Ah ha!
Glass lens manufacturers may be having their Kodak moment soon.
My great grandfather was a lens grinder until he fell into the machine and made a spectacle of himself.
“Shapes on the surface of this lens are smaller than the wavelength of light involved: a thousandth of a millimetre.”
I wonder why they chose to work in the near-infrared, rather than the visible.
Does this mean my coke-bottle eyeglasses may become obsolete?
how about scratches?
2mm? did they mean 2µm???
There is no way we are NOT in a trade situation with extraterrestrials, who are giving us technology.
----Discontinuous redirection
In 2011, however, Federico Capasso and colleagues at Harvard University showed that, if the phase of light waves could be changed discontinuously, the light could be redirected as desired using a flat surface. In their original work, this was achieved using resonant metallic antennas that interfered directly with the electric field of the light. But the antennae were difficult to manufacture and highly inefficient.
Researchers have since shown that phase discontinuities can also be imprinted by using tiny subwavelength elements made of silicon. These imprint a shift in the so-called Pancharatname–Berry phase of the light waves, by imparting a spatially dependent polarization shift as they pass through the elements. These elements are simpler to manufacture and focus transmitted visible light more efficiently, but they still absorb or reflect too much light to make a viable commercial lens.
Capasso's team has now developed a new technique to fabricate these tiny "nanofins", using electron beam lithography to pattern a resist before depositing a very thin layer of titanium oxide – which transmits visible wavelengths much better than silicon – onto the resist to produce the metasurface. The researchers used their technique to fabricate titanium-oxide metalenses designed to focus light at different visible wavelengths. Titanium nanofins
The focusing efficiencies of the lenses were unprecedented for visible-light metalenses: the lens designed for 405 nm (violet) light brought 86% of the incident light to a focus. The lenses also had much higher numerical apertures than previous metalenses, allowing them to focus light from a wider angle to a single spot. This in turn produced focal spots smaller than the light's wavelength, and smaller than those achievable with a state-of-the-art commercial objective containing multiple refractive lenses. ----
How about some one working on EYE GLASSES optics? Technology is archaic by today’s standards. As are Refraction’s. They get close to mine, but can NEVER get it right. I keep telling them the letters are blurred not clean or crisp.