期刊
ADVANCED OPTICAL MATERIALS
卷 8, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201901885
关键词
dielectric metalenses; off-axis focusing; superoscillation; super-resolution
资金
- National Natural Science Foundation of China [61927818, 61575031, 31971290, 61875042]
- National Basic Research Program of China (Program 973) [2013CBA01700]
- Fundamental Research Funds for the Central Universities [10611CDJXZ238826]
- Youth Innovation Promotion Association CAS [2015030]
- CAS Key Technology Talent Program
Recently, developments in superoscillatory optical devices have allowed for label-free far-field optical super-resolution technology by allowing engineering of optical point-spread functions beyond the traditional Abbe diffraction limit. However, such superoscillatory optical devices are optimized for the normal-incident operation, which inevitably leads to a comparatively slow imaging acquisition rate in the application of super-resolution microscopy. Here, a super-resolution metalens is demonstrated with a high numerical aperture that can focus oblique incident light into a hot spot with a size smaller than the diffraction limit at the visible wavelength. This super-resolution metalens has a numerical aperture of as large as 0.97, a focal length of 38.0 mu m, a radius of 151.9 mu m, and a field of view of 4 degrees that enables super-resolution focusing on the focal plane at a wavelength of lambda = 632.8 nm. In a 5.6 lambda x 5.6 lambda field of view on the focal plane, the size of the focal spot is smaller than 0.45 lambda, which is only 0.874 times the corresponding Abbe diffraction limit. The super-resolution metalens offers a promising way toward fast-scanning label-free far-field super-resolution microscopy.
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