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.