US 11,747,639 B2
Birefringent waveplate and method for forming a waveplate having a birefringent metasurface
Eyal Feigenbaum, Livermore, CA (US); Jeffrey D. Bude, Danville, CA (US); Jean-Michel Di Nicola, Livermore, CA (US); Hoang T. Nguyen, Livermore, CA (US); and Christopher J. Stolz, Lathrop, CA (US)
Assigned to Lawrence Livermore National Security, LLC, Livermore, CA (US)
Filed by Lawrence Livermore National Security, LLC, Livermore, CA (US)
Filed on Jul. 22, 2019, as Appl. No. 16/518,500.
Prior Publication US 2021/0026150 A1, Jan. 28, 2021
Int. Cl. G02B 5/30 (2006.01); G02B 27/28 (2006.01); G02B 6/27 (2006.01)
CPC G02B 27/283 (2013.01) [G02B 5/3083 (2013.01); G02B 6/272 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A waveplate comprising:
a substrate forming an optic;
the substrate including an integral portion forming a plurality of angled columnar features on an exposed surface thereof, the plurality of angled columnar features forming a metasurface that extends partially into a thickness of the substrate;
each of the angled columnar features having a tapering wall that forms a non-uniform cross-sectional area over a length thereof;
the plurality of angled columnar features further being aligned parallel with a directional plane formed non-parallel to a reference plane, the reference plane being normal to a surface of the substrate, and such that the tapering wall of each said angled columnar feature is non-symmetrical along a first longitudinal axis of the substrate, and symmetrical along a second axis extending orthogonal to the first longitudinal axis; and
the metasurface forming a birefringent metasurface.