Journal
NANOMATERIALS
Volume 12, Issue 19, Pages -Publisher
MDPI
DOI: 10.3390/nano12193485
Keywords
superoscillation; vector beam; metalens; polarization; diffraction
Categories
Funding
- National Natural Science Foundation of China [12174309, 11634010, 91850118, 11774289]
- National Key Research and Development Program of China [2017YFA0303800]
- Natural Science Basic Research Program of Shaanxi [2021JQ-895, 2020JM-104]
- Fundamental Research Funds for the Central Universities [3102019JC008]
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This paper proposes a dielectric metalens for superoscillatory focusing based on the diffraction of angular Bessel functional phase modulated vector field, providing a new solution for optical far-field label-free super-resolution imaging.
The phenomenon of optical superoscillation provides an unprecedented way to solve the problem of optical far-field label-free super-resolution imaging. Numerous optical devices that enable superoscillatory focusing were developed based on scalar and vector diffraction theories in the past several years. However, these reported devices are designed according to the half-wave zone method in spatial coordinates. In this paper, we propose a dielectric metalens for superoscillatory focusing based on the diffraction of angular Bessel functional phase modulated vector field, under the inspiration of the tightly autofocusing property of a radially polarized high-order Bessel beam. Based on this kind of metalens with a numerical aperture (NA) of 0.9, the linearly polarized light is converted into a radially polarized one and then focus into a superoscillating focal spot with the size of 0.32 lambda/NA. This angular spectrum modulation theory involved in this paper provides a different way of designing superoscillatory devices.
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