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Topological phases based on tight-binding models have been extensivelystudied in recent decades. By mimicking the linear combination of atomicorbitals in tight-binding models based on the evanescent couplings betweenresonators in classical waves, numerous experimental demonstrations oftopological phases have been successfully conducted. However, in dielectricphotonic crystals, the Mie resonances' states decay too slowly as $1/r$ when$r$ $\to$ $\infty$, leading to intrinsically different physical propertiesbetween tight-binding models and dielectric photonic crystals. Here, we proposea confined Mie resonance photonic crystal by embedding perfect electricconductors in between dielectric rods, leading to a perfectly matched bandstructure as the tight-binding models with nearest-neighbour couplings. As aconsequence, disentangled band structure spanned by higher atomic orbitals isobserved. Moreover, we also achieve a three-dimensional photonic crystal with acomplete photonic bandgap and third-order topology based on our design. Ourimplementation provides a versatile platform for studying exotic higher-orbitalbands and achieving tight-binding-like 3D topological photonic crystals.

Disentangled higher-orbital bands and chiral symmetric topology in confined Mie resonance photonic crystals