[Chaos-l] flat lenses

[Alexey Toptygin]

On Mon, 27 Aug 2012, Michael Hrivnak wrote:

> https://www.seas.harvard.edu/news-events/press-releases/flat-lens-offers-perfect-image

It only works on one wavelength. As the article says:

> The array of nanoantennas, dubbed a metasurface, can be tuned for 
> specific wavelengths of light by simply changing the size, angle, and 
> spacing of the antennas.

Meaning if you want to focus another wavelength, you manufacture a new 
lens with different properties. Works great in telecom, not great for 
astronomy, unless you're building a telescope that only investigates a 
single wavelength like H-a or O-III...

 			Alexey