Recent content by HEM87

Oh yeah, it would be smooth, just a series of opaque and transparent sections on a smooth surface.

What do you mean by smooth? Planar?

The tear film lens effect behind the lens is pretty well understood (generally giving a +0.25 D addition per 0.05 mm difference between corneal curvature and back RGP lens curvature) and can be corrected for generally by providing an intrinsic correction in the lens.

Hi, I'm curious about using Fresbel zone plates implemented on contact lenses (RGP) for an alternative method of focusing. So yes, I'm looking to focus light at a certain point from a plane wave, thanks deadbeef, that's useful!

Hi there, The focal length of lens depends on curvature of the lens and the difference between the curved surfaces, as given by the lensmaker equation. \frac{1}{f} = (n-1)[\frac{1}{R_{1}} + \frac{1}{R_{2}} + \frac{(n-1)d}{nR_{1}R_{2}}] where f is the focal length of the lens, n is the...

Hi there, I'm wondering if anyone has any analysis or sources to help me understand how a Fresnel zone plate can be implemented on a curved surface, and the corresponding diffractive efficiency and focal length?? Thanks!