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Super-resolution imaging of low-contrast periodic nanoparticle arrays by microsphere-assisted microscopy

Super-resolution imaging of low-contrast periodic nanoparticle arrays by microsphere-assisted microscopy

作     者:石勤芳 杨松林 曹玉蓉 王晓晴 陈涛 叶永红 Qin-Fang Shi;Song-Lin Yang;Yu-Rong Cao;Xiao-Qing Wang;Tao Chen;Yong-Hong Ye

作者机构:Department of PhysicsNanjing Normal UniversityNanjing 210023China Advanced Photonics CenterSoutheast UniversityNanjing 210096China Jiangsu Provincial Key Laboratory of Advanced RoboticsSoochow UniversitySuzhou 215123China 

出 版 物:《Chinese Physics B》 (中国物理B(英文版))

年 卷 期:2021年第30卷第4期

页      面:193-197页

核心收录:

学科分类:08[工学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0803[工学-光学工程] 0704[理学-天文学] 

基  金:Project supported by the National Natural Science Foundation of China(Grant No.61673287)。 

主  题:super-resolution microsphere optical microscopy surface plasmon polariton 

摘      要:We use the label-free microsphere-assisted microscopy to image low-contrast hexagonally close-packed polystyrene nanoparticle arrays with diameters of 300 and 250 nm.When a nanoparticle array is directly placed on a glass slide,it cannot be distinguished.If a 30-nm-thick Ag film is deposited on the surface of a nanoparticle array,the nanoparticle array with nanoparticle diameters of 300 and 250 nm can be distinguished.In addition,the Talbot effect of the 300-nm-diameter nanoparticle array is also observed.If a nanoparticle sample is assembled on a glass slide deposited with a 30-nm-thick Ag film,an array of 300-nm-diameter nanoparticles can be discerned.We propose that in microsphere-assisted microscopy imaging,the resolution can be improved by the excitation of surface plasmon polaritons(SPPs) on the sample surface or at the sample/substrate interface,and a higher near-field intensity due to the excited SPPs would benefit the resolution improvement.Our study of label-free super-resolution imaging of low-contrast objects will promote the applications of microsphere-assisted microscopy in life sciences.

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