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Three-dimensional periodic dielectric structures having photonic Dirac points

United States Patent

June 2, 2015
View the Complete Patent at the US Patent & Trademark Office
The dielectric, three-dimensional photonic materials disclosed herein feature Dirac-like dispersion in quasi-two-dimensional systems. Embodiments include a face-centered cubic (fcc) structure formed by alternating layers of dielectric rods and dielectric slabs patterned with holes on respective triangular lattices. This fcc structure also includes a defect layer, which may comprise either dielectric rods or a dielectric slab with patterned with holes. This defect layer introduces Dirac cone dispersion into the fcc structure's photonic band structure. Examples of these fcc structures enable enhancement of the spontaneous emission coupling efficiency (the .beta.-factor) over large areas, contrary to the conventional wisdom that the .beta.-factor degrades as the system's size increases. These results enable large-area, low-threshold lasers; single-photon sources; quantum information processing devices; and energy harvesting systems.
Bravo-Abad; Jorge (Madrid, ES), Joannopoulos; John D. (Belmont, MA), Soljacic; Marin (Belmont, MA)
Massachusetts Institute of Technology (Cambridge, MA)
13/ 769,954
February 19, 2013
GOVERNMENT SUPPORT This invention was made with Government support under Contract No. DE-SC0001299 awarded by the Department of Energy, Contract No. DMR-0819762 awarded by the National Science Foundation, and Contract No. W911NF-07-D0004 awarded by the Army Research Office. The Government has certain rights in this invention.