Abstract

To obtain all-angle polarization-insensitive negative refraction, a 2D square array photonic crystal has been systematically investigated here. The presented structure is composed of air holes in a high-dielectric ($\epsilon =36$) background and provides all-angle polarization-insensitive negative refraction in the first band along the $\mathrm{\Gamma }M$ direction, in a bandwidth of $\mathrm{\Delta }\omega /{\omega }_c=2.4\%$. The structure is applicable in polarization beam splitters used in integrated space-division multiplexing and has potential applications in highly efficient negative refraction-based phenomena, such as in angle and polarization-independent cloaking and invisibility. The results achieved by the finite difference time domain and the plane wave expansion methods here are in good agreement.

© 2019 Optical Society of America

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