Affiliation:
1. School of Computer and Electronic Information, Nanjing Normal University, Nanjing 210023, China
2. Advanced Photonics Center, Southeast University, Nanjing 210096, China
Abstract
Here, we propose a method to fabricate large-scale optoplasmonic hybrid materials (OHMs) as a near-field illumination source for sub-diffraction imaging through a traditional optical microscope. An OHM is comprised of a metal/dielectric multilayer coated substrate and a microcylinder (MC) placed on top of the multilayer. Under the dark-field illumination of a traditional optical microscope, the photonic nanojet (PNJ) generated by the MC and the electric field produced on the substrate surface by the photonic–plasmonic interaction work as the near-field illumination source for an object placed on the substrate near the PNJ. High spatial frequencies of the object can be shifted to the passband of the optical microscope and weak scattering signals of the object can be enhanced upon the near-field illumination. Low-contrast objects, such as a 300-nm-diameter SiO2 nanoparticle array, two 100-nm-diameter polystyrene nanoparticles spaced ∼86 nm apart, and Escherichia coli can be resolved using the optical microscope. In addition, the field of view (FOV) is rectangular, the length of the FOV depends on the length of the MC, and the width relates to the diameter of the MC. The proposed method is wide-field, label-free, direct, noninvasive, and far-field, and it presents the potential of super-resolution imaging of unlabeled biological samples using a traditional optical microscope.
Funder
National Natural Science Foundation of China
Subject
Physics and Astronomy (miscellaneous)
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献