Fig. 4: Spatial field distribution and dispersion of hBN equivalent geometry and Q-factor spectrum of the 2D polaritonic nanoresonators.
Cross-sectional view of the spatial x − component of the electric field as a function of the wavelength for (a) 3rd and (b) 5th mode of the hybridized polariton. The graphene doping is 0.4 eV. The vertical black scale bar corresponds to 10 nm for panels (a–d). c and d correspond to the first and second order mode, respectively, of the bottom hBN (6 nm thick) of the equivalent system (E.S.) geometry consisting of the bottom hBN embedded by two gold layers of 10 nm without the presence of graphene and the top hBN as shown in the illustrations on the top part of the figure. e Dispersion relation of the investigated modes of the two systems. f Q-factor spectrum of the measured 2D polaritonic nanoresonators. The regions highlighted in green correspond to the RBs of hBN.
