Flat lens - is this the breakthrough it seems to be?

Started Aug 12, 2013 | Discussions thread
alanr0
Senior MemberPosts: 1,260
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As noted previously
In reply to meanwhile, Aug 12, 2013

meanwhile wrote:

Could this be the product to finally disproves the whole "you can't beat physics" argument to lenses needing to be a particular size?

https://www.seas.harvard.edu/news/2012/08/flat-lens-offers-perfect-image

As discussed previously, physics still applies, and the technology is not quite ready for mainstream photographic applications.  As far as I can tell, the lens described is around 42 mm focal length, but only 1 mm diameter (so f:42).  As others have stated, it only works for a narrow band of wavelengths, and the silicon substrate will be opaque to visible light.

They have simulation results suggesting the technique can be applied to high numerical aperture microscope objectives.  However, it may be difficult to maintain low aberrations and high diffraction efficiency over a sufficiently wide field of view for more general purpose photography.

Cheers.

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Alan Robinson

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