ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,542,421, issued on Feb. 3, was assigned to NTT INC. (Tokyo).
"Optical device" was invented by Takuma Tsurugaya (Tokyo), Shinji Matsuo (Tokyo), Koji Takeda (Tokyo) and Takuro Fujii (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical device includes a first reflecting section, a second reflecting section, and a confining section. The first reflecting section is constituted of a thin-wire waveguide-type one-dimensional photonic crystal. The second reflecting section is constituted of a thin-wire waveguide-type one-dimensional photonic crystal of which a lattice constant differs from that of the first reflecting section. The confining section is...