ALEXANDRIA, Va., June 12 -- United States Patent no. 12,298,529, issued on May 13, was assigned to NORTHROP GRUMMAN SYSTEMS Corp. (Falls Church, Va.).
"Spectrally-selective optical element" was invented by Kevin J. Romero (Claremont, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical element includes a first optical material structure comprising a first index of refraction across a frequency spectrum. The optical element also includes a second optical material structure configured to exhibit an index anomaly corresponding to a change in index of refraction from the first index of refraction to a second index of refraction across a portion of the frequency spectrum and a change from the second i...