US 11,693,153 B2
Omnidirectional and thermally durable infrared reflectors, and methods for making the same
Shanying Cui, Calabasas, CA (US); Sean M. Meenehan, Sherman Oaks, CA (US); Tobias A. Schaedler, Oak Park, CA (US); and Phuong Bui, Thousand Oaks, CA (US)
Assigned to HRL Laboratories, LLC, Malibu, CA (US)
Filed by HRL Laboratories, LLC, Malibu, CA (US)
Filed on Aug. 11, 2020, as Appl. No. 16/990,096.
Claims priority of provisional application 62/940,294, filed on Nov. 26, 2019.
Prior Publication US 2021/0157031 A1, May 27, 2021
Int. Cl. G02B 1/00 (2006.01); G02B 5/10 (2006.01)
CPC G02B 1/005 (2013.01) [G02B 5/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An omnidirectional infrared reflector comprising a three-dimensional photonic crystal containing:
rods of a first material that has a first refractive index, wherein said rods are arranged to form a plurality of lattice periods that are periodic in all three dimensions, wherein said rods are connected at a plurality of nodes, wherein said lattice periods are characterized by a lattice spacing, and wherein said rods are characterized by a rod radius or width; and
a second material that has a second refractive index that is lower than said first refractive index, wherein said rods are embedded in said second material,
wherein said lattice spacing and said rod radius or width are selected to produce a photonic band gap within a selected band of the infrared spectrum.