US 12,455,401 B2
Metasurface with overcoat and equal pillar spacing
Daniel Bacon-Brown, Sandy, UT (US); and Bradley R. Williams, Pocatello, ID (US)
Assigned to Moxtek, Inc., Orem, UT (US)
Filed by Moxtek, Inc., Orem, UT (US)
Filed on Feb. 21, 2023, as Appl. No. 18/112,152.
Claims priority of provisional application 63/332,352, filed on Apr. 19, 2022.
Prior Publication US 2023/0333282 A1, Oct. 19, 2023
Int. Cl. G02B 1/00 (2006.01)
CPC G02B 1/002 (2013.01) 20 Claims
OG exemplary drawing
 
1. A metasurface optical device comprising:
an array of pillars on a substrate, including different pillars with different diameters with respect to each other;
each pillar has a proximal-end nearest the substrate and a distal-end farthest from the substrate;
D5/D1≥2, where D5 is a diameter of a largest diameter pillar and D1 is a diameter of a smallest diameter pillar, both diameters D5 and D1 measured halfway between the proximal-end and the distal-end;
G1/G5≤1.5, where G1 is a gap between the smallest diameter pillar and a nearest adjacent pillar of the array, and G5 is a gap between the largest diameter pillar and a nearest adjacent pillar of the array, both gaps G1 and G5 measured halfway between the proximal-end and the distal-end;
P55/P11≥1.5, where P55 is a pitch between two of the largest pillars and P11 is a pitch between two of the smallest pillars, proximate to each other; and
an overcoat layer located at the distal-end of the pillars, the overcoat layer spanning gaps between the pillars.