Scientists have constructed functional metalenses that are one-tenth to one-half the thickness of the wavelengths of light that they focus. Their metalenses, which were constructed out of layered 2D materials, were as thin as 190 nanometers – less than 1/100,000ths of an inch thick.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2018/11/181114104024.htm
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