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(Color online) Light intensity distribution around the miniband regions (a) in a 1D CROW structure with identical internal and external Bragg mirrors (sample S1) and (b) in a thinner sample with optimized external mirrors (S2). (c) and (d) show the cross-sectional SEM micrographs of samples S1 and S2. The electric field distribution inside the photonic structures at the central frequencies of the minibands is also plotted, showing an enhancement and significant penetration inside the mirrors for sample S2.
(Color online) Static transmission spectra and the measured phase obtained through white-light interferometry method: (a) four (sample S2) and (b) five (sample S3) coupled cavity structures with optimized external mirrors. Numerically calculated phase is plotted as a solid line in both graphs for comparison. The inset shows the transmission and the phase around the miniband region of sample (S1) with nonoptimized external mirrors.
(Color online) Measured (scatter) and calculated (solid lines) time-resolved ultrashort pulse propagation through sample S2. The reference Gaussian pulse is transmitted with negligible distortion when it fits the wide transmission miniband. Long exponential decays or oscillatory behavior is observed when the input pulse excites the edge states or two maxima of the miniband.
(Color online) The group velocity obtained from phase (open circles) and from time-resolved measurements (full triangles). (a) Four cavity (S2) and (b) five cavity sample (S3) cases. Transfer matrix calculations are plotted in both graphs as solid lines. A group velocity reduction by a factor of 5 is observed in both samples. The group velocity has been extracted within a 4% error in the case of time-resolved data.
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