表面吸收通道中的光吸收由二维材料包覆的粒子

IF 1.8 4区 物理与天体物理 Q3 OPTICS
Shangyu Zhang, Jian Dong, Wenjie Zhang, Lanxin Ma, LINHUA LIU
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引用次数: 0

摘要

在电磁边界条件下,通过表面电导率和表面电流的物理均匀化,微粒子和纳米粒子的光吸收增强已经引起了相当大的关注。然而,通过表面通道的电磁吸收仍然未被研究,阻碍了对光吸收潜在机制的更深入理解。在这项工作中,我们基于Mie理论的框架,通过表面电导率修正,解析导出了二维材料涂层球体的有效表面吸收截面。我们的理论分析证实了包裹粒子的吸收统一性,即总吸收等于表面吸收和体积吸收的总和。考虑到极性内部的光学色散,我们确定了二维涂层引起的共振波长蓝移,这导致材料耗散减少,从而减少了颗粒内部的体积吸收,尽管颗粒内部的场增强很大。最后,通过一个实际的小石墨烯包裹MgO球的例子,我们说明了表面吸收通道在吸收增强机制中的主导作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Surface absorption channels in light absorption by a 2D-material coated particle
Light absorption enhancement in micro- and nanoparticles has garnered considerable attention through coated 2D materials, which are physically homogenized by surface conductivities and surface currents within the electromagnetic boundary conditions. However, the electromagnetic absorption through the surface channel remains unexamined, hindering a deeper understanding of the underlying mechanisms of light absorption. In this work, we analytically derive the effective cross sections of surface absorption for a 2D-material-coated sphere, based on the framework of Mie theory amended by the surface conductivity. Our theoretical analysis confirms the absorption unitarity in wrapped particles, whereby the total absorption is equivalent to the sum of surface and volume absorptions. Considering optical dispersion of a polar interior, we identify a blue shift in the resonance wavelength induced by the 2D coating, which leads to a decrease in material dissipation and thus volume absorption within the particle itself in spite of a large field enhancement inside the particle. Finally, through a realistic case of small graphene-wrapped MgO spheres, we illustrate the dominant role of the surface absorption channel on the mechanism of absorption enhancements.
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来源期刊
CiteScore
4.00
自引率
5.30%
发文量
374
审稿时长
2.1 months
期刊介绍: The Journal of the Optical Society of America B (JOSA B) is a general optics research journal that complements JOSA A. It emphasizes scientific research on the fundamentals of the interaction of light with matter such as quantum optics, nonlinear optics, and laser physics. Topics include: Advanced Instrumentation and Measurements Fiber Optics and Fiber Lasers Lasers and Other Light Sources from THz to XUV Light-Induced Phenomena Nonlinear and High Field Optics Optical Materials Optics Modes and Structured Light Optomechanics Metamaterials Nanomaterials Photonics and Semiconductor Optics Physical Optics Plasmonics Quantum Optics and Entanglement Quantum Key Distribution Spectroscopy and Atomic or Molecular Optics Superresolution and Advanced Imaging Surface Optics Ultrafast Optical Phenomena Wave Guiding and Optical Confinement JOSA B considers original research articles, feature issue contributions, invited reviews and tutorials, and comments on published articles.
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