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    nanopillars tagged posts

    The Metalens meets the Stars – Large, All-glass Metalens Images Sun, Moon and Nebulae

    January 20, 2024, Categories  Astronomy/Space, Physics

    image of the metalens and camera
    This 10-centimeter-diameter glass metalens can image the sun, the moon and distant nebulae with high resolution. (Credit: Capasso Lab/Harvard SEAS)
     

    Metalenses have been used to image microscopic features of tissue and resolve details smaller than a wavelength of light. Now they are going bigger.

    Researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have developed a 10-centimeter-diameter glass metalens that can image the sun, the moon and distant nebulae with high resolution.

    It is the first all-glass, large-scale metalens in the visible wavelength that can be mass produced using conventional CMOS fabrication technology.

    The research is published in ACS Nano.

    “The ability to accurately control the size of tens of billions of nanopill...

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    Sculpting Super-fast Light Pulses

    May 5, 2019, Categories  Physics, Technology/Electronics

    Schematic shows a novel technique to reshape the properties of an ultrafast light pulse. An incoming pulse of light (left) is dispersed into its various constituent frequencies, or colors, and directed into a metasurface composed of millions of tiny silicon pillars and an integrated polarizer. The nanopillars are specifically designed to simultaneously and independently shape such properties of each frequency component as its amplitude, phase or polarization. The transmitted beam is then recombined to achieve a new shape-modified pulse (right).
    Credit: S. Kelley/NIST

    Nanopillars shape light precisely for practical applications...

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