Colloquium: Yang Li

    Date: 
    Thursday, March 9, 2017 - 3:30pm - 5:00pm
    Location: 
    Meinel 307
    Description: 

    Zero index on a photonic chip: physics and applications

    Abstract(s): 

    Metamaterials with a refractive index of zero exhibit physical properties, including infinite phase velocity and wavelength. Until recently it was not possible 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 on-chip metamaterial platform opens the door to exploring the physics of zero index and its applications in integrated optics.

    Speaker Bio(s): 

    Yang Li received B.S. degree in telecommunication engineering (2006) and M.S. degree in electromagnetic field and microwave technology (2008) from Huazhong University of Science and Technology, China, and Ph.D. degree in Electrical Engineering (2012) from Iowa State University. He is currently a Postdoctoral Fellow in Mazur Group at Harvard University. His research interests include metamaterials and photonic crystals, linear and nonlinear nanophotonics, microwave nondestrucive evaluation, analytical and numerical methods for electromagnetics, antennas and antenna arrays, microwave remote sensing. He received the IEEE Antennas and Propagation Society Doctoral Research Award (2011) and was nominated for R. W. P. King Award (2013).