Experimental observation of slow mode dispersion in photonic crystal coupled-cavity waveguides.
We experimentally investigate the dispersion curve of an integrated silicon-on-insulator coupled-cavity waveguide in a photonic crystal environment using a technique based on far-field imaging. We show that a chain of eight coupled cavities of a moderate Q factor can form a continuous dispersion band characterized by extremely flat dispersion and a group index of 105+/-20 within a 2.6 nm wavelength range. The experimental results are well reproduced by theoretical calculations based on the guided-mode expansion method.
Jágerská
Jana
J
Institut de Photonique et dElectronique Quantiques, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland. jana.jagerska@epfl.ch
Le Thomas
Nicolas
N
Zabelin
Vasily
V
Houdré
Romuald
R
Bogaerts
Wim
W
Dumon
Pieter
P
Baets
Roel
R