Optical anisotropy of Bi 2 SeO 5 and near-field characterization of its waveguide modes
Source abstract
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.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: 2D Materials and Applications · Topological Materials and Phenomena · Advanced Semiconductor Detectors and Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
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
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
Shandong Key Laboratory of Intelligent Energy Materials, School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China
Peking University Yangtze Delta Institute of Optoelectronics, Nantong, Jiangsu 226010, P. R. China
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, P. R. China
Hefei National Laboratory, Hefei 230088, P. R. China
School of Physics, Shandong Jianzhu University, Jinan 250100, Shandong, P. R. China
Funding
National Basic Research Program of China · National Natural Science Foundation of China
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