Fig. 1. Near-field imaging of a hyperbolic dielectric self-structured phonon polaritons resonant cavity：（a）Near-field imaging of boron nitride nanoribbons at different incident frequencies；（b）Near-field spectral imaging of boron nitride antennas of different lengths，Scale bars：500nm；（c）Circular molybdenum oxide resonant cavity，Scale bars：500nm；（d）Rectangular molybdenum oxide resonant cavity；（e）Polygonal molybdenum oxide resonant cavity，Scale bars：1μm；（f）Various angles of isosceles triangular molybdenum oxide resonant cavity

Fig. 2. Near-field imaging of phonon polarized excitons in doped hyperbolic media：（a）Boron isotope doping；（b）Sodium atomic doping；（c）Sn element doping

Fig. 3. Near-field imaging of hyperbolic polarized excitations with different types of substrates：（a）Near-field imaging of molybdenum oxide on Si/SiO₂ supersurface substrates；（b）Near-field imaging of molybdenum oxide on narrow trench silicon substrates；（c）Near-field imaging of molybdenum oxide on SiO₂ and 4H-SiC substrates，respectively

Fig. 4. Near-field imaging of the in-plane topological transformation of phonon polaritons：（a）Double-layer molybdenum oxide system；（b）Graphene/molybdenum oxide system

Fig. 5. Near-field optical imaging of phonon polaritons in the composite system：（a）Composite structure of graphene/metal disc/molybdenum oxide；（b）Composite structure of boron nitride/molybdenum oxide；（c）Local composite structure of graphene/molybdenum oxide

Fig. 6. Near-field optical imaging of hyperbolic media under metal antenna modulation：（a）Convex-tip metal antenna；（b）Bent metal nanowires；（c）End-arc metal nano-antenna