO₅ and near-field characterization of its waveguide modes†

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Optical anisotropy of Bi₂SeO₅ and near-field characterization of its waveguide modes

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