Slow-Light Effect in Dual-Periodic Photonic Lattice
We present analytical and numerical studies of a photonic lattice with short- and long-range harmonic modulations of the refractive index. Such structures can be prepared experimentally with holographic photolithography. In the spectral region of the photonic bandgap of the underlying single-periodic crystal, we observe a series of bands with anomalously small dispersion. The related slow-light effect is attributed to the long-range modulation of the photonic lattice that leads to formation of an array of evanescently coupled high-Q cavities. The band structure of the lattice is studied with several techniques: (i) transfer matrix approach; (ii) an analysis of resonant coupling in the process of band folding; (iii) effective-medium approach based on coupled-mode theory; and (iv) the Bogolyubov-Mitropolsky approach. The latter method, commonly used in the studies of nonlinear oscillators, was employed to investigate the behavior of eigenfunction envelopes and the band structure of the dual-periodic photonic lattice. We show that reliable results can be obtained even in the case of large refractive index modulation.
A. Yamilov et al., "Slow-Light Effect in Dual-Periodic Photonic Lattice," Journal of the Optical Society of America B: Optical Physics, Optical Society of America, Apr 2008.
The definitive version is available at http://dx.doi.org/10.1364/JOSAB.25.000599
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Keywords and Phrases
Effective Medium Approach; Light Refraction; Periodic Structures; Photonic Band Gaps; Photonic Lattices; Photonics
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