Liebert, K., Rachoń, M., Bomba, J., Sobczyk, A., Zagrajek, P., Sypek, M., Suszek, J. and Siemion, A. (2018) “THz diffractive focusing structures for broadband application”, Photonics Letters of Poland, 10(3), pp. 76–78. doi: 10.4302/plp.v10i3.845.