Microsphere-lens coupler with 100  nm lateral resolution accuracy in visible light

We propose a microsphere-lens coupler that can successfully constrain the beam with near-field details to achieve ∼ 100 n m lateral resolution accuracy. In theory, we use the finite-difference time-domain method to analyze the properties of the “photonic nanojet.” The optimal focusing ability scope...

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Bibliographic Details
Published in:Applied optics (2004) 2020-07, Vol.59 (20), p.6012
Main Authors: Miao, Yu, Gao, Xiumin, Wang, Guanxue, Li, Yang, Liu, Xuejing, Sui, Guorong
Format: Article
Language:English
Subjects:
Attenuation
Couplers
Deagglomeration
Dielectric properties
Finite difference time domain method
Lenses
Microspheres
Optical microscopes
Optimization
Refractivity
Tiling
Time domain analysis
Washing
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Summary:We propose a microsphere-lens coupler that can successfully constrain the beam with near-field details to achieve ∼ 100 n m lateral resolution accuracy. In theory, we use the finite-difference time-domain method to analyze the properties of the “photonic nanojet.” The optimal focusing ability scope can be obtained by adjusting the focusing parameters, such as refractive index, paraxial optical intensity attenuation ratio, sizes of microspheres, and so forth. In experiment, the “non-brush scrubbing” cleaning technology is adopted to optimize the experimental results. Aiming to self-assemble properties of dielectric spheres, we introduce the deagglomeration method to produce homogeneous liquid. Meanwhile, by tiling a 5 µm-diameter microsphere-lens on a specimen, a traditional optical microscope can realize 100 nm lateral superresolution microimaging, which lays a certain foundation for further development of superresolution microimaging.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.394038