[HN Gopher] Researchers develop a flat metalens that can change ...
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       Researchers develop a flat metalens that can change its focal
       length
        
       Author : bookofjoe
       Score  : 26 points
       Date   : 2023-11-22 17:50 UTC (5 hours ago)
        
 (HTM) web link (petapixel.com)
 (TXT) w3m dump (petapixel.com)
        
       | ChuckMcM wrote:
       | I just want flat lenses for my glasses :-)
       | 
       | A very very long time ago the lab adjacent to the one I worked in
       | was investigating if light passing through a holographic lens was
       | bent in the same way as light traveling through a physical
       | lens[1]. It was a super neat idea at the time. That was long
       | before the whole meta-material craze hit.
       | 
       | [1] https://ieeexplore.ieee.org/abstract/document/1457205
        
       | Vecr wrote:
       | To FwarkTheNark, it's a meta material lens, hence metalens.
        
       | zardo wrote:
       | It sounds like the lens doesn't change it's focal length, but the
       | focal length is a function of the light polarization. So you can
       | just rotate a polarizing filter to change the focal length.
        
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       (page generated 2023-11-22 23:02 UTC)