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(Color online) (a) Dispersion relations and (b), (c) transmission spectra of periodic 1D MDPC presented in the inset of (a). In (a)–(c), calculations with parameters of = 80 nm, , and with are illustrated by red dotted curves, while = 0 is considered, the results are demonstrated by gray solid curves; A and A′ are the cutoff wavelengths of dielectric-/metal-like states for = 10 nm and 30 nm, respectively.
(Color online) (a) Schematic of chirped 1D MDPC structure for rainbow trapping, which consists of 21 Si3N4 slabs alternating with Ag slabs. In the structure, linearly increases from = 10 nm to = 30 nm by incremental step of 1 nm. (b) Dependence of on incident wavelength severally obtained from FDTD (red solid curve) and Eq. (2) (blue solid curve). Inset of (b), simulated intensity distributions () as incident light is (i) 620 nm, (ii) 650 nm, and (iii) 700 nm, respectively.
(Color online) (a) Simulated intensity distributions in time-position plane along the z axis. Where the incident light is polarized (the magnetic field is parallel to the slabs) Gaussian pulse centered at 620 nm with width of 70 fs. (b) The arrival time and (c) the group velocity of pulse packet peak as functions of propagation distance.
(Color online) Relation of the minimum and corresponding thickness to the center wavelength of 70 fs width Gaussian pulse.
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