Abstract
In this work, we demonstrate a metamaterial (MM)-based interlayer coupler. A gradient index (GRIN) MM was employed to achieve refractive index matching, balancing the large difference in the refractive index between Si () and (). In addition, a two-layer interlayer coupler was proposed to further minimize the coupling loss and interlayer crosstalk. Finally, we demonstrated a three-dimensional (3D) interlayer coupler with the insertion loss per layer propagation, with the 40 nm 1-dB-bandwidth (1530–1570 nm) and interlayer crosstalk. These promising results demonstrate the great potential of a GRIN MM-based interlayer coupler in 3D photonic integration.
© 2019 Optical Society of America
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