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Emergent collective modes in lattices give birth to many intriguing physicalphenomena in condensed matter physics. Among these collective modes, large-areamodes typically feature small-level spacings, while a mode with stablefrequency tends to be spatially tightly confined. Here, we theoreticallypropose and experimentally demonstrate a spectral-isolated photonic topologicalcorner mode with a tunable mode area and stable frequency in a two-dimensionalphotonic crystal. This mode emerges from hybridizing the large-area homogeneousmode and in-gap topological corner modes. Remarkably, this large-areahomogeneous mode possesses unique chirality and has a tunable mode area underthe change of the mass term of the inner topological non-trivial lattice. Weexperimentally observe such topological large-area corner modes(TLCM) in a 2Dphotonic system and demonstrate the robustness by introducing disorders in thestructure. Our findings have propelled the forefront of higher-order topologyresearch, transitioning it from single-lattice systems to multi-latticesystems. They may support promising potential applications, particularly invertical-cavity surface-emitting lasers.

Spectral-isolated photonic topological corner mode with a tunable mode area and stable frequency