期刊
NANO LETTERS
卷 16, 期 11, 页码 7229-7234出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b03626
关键词
Metasurface; polarization-insensitive metalenses; visible wavelength; titanium dioxide
类别
资金
- Air Force Office of Scientific Research (MURI) [FA9550-14-1-0389, FA9550-16-1-0156]
- Thorlabs Inc.
- Ministry of Science and Technology, Taiwan [104-2917-I-564-058]
- Charles Stark Draper Fellowship
- National Science Foundation [1541959]
- Harvard SEAS
- A*STAR Singapore
In this Letter, we demonstrate highly efficient, polarization-insensitive planar lenses (metalenses) at red, green, and blue wavelengths (lambda = 660, 532, and 405 nm). Metalenses with numerical apertures (NA) of 0.85 and 0.6 and corresponding efficiencies as high as 60% and 90% are achieved. These metalenses are less than 600 nm-thick and can focus incident light down to diffraction-limited spots as small as similar to 0.64 lambda and provide high-resolution imaging. In addition, the focal spots are very symmetric with high Strehl ratios. The single step lithography and compatibility with large-scale fabrication processes make metalenses highly promising for widespread applications in imaging and spectroscopy.
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