Gersen, H.H.GersenEngelen, R.J.P.R.J.P.EngelenKorterik, J.P.J.P.KorterikKuipers, L.L.Kuipersvan Hulst, N.F.N.F.van HulstBogaerts, WimWimBogaertsKrauss, T.F.T.F.Krauss2021-10-162021-10-162005https://imec-publications.be/handle/20.500.12860/10498Direct observation of bloch harmonics and negative phase velocity in photonic crystal waveguidesJournal article