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

IF 5.1 3区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nanoscale Pub Date : 2025-07-22 DOI:10.1039/d5nr00839e

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

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引用次数: 0

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.

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Bi2SeO5的光学各向异性及其波导模式的近场特性

各向异性范德瓦尔斯（vdW）材料由于其独特的光学性质在纳米光子学领域受到越来越多的关注。作为一种具有高介电常数（κ）和宽带隙的稳定vdW材料，Bi2SeO5在半导体领域显示出巨大的应用潜力，但其光学性质尚未得到广泛的研究。在这项工作中，我们首先使用成像光谱椭偏仪测量了Bi2SeO5的折射率，并揭示了其面内和面外各向异性。然后，我们利用光电电子显微镜（PEEM）研究了Bi2SeO5薄片支撑的平面波导模式，结果与各向异性波导的理论结果吻合良好。环形狭缝激发的近场模态与各向同性材料的模拟模态有显著差异。这些结果证实了Bi2SeO5的各向异性，表明其在纳米光子和光电子器件中的潜在应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nanoscale CHEMISTRY, MULTIDISCIPLINARY-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

12.10

自引率

3.00%

发文量

1628

审稿时长

1.6 months

期刊介绍： Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers.Highly interdisciplinary, this journal appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics.