[Chaos-l] flat lenses

[Robert Nielsen]

Like my solar scope ... 

On Aug 27, 2012, at 11:43 AM, Alexey Toptygin <alexeyt at freeshell.org> wrote:

> 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
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