Special Presentation: Yang Li

    Tuesday, March 20, 2018 - 3:00pm
    Franken Conference Room (Meinel 821)

    When Superradiance Meets Zero Index


    Superradiance is a many-body quantum optical phenomenon in which atoms radiate coherently with one another, and the effect of constructive interference leads to an N-fold increase in the spontaneous emission rate, where N is the number of atoms. Metamaterials with a refractive index of zero exhibit infinite spatial wavelength and perfect spatial coherence, enabling enhanced superradiance over large extended regions in space. Until recently it was not possible to implement such a material on a photonic chip. We designed and fabricated an on-chip integrated metamaterial with a refractive index of zero in the optical regime. We demonstrated that the index of refraction is zero, by observing the refraction of light though a prism made of this metamaterial and by directly observing the (infinite) spatial wavelength in a zero-index waveguide. The zero-index metamaterial can be fabricated using standard planar processes over a large area and in any shape, and can be impedance matched to other optical components, opening the door to exploring applications of strongly extended superradiance in scalable quantum information processing.

    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 at Harvard University. His current research interests include metamaterials and photonic crystals, linear and nonlinear nanophotonics, and quantum photonics. He received the IEEE Antennas and Propagation Society Doctoral Research Award and was nominated for the R.W.P. King Award.