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国家教育部博士点基金(200800011023)

作品数:3 被引量:11H指数:2
相关作者:姚昊旻李智龚旗煌更多>>
相关机构:北京大学更多>>
发文基金:国家教育部博士点基金国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:理学一般工业技术更多>>

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3 条 记 录,以下是 1-3
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Long-range surface plasmon polaritons with subwavelength mode expansion in an asymmetrical system被引量:2
2009年
Long-range surface plasmon polariton (LRSPP) modes in an asymmetrical system, in which the thin metal film is sandwiched between a semi-infinite substrate and a high permittivity polymer film with a finite thickness, are theoret~ ically calculated and analyzed. Due to the high permittivity of the polymer film, at proper polymer film thicknesses, the index-matching condition of the dielectrics at both sides of the metal can be satisfied for supporting LRSPP modes, and the electromagnetic field above the metal can be localized well. It is found that these LRSPP modes have both long propagation lengths and subwavelength mode expansion above the metal at the optimal polymer film thickncsses. Furthermore, the requirements on the refractive index and the thickness of the polymer film to support LRSPP modes at the optimal thicknesses are found to be not critical.
陈建军李智龚旗煌
Coupling-induced excitation of a forbidden surface plasmon mode of a gold nanorod被引量:8
2009年
Using the finite-difference time-domain(FDTD) method,we simulate the coupling between a gold nanorod and gold nanoparticles with different plasmonic resonant frequencies/volumes as well as that between the nanorod and a dielectric nanosphere.The influences of coupling with different nanoparticles on the excitation of a forbidden longitudinal surface plasmon mode of the nanorod under normal incidence are investigated.It is found that the cause of this excitation is the broken symmetry of the local electric field experienced by the nanorod resulting from the charge pileup on the other nanoparticle.This result is valuable for understanding the near-field optical characterization of plasmonic metal nanoparticles.
YAO HaoMinLI ZhiGONG QiHuang
关键词:LOCALIZEDPLASMONNEAR-FIELDMICROSCOPYSYMMETRYBREAKING
耦合诱导的金纳米棒禁戒等离激元模式激发被引量:1
2009年
用时域有限差分方法(finite-difference time-domain,FDTD)模拟了有不同局域等离激元共振频率和不同体积的外来金纳米颗粒以及外来介质纳米颗粒与金纳米棒的耦合,研究了正入射条件下与各种颗粒耦合对诱发金棒上纵向等离激元的禁戒模式的不同影响,发现外来颗粒上足够多的电荷积聚造成的电场对称性破缺是诱发禁戒模式的原因.这一发现对理解金属纳米颗粒的近场光学实验探测有重要意义.
姚昊旻李智龚旗煌
关键词:金纳米颗粒对称性破缺
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