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arXiv · 2607.00468

Finite-Size Effect Induced Spatial-Spectral Mode Splitting in Membrane Metasurfaces

Chih-Zong Deng·Mu-Hsin Chen·Chun-Hao Chiang·Jui-Han Fu·Vincent Tung·Masanobu Iwanaga·Ya-Lun Ho
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Abstract

This work reports the spatial-spectral engineering and finite-size quantization of optical modes within a triangular-lattice silicon nitride membrane metasurface. Truncating the lattice into a finite square cavity breaks translational symmetry and lifts modal degeneracy, splitting optical modes into discrete cavity-envelope sub-modes. High-resolution photoluminescence (PL) scanning reveals distinct spatial field distributions. The corner-localized sub-mode features the highest Q-factor due to multipolar far-field destructive interference, whereas the core-localized sub-mode exhibits strong radiative coupling. PL mapping reveals a symmetric, four-fold clover-like wavelength arrangement. These results demonstrate that boundary-induced deterministic symmetry can override underlying lattice characteristics, offering a robust strategy for precise spatial-spectral tailoring of light-matter interactions at the nanoscale.

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Chih-Zong Deng, Mu-Hsin Chen, Chun-Hao Chiang, Jui-Han Fu, Vincent Tung, Masanobu Iwanaga, Ya-Lun Ho. 2026-07-01. Finite-Size Effect Induced Spatial-Spectral Mode Splitting in Membrane Metasurfaces. https://arxiv.org/abs/2607.00468

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