计算物理 ›› 2007, Vol. 24 ›› Issue (4): 475-479.

• 论文 • 上一篇    下一篇

梯度分布球颗粒复合介质的介电特性和光吸收特性

谢秉川1, 沈廷根1, 吴亚敏2, 何勤1   

  1. 1. 江苏大学物理系, 江苏 镇江 212013;
    2. 江南大学物理系, 江苏 无锡 214000
  • 收稿日期:2006-02-23 修回日期:2006-08-14 出版日期:2007-07-25 发布日期:2007-07-25
  • 作者简介:谢秉川(1962-),男,江苏宜兴,副教授,主要从事凝聚态材料性质数值模拟方面的研究.
  • 基金资助:
    江苏省自然科学基金(BK2004059)资助项目

Dielectric Characteristic and Optical Absorption of Composite Media:Graded Spherical Particles

XIE Bingchuan1, SHEN Tinggen1, WU Yamin2, HE Qin1   

  1. 1. Department of Physics, Jiangsu University, Zhenjiang 212013, China;
    2. Department of Physics, Jiangnan University, Wuxi 214000, China
  • Received:2006-02-23 Revised:2006-08-14 Online:2007-07-25 Published:2007-07-25

摘要: 研究球形颗粒复合介质沿颗粒半径方向有梯度分布的有效介电响应和光吸收性质,利用微分有效偶极距近似方法计算有梯度分布球颗粒的等效介电常数.数值计算结果表明,对于一般的球形粒子,介电常数随半径按幂指数规律变化时,系统的有效介电常数随指数n的增大而减小;而对金属球形粒子,则存在等离子体共振吸收峰,且随参数mωmν的增大,其位置将发生红移.这为复合材料的制备提供了一种新的理论依据.

关键词: 复合介质, 有效响应, 梯度分布

Abstract: We apply effective dipole approximation to investigate the equivalent dielectric constant of inclusion and the effective response and optical absorption in composites media of metal spherical particles.The dielectric constant varies along the radius of the particles.εe exhibits a monotonic decrease with the power index n while the dielectric constant shows a power law gradation.The presence of the gradation in metal particles yields a resonant optical absorption peak.It shows red-shift with mω and mν of the metal-dielectric composites.

Key words: composite media, effective response, gradation profile

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