D. T. Schoen, Atre, A. C., ía-Etxarri, A., Dionne, J. A., and Brongersma, M. L.,
“Probing Complex Reflection Coefficients in One-Dimensional Surface Plasmon Polariton Waveguides and Cavities Using STEM EELS”,
Nano Letters, vol. 15, no. 1, pp. 120 - 126, 2015.