Journal
ACS PHOTONICS
Volume 8, Issue 8, Pages 2294-2303Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.1c00411
Keywords
super-resolution metalens; achromatic metalens; subwavelength focusing; hologram
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Funding
- National Natural Science Foundation of China [61875042, 61927818]
- Chongqing Natural Science Foundation of Innovative Research Groups [cstc2020jcyj-cxttX0005]
- Fundamental Research Funds for the Central Universities [10611CDJXZ238826]
- Youth Innovation Promotion Association CAS [2015030]
- CAS Key Technology Talent Program
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In this paper, a holographic approach for achieving multiwavelength achromatic subwavelength super-resolution focusing is proposed, and a high-numerical-aperture achromatic super-resolution metalens is demonstrated at five different wavelengths. This method shows potential value in super-resolution related applications.
Optical super-resolution diffractive metalenses have been promising candidates for realizing optical imaging and a microscope beyond the Abbe diffraction limit. An achromatic super-resolution metalens is particularly important for practical applications; however, it remains challenging to achieve high-numerical-aperture achromatic super-resolution metalens for subwavelength focusing. Herein, a holographic approach of realizing a multiwavelength achromatic subwavelength superresolution focusing is proposed. Through wavefront engineering and holographic synthesis, a high-numerical-aperture achromatic super-resolution metalens is demonstrated for subwavelength super-resolution focusing at five different wavelengths of 520, 555, 632.8, 660, and 690 nm. Broadband achromatic performance is also expected. Generally, there is no theoretical limit on the numbe of achromatic wavelengths. The proposed method could be useful in super-resolution related applications, including imaging, microscopy, and data storage.
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