Another breakthrough! The new lens can eliminate all visible color

In the Ministry of science and technology academic top supported by the lens research center of Applied Science Central Research Institute and National Taiwan University Cai Dingping fellow team to break through! The latest research team confirmed and produced can eliminate color difference of the entire visible spectrum of metamaterials (Achromatic Meta-lens) moment for the lens, and successfully applied to color imaging system. The research results have been published in January 29th by the international journal "Nature Nanotechnology" (Nature Nanotechnology).

Application of lens in daily life is quite wide, from the optical telescope, the camera and the camera sensor to the mobile phone, and endoscopic imaging system. However, limited by the refractive optical material rate, volume is usually thicker, and the refractive index of optical materials can vary with wavelength difference of light, resulting in color, lens in full color image application is thus limited.

Meta interface (metasurfaces) is a kind of optical structure design in subwavelength scale control electromagnetic Potter such as phase, amplitude and polarization of the miniature photoelectric element, can. Past studies have been successfully using metamaterials interface display planar metamaterials (flat, meta-lens) lens lens lens that metamaterials imaging ability is better than the widely used. However, the design method in the practical application level still faces some important problems, such as the chromatic dispersion.

The broadband achromatic lens optical metamaterials and electron microscope photos.

Cai Dingping distinguished research fellow and research team in 2017 has been successfully developed to eliminate the near infrared (480nm) metamaterials lens chromatic aberration. This further use of semiconductor materials Gan, combining the geometric phase (Geometric phase) "and" integrated control own concept of resonance unit ", successfully designed to eliminate all visible light transmissive color metamaterials lens.

Different from the traditional achromatic lens group, metamaterials moment for the lens using a single layer design that can eliminate the color difference. To eliminate the lens focusing effect in a wide frequency range of color in small volume, light electric device development of plane type is very important. As a result, it can reduce the thickness of the optical system, and the design process is more convenient, very practical application value.

The color image using visible light broadband achromatic lens shooting metamaterials.

This research is one of the international nano optics and optoelectronic field of important progress, also have great help to the future development of planar optical element is light and thin, many workers.

Source: Science News

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