Dispersion Control in Two-Dimensional Superlattice Photonic Crystal Slab Waveguides by Atomic Layer Deposition
The frequency and dispersion of photonic bands in two-dimensional triangular-based superlattice photonic crystal Si slab waveguides were manipulated using atomic layer deposition. The samples were conformally coated with increasing thicknesses of TiO2 and characterized by polarized angular-dependent reflectance measurements, which revealed shifts in the photonic band frequencies of 16% as well as continuous changes in band dispersion. The ability to tune toward zero group velocity by tuning band repulsion between same-polarization bands is demonstrated. Finite-difference time-domain calculations, combined with a dielectric weighting model, were used to assess the observed band and dispersion tuning.
Gaillot, D. P.; Graugnard, Elton; Blair, J.; and Summers, C. J.. (2007). "Dispersion Control in Two-Dimensional Superlattice Photonic Crystal Slab Waveguides by Atomic Layer Deposition". Applied Physics Letters, 91(18), 181123-1 - 181123-3.