[Chaos-l] flat lenses

[Terry Crook]

Critical point!  Thx, Alexey.

Taurus Terry in Chapel Hill
35° 55' 47"N, 79° 01' 00"W


On 8/27/2012 11:43 AM, Alexey Toptygin 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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