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arXiv · 2607.23281

Three-dimensional confinement of light in photonic crystals without bandgaps

Manxi Shi·Sachin Vaidya·Ali Ghorashi·Steven G. Johnson·Marin Soljačić
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Abstract

We demonstrate that confinement of light in three dimensions is possible in photonic crystals without a complete photonic bandgap. Our approach exploits symmetry-protected quadratic degeneracies in the bulk band structure, where the photonic density of states vanishes at an isolated frequency. By introducing a point defect, we create a localized mode whose symmetry representation is incompatible with that of the surrounding bulk modes, suppressing coupling to propagating channels. The combination of vanishing density of states and a symmetry mismatch yields bound defect modes despite the absence of a spectral gap, as confirmed by time- and frequency-domain numerical simulations. This approach highlights the role of engineering the photonic environment around the defect to enable confinement, potentially providing a new route for designing optical cavities in three-dimensional photonic crystals.

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Manxi Shi, Sachin Vaidya, Ali Ghorashi, Steven G. Johnson, Marin Soljačić. 2026-07-25. Three-dimensional confinement of light in photonic crystals without bandgaps. https://arxiv.org/abs/2607.23281

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