On-chip zero-index metamaterials


Y. Li, S. Kita, P. Muñoz, O. Reshef, D. Inna Vulis, M. Yin, M. Loncar, and E. Mazur. 2015. “On-chip zero-index metamaterials.” Nat. Photonics, 9, Pp. 738–742. Publisher's Version


Metamaterials with a refractive index of zero exhibit physical properties such as infinite phase velocity and wavelength. However, there is no way to implement these materials on a photonic chip, restricting the investigation and application of zero-index phenomena to simple shapes and small scales. We designed and fabricated an on-chip integrated metamaterial with a refractive index of zero in the optical regime. Light refracts perpendicular to the facets of a prism made of this metamaterial, directly demonstrating that the index of refraction is zero. The metamaterial consists of low-aspect- ratio silicon pillar arrays embedded in a polymer matrix and clad by gold films. This structure can be fabricated using standard planar processes over a large area in arbitrary shapes and can efficiently couple to photonic integrated circuits and other optical elements. This novel on- chip metamaterial platform opens the door to exploring the physics of zero index and its applications in integrated optics.
Last updated on 07/24/2019