A scale-invariant large-area single-mode topological photonic cavity
arxiv(2024)
摘要
Emergent collective modes in lattices give birth to many intriguing physical
phenomena in condensed matter physics. Among these collective modes, large-area
modes typically feature small level spacings, whilst a single mode tends to be
spatially tightly confined. Here, we theoretically propose and experimentally
demonstrate a unique scale-invariant, large-area, and single-mode topological
cavity mode in a two-dimensional photonic crystal. This mode emerges from the
hybridization of the large-area fundamental Dirac mode and in-gap topological
corner modes. Remarkably, we find that the scale-invariant, large-area, and
single-mode topological cavity mode possesses unique chiralities and with a
tunable mode area under the change of the mass term of the inner topological
nontrivial lattice. We experimentally observe such topological cavity modes in
a 2D photonic system and demonstrate the robustness by introducing disorders in
the cavity structure. Our findings have propelled the forefront of higher-order
topology research, transitioning it from single-lattice systems to
multi-lattice systems and may support promising potential applications,
particularly in vertical-cavity surface-emitting lasers.
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