Fig. 5. Loss mechanism for hyperbolic image polaritons in h¹⁰BN.

a Schematic illustration for the surface scatterings mediated by the hyperbolic rays inside hBN. b The loss contributions from three different damping mechanisms calculated using the analytical model in Eq. (1) for g = 3 nm. The red circles are the total scattering rates measured from the samples with different periodicities. The experimental (symbols) and analytical results (solid lines) for the quality factors obtained from the resonances for c the symmetric mode and d antisymmetric mode.