Phys. Rev. Lett. 65, 3152–3155 (1990)Existence of a photonic gap in periodic dielectric structuresReceived 4 September 1990; published in the issue dated 17 December 1990 Using a plane-wave expansion method, we have solved Maxwell’s equations for the propagation of electromagnetic waves in a periodic lattice of dielectric spheres (dielectric constant εa) in a uniform dielectric background (εb). Contrary to experiment, we find that fcc dielectric structures do not have a ‘‘photonic band gap’’ that extends throughout the Brillouin zone. However, we have determined that dielectric spheres arranged in the diamond structure do possess a full photonic band gap. This gap exists for refractive-index contrasts as low as 2. © 1990 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.65.3152
DOI:
10.1103/PhysRevLett.65.3152
PACS:
71.25.Cx, 41.10.Hv, 84.90.+a
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