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19 November 2019 Improved microsphere-assisted super-resolution imaging by plasmon coupling
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We propose a simple and effective method to improve the super-resolution imaging properties of a microsphere by combining plasmon coupling with the microsphere lens. Plasmon coupling can be excited when random silver nanoparticles are deposited on a self-assembled hexagonally closed-packed (hcp) SiO2 microsphere array. The electric field enhancement is found to be strongly influenced by plasmon coupling, and the enhanced near-field information of the samples can significantly affect the resolution quality. Using BaTiO3 glass (BTG) microsphere-assisted optical microscopy, we can clearly resolve a 200-nm-diameter hcp microsphere array when nanoparticle-nanoparticle plasmonic interactions and nanoparticle-thin film plasmonic interactions are excited. On the contrary, when there are no plasmon interactions excited, the 200-nm-diameter silver-coated hcp microsphere array is completely unresolved.
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Yurong Cao, Songlin Yang, Jianguo Wang, and Yong-Hong Ye "Improved microsphere-assisted super-resolution imaging by plasmon coupling", Proc. SPIE 11186, Advanced Optical Imaging Technologies II, 1118606 (19 November 2019);

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