O. Reshef, Y. Li, M. Yin, L. Christakis, D. Inna Vulis, P. Muñoz, S. Kita, M. Loncar, and E. Mazur. 2016. “Phase-Matching in Dirac-Cone-Based Zero-Index Metamaterials.” In . CLEO: Applications and Technology. Publisher's VersionAbstract
    Using nonlinear scattering theory, we simulate nonlinear signal generation in 2-dimensional zero-index metamaterials based on a photonic Dirac cone at the Γ point. We observe unique phase- matching in multiple simultaneous directions as the index approaches zero.
    D. Inna Vulis, Y. Li, O. Reshef, P. Muñoz, M. Yin, S. Kita, M. Loncar, and E. Mazur. 2016. “CMOS-compatible Zero-Index Metamaterial.” In . CLEO: Science and Innovations. Publisher's VersionAbstract
    We present an on-chip Dirac-cone metamaterial with an impedance- matched zero refractive index at lambda = 1550nm. The design is a square array of air holes in 220-nm silicon- oninsulator (SOI) which offers compatibility with complementary metal-oxide-semiconductor (CMOS) technology.
    Y. Li, S. Kita, P. Muñoz, O. Reshef, D. Inna Vulis, M. Loncar, and E. Mazur. 2015. “Integrated impedance-matched photonic Dirac-cone metamaterials.” In . META Conference. Publisher's VersionAbstract
    We design and fabricate an on-chip Dirac-cone metamaterial with impedance-matched zero index in optical regime. Our metamaterial consists of low-aspect-ratio silicon pillar arrays in an SU-8 matrix clad above and below by gold thin films. This design can serve as an on-chip platform to implement applications of Dirac-cone metamaterials in integrated photonics.
    S. Kita, Y. Li, P. Muñoz, O. Reshef, D. Inna Vulis, R. Day, and C. M. Lieber. 2015. “On-chip Super-robust All-dielectric Zero-Index Material.” In . CLEO. Publisher's VersionAbstract
    The robustness of the modal degeneracy for photonic Dirac-cone can be engineered by designing all-dielectric pillar arrays giving on-chip platform of zero index material for any wavelength regime. We demonstrate this concept for telecom regime.
    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 VersionAbstract
    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.
    D. Inna Vulis, O. Reshef, P. Muñoz, S. Kita, Y. Li, M. Loncar, and E. Mazur. 2015. “Integrated super-couplers based on zero-index metamaterials.” In . META Conference. Publisher's VersionAbstract
    Zero-refractive-index metamaterials have been proposed as potential candidates for super-coupling applications, where light is confined to sub-diffraction limited length scales on-chip. Such a device allows for efficient coupling between disparate modes and compact 90 degree bends, which are challenging to achieve using dielectric waveguides. We discuss the simulation and fabrication results of all-dielectric on- chip zero-index metamaterial-based couplers. We observe transmission normal to all faces, regardless of the structure’s shape, highlighting an unexplored feature of zero index metamaterials for integrated photonics.