US Patent Issued to Peking University on April 21 for "Topological bulk laser and method based on band inversion and reflection of optical field" (Chinese Inventors)

ALEXANDRIA, Va., April 21 -- United States Patent no. 12,609,509, issued on April 21, was assigned to Peking University (Beijing).

"Topological bulk laser and method based on band inversion and reflection of optical field" was invented by Renmin Ma (Beijing), Zengkai Shao (Beijing) and Huazhou Chen (Beijing).

According to the abstract* released by the U.S. Patent & Trademark Office: "A topological bulk laser includes a topological photonic crystal (32) having an energy band inversion between dipole mode and quadrupole mode near the center of Brillouin zone and a trivial photonic crystal (31) not having band inversion for splicing to each other. The reflection and confinement of an optical field occurs at the interface; and the interface e...