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METHODS AND APPARATUS FOR BROADBAND ANGULAR SELECTIVITY OF ELECTROMAGNETIC WAVES

United States Patent Application

20160252652
A1
View the Complete Application at the US Patent & Trademark Office
A filter to transmit incident radiation at a predetermined incidence angle includes a plurality of photonic crystal structures disposed substantially along a surface normal direction of the filter. The photonic crystal structure includes a multilayer cell that comprises a first layer having a first dielectric permittivity, and a second layer having a second dielectric permittivity different from the first dielectric permittivity. The first layer and the second layer define a Brewster angle substantially equal to the predetermined incidence angle based on the first dielectric permittivity and the second permittivity. Each photonic crystal structure in the plurality of photonic crystal structures defines a respective bandgap, and the respective bandgaps of the plurality of photonic crystal structures, taken together, cover a continuous spectral region of about 50 nm to about 100 mm.
Shen, Yichen (Cambridge, MA), Ye, Dexin (Hangzhou, CN), Celanovic, Ivan (Cambridge, MA), Johnson, Steven G. (Arlington, MA), Joannopoulos, John D. (Belmont, MA), Soljacic, Marin (Belmont, MA)
MASSACHUSETTS INSTITUTE OF TECHNOLOGY (Cambridge MA)
14/ 630,080
February 24, 2015
GOVERNMENT SUPPORT [0002] This invention was made with government support under Grant Nos. DE-FG02-09ER46577 and DE-SC0001299 awarded by the Department of Energy, and Contract No. W911NF-13-D-0001 awarded by the Army Research Office. The government has certain rights in the invention."