Complete band gaps in three-dimensional quantum dot photonic crystals
2006 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 74, no 11, 115325- p.Article in journal (Refereed) Published
Nonlocal investigations have been performed about exciton-photon couplings in three-dimensional quantum-dot (QD) photonic crystals and a complete photonic band gap has been found in the band structure of a diamond lattice. The width of such a band gap can be broadened by increasing the filling ratio of the QDs (increasing the QD radius or/and decreasing the lattice constant of the photonic crystal). By decomposing the diamond lattice into two interlacing face-centered-cubic (fcc) sublattices, we have found that by significantly modifying the QD radius in one fcc sublattice (the diamond lattice therefore changed to the zinc blende lattice), the band structure of the zinc blende lattice is in principle the sum of two individual fcc sublattices. However, a huge exciton-photon coupling is observed near the band gaps of the two individual fcc sublattices when the radii of the QDs in the two fcc sublattices approach each other, resulting in the complete band gaps of the diamond structure.
Place, publisher, year, edition, pages
2006. Vol. 74, no 11, 115325- p.
IdentifiersURN: urn:nbn:se:kth:diva-16017DOI: 10.1103/PhysRevB.74.115325ISI: 000240872300089ScopusID: 2-s2.0-33748996518OAI: oai:DiVA.org:kth-16017DiVA: diva2:334059
QC 201008252010-08-052010-08-052010-08-25Bibliographically approved