H. R.  Seren, Zhang, J., Keiser, G. R., Maddox, S. J., Zhao, X., Fan, K., Bank, S. R., Zhang, X., and Averitt, R. D., ?Nonlinear terahertz devices utilizing semiconducting plasmonic metamaterials?, Light: Science & Applications, vol. 5, no. 5, p. e16078, 2016.