Determine experimentally accessible modal enhancement in finite CdO-cylinder slabs

Quantify the experimentally accessible enhancement of time-reflected power for a finite slab of CdO cylinders by accounting for finite-pulse excitation, interface transmission, spectral and angular overlap, boundary effects on the temporal eigenmodes, and the excitation and outcoupling design required to collect the full modal enhancement.

Background

The paper predicts a large enhancement of the summed powers of two time-reflected modes in a spatially structured CdO-cylinder array relative to homogeneous CdO under the same constituent plasma-frequency modulation. However, the two reflected modes can have nearly opposite phases and close frequencies near the enhancement maximum, causing substantial cancellation when their pulses overlap. Although different group velocities may eventually separate the pulses, absorption in the CdO metamaterial can attenuate them before they become experimentally distinguishable.

The paper therefore identifies an unresolved experimental-design problem: determining the enhancement that can actually be measured in a finite array slab. This requires modeling the complete finite-pulse interaction, including transmission through the spatial interface, spectral and angular mode overlap, boundary-induced effects, and the excitation and outcoupling configuration needed to collect the full modal enhancement.