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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.20272 |
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| _version_ | 1866910003230670848 |
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| author | Kim, Donghwee Shin, Chiwon Kim, Changi Lee, Gil-Woo No, You-Shin Yang, Jin-Kyu Jeon, Heonsu Park, Hong-Gyu |
| author_facet | Kim, Donghwee Shin, Chiwon Kim, Changi Lee, Gil-Woo No, You-Shin Yang, Jin-Kyu Jeon, Heonsu Park, Hong-Gyu |
| contents | Inter-cell and/or interlayer coupling in Moire superlattices can generate flatbands and collective eigenmodes that enable emergent physical phenomena, motivating extensive exploration of Moire-inspired photonic devices. However, the experimental validation of robust inter-cell interactions in Moire photonic structures and the modulation of flatbands for specific photonic applications remain challenging. Here, we propose a lattice-mismatch Moire cavity and demonstrate nanolasers enabled by strong flatband coupling. In contrast to a twist-angle Moire cavity, a lattice-mismatch Moire cavity provides a stable flatband frequency and a substantial enhancement in Q factor compared to an isolated single-cell cavity, as the unit-cell size decreases. The photonic band-structure measurement of the small-unit-cell Moire cavity by photoluminescence reveals pronounced flatbands. Cell-resolved spectroscopy further confirms the presence of flatbands by identifying resonant peaks that consistently emerge across unit cells in a Moire cavity with a lattice mismatch of 102 nm, but not in a larger-unit-cell Moire cavity with a mismatch of 60 nm. Furthermore, mode selection is achieved by reducing the center-hole size, thus isolating the hexapole mode from the degenerate dipole modes while maintaining strong inter-cell coupling. Consequently, we demonstrate a low-threshold hexapole flatband laser in a single mode. Therefore, the systematic modification of the relative lattice parameters of the two constituent lattices offers a promising strategy for developing Moire nanolasers and flatband nanophotonic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_20272 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Lattice-mismatch Moire laser with strong flatband coupling Kim, Donghwee Shin, Chiwon Kim, Changi Lee, Gil-Woo No, You-Shin Yang, Jin-Kyu Jeon, Heonsu Park, Hong-Gyu Optics Inter-cell and/or interlayer coupling in Moire superlattices can generate flatbands and collective eigenmodes that enable emergent physical phenomena, motivating extensive exploration of Moire-inspired photonic devices. However, the experimental validation of robust inter-cell interactions in Moire photonic structures and the modulation of flatbands for specific photonic applications remain challenging. Here, we propose a lattice-mismatch Moire cavity and demonstrate nanolasers enabled by strong flatband coupling. In contrast to a twist-angle Moire cavity, a lattice-mismatch Moire cavity provides a stable flatband frequency and a substantial enhancement in Q factor compared to an isolated single-cell cavity, as the unit-cell size decreases. The photonic band-structure measurement of the small-unit-cell Moire cavity by photoluminescence reveals pronounced flatbands. Cell-resolved spectroscopy further confirms the presence of flatbands by identifying resonant peaks that consistently emerge across unit cells in a Moire cavity with a lattice mismatch of 102 nm, but not in a larger-unit-cell Moire cavity with a mismatch of 60 nm. Furthermore, mode selection is achieved by reducing the center-hole size, thus isolating the hexapole mode from the degenerate dipole modes while maintaining strong inter-cell coupling. Consequently, we demonstrate a low-threshold hexapole flatband laser in a single mode. Therefore, the systematic modification of the relative lattice parameters of the two constituent lattices offers a promising strategy for developing Moire nanolasers and flatband nanophotonic devices. |
| title | Lattice-mismatch Moire laser with strong flatband coupling |
| topic | Optics |
| url | https://arxiv.org/abs/2601.20272 |