Open AccessDispersion Engineering with Leaky-Mode Resonant Photonic Lattices
Author(s) -
Robert Magnusson,
Mehrdad ShokoohSaremi,
Xin Wang
Publication year - 2009
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.000108
Subject(s) - leaky mode , slow light , optics , bandwidth (computing) , materials science , dispersion (optics) , guided mode resonance , resonance (particle physics) , polarization mode dispersion , silicon on insulator , group delay and phase delay , coupled mode theory , optoelectronics , wavelength , physics , refractive index , single mode optical fiber , silicon , photonic crystal , telecommunications , optical fiber , radiation mode , diffraction grating , computer science , particle physics
We investigate the dispersion properties of leaky-mode resonance elements with emphasis on slow-light applications. Using particle swarm optimization, we design three exemplary bandpass leaky-mode devices. A single-layer silicon-on-insulator leaky-mode element shows a time-delay peak of ~8 ps at the resonance wavelength. A double membrane element exhibits an average delay of ~6 ps over ~0.75 nm spectral bandwidth with a relatively flat dispersion response. By cascading five double-membrane elements, we achieve an accumulative delay of ~30 ps with a very flat dispersion response over ~0.5 nm bandwidth. Thus, we show that delay elements based on leaky-mode resonance, by proper design, exhibit large amount of delay yet very flat dispersion over appreciable spectral bandwidths, making them potential candidates for optical buffers, delay lines, and switches.