[Chaos-l] flat lenses

[Robert Nielsen]

Alexey,

OK ... having a degree in physics (which I haven't used in a long time) ... it seems to me that you could focus more than one wavelength at the same time, by putting different sets of nano antennas, sorta like your cell phone has a fractal antenna that receives multiple frequencies at the same time.   But they would be discrete, specific wavelengths ... so you still wouldn't get the same view as with a normal refractor.  But perhaps you could pick up multiple wavelengths, like a UHC filter ...

Robert

Sent from my iPad

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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