According to the Reuters under the Ministry of Science academic program support top attack, then break for Applied Scientific Research, Academia Sinica research center Caiding Ping Distinguished Research Fellow and National Taiwan University team lenses! Team confirmed the latest research and produce can eliminate the entire visible band of color Achromatic Meta-lens is successfully applied to full color imaging systems. The research results were published in the international journal Nature Nanotechnology on January 29.
Lenses are used in everyday life, from glasses, optical telescopes, photographic lenses and camera sensing components to cell phones, endoscopes, and imaging systems. However, limited by the refractive index of the optical material, the volume is usually thicker, and the refractive index of the optical material changes with the wavelength difference of the light, thereby causing chromatic aberration, and the lens is thus greatly limited in full-color image application.
Metasurfaces are optical design structures that manipulate electromagnetic wave characteristics such as phase, amplitude, and polarization at sub-wavelength scales to miniaturize optoelectronic components. Previous studies have successfully used the super-interface to display flat meta-lens, which proves that the imaging ability of the super-lens lens is better than that of the currently widely used objective lens. However, the design method still faces several important issues at the practical application level, such as the chromatic aberration caused by dispersion.
Optical photo and electron micrograph of broadband achromatic super-lens
Cai Dingping's specially recruited researchers and research team have successfully developed a super-lens lens that can eliminate the chromatic aberration in the near-infrared band (480 nm) in 2017. This year, the semiconductor material GaN was further utilized, and the "Geometric phase" control and the self-contained concept "integrated resonance unit" were successfully used to successfully design a transmissive super-lens lens that eliminates the chromatic aberration in the full visible light band.
Different from the traditional achromatic optical lens group, the super-engrave lens uses a single layer design to eliminate chromatic aberration. The focusing effect of eliminating the chromatic aberration of the lens in a wide frequency band in a very small volume is critical to the development of a planar micro-optical device. In this way, the thickness of the optical system can be reduced, and the design and the process are also simpler and more practical.
Color image taken with visible broadband achromatic achromatic lens
The research results are one of the important advances in the field of international nano optics and optoelectronics, and will also greatly contribute to the development of light, thin and multiplexed planar optical components in the future.
Editor: Yan Zhixiang
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