It is suggested that a material with a novel spatial dielectric distribution can exhibit a bandgap that is approximately independent of propagation angle. This independence is accomplished by development of the dielectric constant from reflection vectors of equal strength that are ideally equispaced in angle.
© 1999 Optical Society of America
Peter L. Hagelstein and Douglas R. Denison, "Nearly isotropic photonic bandgap structures in two dimensions," Opt. Lett. 24, 708-710 (1999)