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We present theory to describe an engineering dispersion technique to obtain abroadband effective index near zero with an asymmetric planar photonic crystal.The theory provides the manipulating surface plasmon polariton (SPP) to providealternating symmetric stacks of negative and positive effective indices. Theodd alternating effective indices, including positive and negative refraction,arise from transverse resonance that depends on the geometry of the planarphotonic crystal. The purposed technique remains wavepacket in zero phasedispersion since the created parity-time symmetries keep the phase constant inpropagation direction. We use the plane wave expansion method to calculate bandstructure and transmission spectrum then validate with FDTD simulation. Theresults are compared to the recent experimental reports and they will be ofsignificant interest to emerging applications in designing and fabricatingmetamaterials, optical filters, photonic sensors, photonic integrated circuits,near-field optics, and optofluidic biosensing applications.

Surface plasmon polariton waves with zero phase dispersion in a broad spectrum at Near-infrared wavelength