Figure 4

Functions \(|{\tilde{{\epsilon }}}^{(1)}|\) (blue lines) and \(|{\tilde{{\epsilon }}}^{(2)}|\) (red lines) for: (a) Tamm plasmon mode at normal incidence (θ = 0, \(\hslash \omega \,=\) 1.2462 eV); (b) edge state (θ = 0, \(\hslash \omega \,=\,\)1.3247 eV); (c) edge state (θ = 0, \(\hslash \omega \,=\) 1.3509 eV); (d) photonic band gap (θ = 0, \(\hslash \omega \,=\,\)1.31 eV). Corresponding points at emission pattern are shown by arrows at Fig. 2a.