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Super-resolution imaging of low-contrast periodic nanoparticle arrays by microsphere-assisted microscopy |
Qin-Fang Shi(石勤芳)1, Song-Lin Yang(杨松林)2, Yu-Rong Cao(曹玉蓉)1, Xiao-Qing Wang(王晓晴)1, Tao Chen(陈涛)3,†, and Yong-Hong Ye(叶永红)1,‡ |
1 Department of Physics, Nanjing Normal University, Nanjing 210023, China; 2 Advanced Photonics Center, Southeast University, Nanjing 210096, China; 3 Jiangsu Provincial Key Laboratory of Advanced Robotics, Soochow University, Suzhou 215123, China |
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Abstract 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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Received: 05 September 2020
Revised: 26 October 2020
Accepted manuscript online: 01 December 2020
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PACS:
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07.60.Pb
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(Conventional optical microscopes)
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42.79.Bh
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(Lenses, prisms and mirrors)
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87.64.M-
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(Optical microscopy)
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61673287). |
Corresponding Authors:
†Corresponding author. E-mail: chent@suda.edu.cn ‡Corresponding author. E-mail: yeyonghong@njnu.edu.cn
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Cite this article:
Qin-Fang Shi(石勤芳), Song-Lin Yang(杨松林), Yu-Rong Cao(曹玉蓉), Xiao-Qing Wang(王晓晴), Tao Chen(陈涛), and Yong-Hong Ye(叶永红) Super-resolution imaging of low-contrast periodic nanoparticle arrays by microsphere-assisted microscopy 2021 Chin. Phys. B 30 040702
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