Andueza Unanua, Ángel MaríaEcheverría, R.Morales Zimmermann, Paola AndreaSevilla Moróder, Joaquín2018-12-282018-12-2820090021-8979 (Print)1089-7550 (Electronic)10.1063/1.3068475https://academica-e.unavarra.es/handle/2454/31877Artificial opal-like structures based on spheres and colloidal particles have been fabricated in a controlled way, presenting optical band-gap properties in the optical frequency range. Nonclose packed artificial opals have also been fabricated and studied recently. In order to gain a better understanding of these phenomena, we have studied macroscopic models of nonclose packed fcc lattices using glass spheres (ε = 7) of 8 mm diameter, and measuring in the microwave region from 10 to 30 GHz. The results have shown a Bragg resonance tunable with filling factor of the opal, and a strong rejected band similar, also present in close packed samples, much less affected by compactness. The relation of this high order band with spheres single layer behavior is also discussed4 p.application/pdfeng© 2009 American Institute of PhysicsOpal-like structuresCompactnessTransmission spectra changesinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess