Prof. Dr. Kurt Busch forscht auf dem Gebiet der theoretischen Nanophotonik und Quantenoptik. Sein Schwerpunkt liegt in der mathematischen Modellierung und numerischen Simulation der Licht-Materie-Wechselwirkung in Nanostrukturen, insbesondere plasmonischen Systemen und Metamaterialien. Er entwickelt fortschrittliche Materialmodelle, um nichtlokale Effekte und ultraschnelle elektronische Dynamik zu beschreiben. Seine Arbeit verbindet theoretische Physik mit Anwendungen in der Quantentechnologie, Sensortechnik und integrierten Photonik.
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Prof. Dr. rer. nat. Kurt Busch
HU-FIS-Profil ↗QuEST: Europäisches Doktorandennetzwerk für Quantenelektrodynamik mit Silizium-Nanotechnologie
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QuEST: Europäisches Doktorandennetzwerk für Quantenelektrodynamik mit Silizium-Nanotechnologie
university
SFB 951/3: Theorie der elktro-optischen und chiralen Kopplung in plasmonisch-verstärkten HIOS (TP B10)
university
DFG-Sachbeihilfe: SiGeSn-Nanostrukturen für integrierte Quantentopf-Infrarot-Photodetektoren
university
Förderer: DFG Sachbeihilfe Zeitraum: 08/2012 - 12/2015 Projektleitung: Prof. Dr. rer. nat. Kurt Busch
Förderer: DFG Sonderforschungsbereich Zeitraum: 01/2013 - 06/2015 Projektleitung: Prof. Dr. rer. nat. Kurt Busch
Förderer: DFG Schwerpunktprogramm Zeitraum: 02/2013 - 07/2016 Projektleitung: Prof. Dr. rer. nat. Kurt Busch
Nature Materials · DOI
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics · DOI
We present a detailed study of photonic band structure in certain self-organizing systems that self-assemble into large-scale photonic crystals with photonic band gaps (PBGs) or pseudogaps in the near-visible frequency regime. These include colloidal suspensions, inverted opals, and macroporous silicon. We show that complete three-dimensional PBGs spanning roughly 10% and 15% of the gap center frequency are attainable by incomplete infiltration of an opal with silicon and germanium, respectively. The photonic band structure of both face center cubic and hexagonal close packed photonic crystals are evaluated. We delineate how the PBG is modified by sintering the opal prior to infiltration and by applying strain along various crystallographic directions. We evaluate the total photon density of states as well as the local density of states (LDOS) projected onto various points within the photonic crystal. It is shown that the LDOS may exhibit considerable pseudogap structure even for systems that do not exhibit a complete PBG. These results are directly relevant to quantum optical experiments in which atoms, dye molecules, or other active materials are inserted into specific locations within the photonic crystal. When the resonant optical transition of these dopants is tuned close to a pseudogap or other abrupt structure in the LDOS, novel effects in radiative dynamics associated with a ``colored vacuum'' may be realized.
Physical Review Letters · DOI
We demonstrate that when an optically birefringent nematic liquid crystal is infiltrated into the void regions of an inverse opal, photonic-band-gap (PBG) material, the resulting composite material exhibits a completely tunable PBG. In particular, the three-dimensional PBG can be completely opened or closed by applying an electric field which rotates the axis of the nematic molecules relative to the inverse opal backbone. Tunable light localization effects may be realized by controlling the orientational disorder in the nematic.