Coupled resonator optical waveguide structures with highly dispersive media
2007 (English)In: Optics Express, ISSN 1094-4087, Vol. 15, no 16, 10362-10369 p.Article in journal (Refereed) Published
Analysis of photonic crystal coupled resonator optical waveguide (CROW) structures with a highly dispersive background medium is presented. A finite-difference time-domain algorithm was employed which contains an exact representation of the permittivity of a three-level atomic system which exhibits electromagnetically induced transparency (EIT). We find that the coupling strength between nearest-neighbor cavities in the CROW decreases with increasing steepness of the background dispersion, which is continuously tunable as it is directly related to the control field Rabi frequency. The weaker coupling decreases the speed of pulse propagation through the waveguide. In addition, due to the dispersive nature of the EIT background, the CROW band shape is tuned around a fixed k-point. Thus, the EIT background enables dynamic tunability of the CROW band shape and the group velocity in the structure at a fixed operating point in momentum space.
Place, publisher, year, edition, pages
2007. Vol. 15, no 16, 10362-10369 p.
electromagnetically induced transparency, time-domain method, fdtd
IdentifiersURN: urn:nbn:se:kth:diva-16875ISI: 000248753100049ScopusID: 2-s2.0-34547747370OAI: oai:DiVA.org:kth-16875DiVA: diva2:334918
QC 201005252010-08-052010-08-05Bibliographically approved