Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics
M. Hammer, L. Ebers, J. Förstner, OSA Continuum 4 (2021) 3081.

Coupled microstrip-cavities under oblique incidence of semi-guided waves: a lossless integrated optical add-drop filter
L. Ebers, M. Hammer, M.B. Berkemeier, A. Menzel, J. Förstner, OSA Continuum 2 (2019) 3288.