A triangular lattice GaAs photonic crystal structure was proposed in a previous work [1] for optical storage in a dynamic
modulation process. This work presents a defect optimization of this tunable coupled resonator array. Preserving
translational invariance and adiabaticity, this structure exhibits an optical analogue to electromagnetic induced
transparency. This triangular lattice structure shows an advantage over the previously proposed square one [2, 3] in
compressing higher bandwidth pulses. The main problem of this structure is the introduction of higher group-velocity
dispersion. In the present work, the structure is redesigned so as to change the operating range of frequency for the
propagating pulse. In this way, the group-velocity dispersion is eliminated to values close to that of the square lattice
structure. The final design, therefore, combines both higher compressible bandwidth and lower group-velocity dispersion
in addition to a fabrication advantage.
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