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Ying-Dong Nie 《中国物理 B》2023,32(1):18702-018702
Owing to the good adjustability and the strong near-field enhancement, surface plasmons are widely used in optical force trap, thus the optical force trap can achieve excellent performance. Here, we use the Laguerre-Gaussian beam and a plasmonic gold ring to separate enantiomers by the chiral optical force. Along with the radial optical force that traps the particles, there is also a chirality-sign-sensitive lateral force arising from the optical spin angular momentum, which is caused by the interaction between optical orbit angular momentum and gold ring structure. By selecting a specific incident wavelength, the strong angular scattering and non-chiral related azimuthal optical force can be suppressed. Thus the chiral related azimuthal optical force can induce an opposite orbital rotation of the trapped particles with chirality of different sign near the gold ring. This work proposes an effective approach for catchingand separating chiral enantiomers. 相似文献
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从衍射与波前相位变换的基本原理出发,介绍了傅里叶后焦面成像的基本原理,包括菲涅耳衍射与夫琅禾费衍射的傅里叶分光本质以及薄透镜的相位变换,给出了薄透镜满足严格傅里叶变换的条件,利用夫琅禾费衍射公式简单从远场可接受信息的角度讨论了衍射极限存在的原因.介绍了近代无限远光学显微镜以及无限远光学系统的物镜、结像透镜等元件所满足的傅里叶变换的条件以及在无限远光学显微镜上搭建傅里叶后焦面成像装置.最后,介绍了近年来在纳米光子学前沿研究的应用及相关展望. 相似文献
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On the assumption that the resonant surface plasmons on a spherical nanoparticle are formed by standing waves of two counter-propagating surface plasmon waves along the surface, by using Mie theory simulation, we find that the dispersions of surface plasmon resonant modes supported by silver nanospheres match with those of the surface plasmons on a semiinfinite medium-silver interface very well. This suggests that the resonant surface plasmons of a metal nanosphere can be treated as a propagating surface plasmon wave. 相似文献
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Benefiting from the induced image charge on film surface,the nanoparticle aggregating on metal exhibits interesting optical properties.In this work,a linear metal nanoparticle trimer on metal film system has been investigated to explore the novel optical phenomenon.Both the electric field and surface charge distributions demonstrate the light is focused on film greatly by the nanoparticles at two sides,which could be strongly modulated by the wavelength of incident light.And the influence of nanoparticle in middle on this light focusing ability has also been studied here,which is explained by the plasmon hybridization theory.Our finding about light focusing in nanoparticle aggregating on metal film not only enlarges the novel phenomenon of surface plasmon but also has great application prospect in the field of surface-enhanced spectra,surface catalysis,solar cells,water splitting,etc. 相似文献
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