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Complete band gaps in three-dimensional quantum dot photonic crystals
KTH, Skolan för bioteknologi (BIO), Teoretisk kemi.
KTH, Skolan för bioteknologi (BIO), Teoretisk kemi.ORCID-id: 0000-0002-2442-1809
National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Science.
National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Science.
Visa övriga samt affilieringar
2006 (Engelska)Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 74, nr 11, s. 115325-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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.

Ort, förlag, år, upplaga, sidor
2006. Vol. 74, nr 11, s. 115325-
Nyckelord [en]
lattices, polaritons
Nationell ämneskategori
Teoretisk kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-16017DOI: 10.1103/PhysRevB.74.115325ISI: 000240872300089Scopus ID: 2-s2.0-33748996518OAI: oai:DiVA.org:kth-16017DiVA, id: diva2:334059
Anmärkning
QC 20100825Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
1. Optical properties of active photonic materials
Öppna denna publikation i ny flik eller fönster >>Optical properties of active photonic materials
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Because of the generation of polaritons, which are quasiparticles possessing the characteristics of both photonics and electronics, active photonic materials offer a possible solution to transfer electromagnetic energy below the diffraction limit and further increase the density of photonic integrated circuits. A theoretical investigation of these exciting materials is, therefore, very important for practical applications.

Four different kinds of polaritons have been studied in this thesis, (1) surface polaritons of negative-index-material cylindric rods, (2) exciton polaritons of semiconductor quantum dots, (3) localized plasmon polaritons of metallic nanoshells, and (4) surface plasmon polaritons of subwavelength hole arrays in thin metal films. All these types of polaritons were found to strongly affect the optical properties of the studied active photonic materials. More specifically, (1) for two-dimensional photonic crystals composed of negative-index-material cylindric rods, the coupling among surface polaritons localized in the rods results in dispersionless anti-crossing bands; (2) for three-dimensional diamond-lattice quantum-dot photonic crystals, the exciton polariton resonances lead to the formation of complete band gaps in the dispersion relationships; (3) for metallic nanoshells, the thickness of the metal shell strongly modifies the localized plasmon polaritons, and therefore influences the degree of localization of the electromagnetic field inside the metallic nanoshells; (4) for subwavelength hole arrays in thin metal films, high-order surface-polariton Bloch waves contribute significantly to the efficient transmission.

To numerically simulate these active photonic materials, we introduced three approaches, (1) an extended plane-wave-based transfer-matrix approach for negative- index-material media, (2) a plane-wave method for semiconductor quantum-dot photonic crystals, and (3) an auxiliary-differential-equation finite-difference time- domain approach for semiconductor quantum-dot arrays. A brief perspective is also given at the end of this thesis.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2007. s. 78
Nyckelord
nanophotonics, plasmonics
Nationell ämneskategori
Teoretisk kemi
Identifikatorer
urn:nbn:se:kth:diva-4497 (URN)978-91-7178-763-7 (ISBN)
Disputation
2007-10-15, FA32, Main Building, AlbaNova, AlbaNova, 14:00
Opponent
Handledare
Anmärkning
QC 20100825Tillgänglig från: 2007-09-25 Skapad: 2007-09-25 Senast uppdaterad: 2010-08-25Bibliografiskt granskad

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Fu, YingÅgren, Hans

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