Abstract
Coherently coupled optical microresonators are studied as a concept for guiding and slowing down light. So-called coupled-resonator optical waveguides (CROWs) composed of nanocrystal doped microspheres are studied using mode mapping spectroscopy at the diffraction limit and microphotoluminescence spectroscopy. We demonstate coherent photon coupling in one-dimensional multiresonator chains and show the evolution of individual cavity modes into waveguide modes. A coupled-oscillator model is developed, which explains the resulting coupled-resonator mode patterns in finite systems. The potential to slow down the group velocity of light by orders of magnitude is explored. Experimentally, a slowing-factor S = 31 has been observed. A model for disorder in CROW structures is developed, by which size tuning of individual resonators is found to result in anticrossing relations. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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