Confined optical field based on surface plasmon polaritons and the interactions with nanospheres
Confined optical field based on surface plasmon polaritons and the interactions with nanospheres
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基于表面等离子体激元及其与纳米球相互作用的受限光场
DOI：
10.1364/josab.25.001096
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发表时间：
2008-07
影响因子：
1.9
通讯作者：
Wang, Qingyan
中科院分区：
文献类型：
--
作者：
Zhang, Shuhan;Wang, Jia;Wang, Qingyan
本文用时域有限差分方法模拟了一种表面等离子体极化子带隙结构，用于产生高强度、非常小副瓣的受限纳米光场。数值计算结果表明，约束场的强度增强可达到2个数量级，分辨率（零阶模的FWHM）为0.33λ，高阶模（旁瓣）被有效抑制到不超过15%。这些特性保证了受限场可以用作近场源。详细而系统地研究了增强和局部化与结构参数的关系，并解释了这些现象背后的物理机制。通过与不同类型纳米球的相互作用，讨论了约束场在近场探测和成像中的潜在应用。仿真结果表明，可以分辨出特征尺寸小至0.13λ的细节。
A type of surface-plasmon-polariton bandgap structure for generating a confined nanometric optical field with high intensity and very small sidelobes is simulated by using the finite-difference time-domain method. The numerical results show that the intensity enhancement of the confined field can reach 2 orders of magnitude, with a resolution (FWHM of the zero-order mode) of 0.33λ and the high-order modes (sidelobes) being effectively suppressed to no more than 15%. These properties ensure the confined field to be used as a near-field source. Detailed and systematic investigations of the enhancement and the localization versus the structure parameters are performed, and the physical mechanisms behind these phenomena are explained. Potential applications of the confined field in near-field detection and imaging are discussed through interactions with different types of nanospheres. The simulated results reveal that details with feature sizes down to 0.13λ can be resolved.
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