Dynamically tunable robust ultrahigh-Q merging bound states in the continuum in phase-change materials metasurface
Bound states in the continuum (BICs) are localized states within the radiative continuum that exhibit high quality-factor (Q-factor) resonance, which significantly boosts light–matter interactions. However, out-of-plane radiation losses can arise from inherent material absorption and inevitable tech...
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De Gruyter
2025-01-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2024-0557 |
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| author | Ren Hui Liu Jietao Jiang Zengxuan Zhuang Lingyun Jiang Botao Xu Chunhao Cheng Bo Song Guofeng |
| author_facet | Ren Hui Liu Jietao Jiang Zengxuan Zhuang Lingyun Jiang Botao Xu Chunhao Cheng Bo Song Guofeng |
| author_sort | Ren Hui |
| collection | DOAJ |
| description | Bound states in the continuum (BICs) are localized states within the radiative continuum that exhibit high quality-factor (Q-factor) resonance, which significantly boosts light–matter interactions. However, out-of-plane radiation losses can arise from inherent material absorption and inevitable technological imperfections during fabrication process. Merging BICs have been introduced as a solution to address the issue of out-of-plane radiation losses. By merging BICs, it is possible to expand the area of high Q-factor resonance in momentum space, thereby enhancing the system’s robustness against external perturbations. However, achieving this enhancement is contingent upon altering the geometrical parameters of the structure, which inherently restricts its dynamic tunability. Here, we propose an emerging approach that integrates phase change materials (PCMs) into photonic crystal slabs (PCs) metasurface, enabling dynamically tuning of merged BICs. By utilizing low-loss Sb2S3 as a tunable PCMs, we demonstrate that altering its phase state can merge BICs, leading to a substantial increase in the high Q-factor across an extended range of wave vectors space. Furthermore, this study validates the universality and robustness of merging BICs against common unit-cell topology fabrication defects. Additionally, by twisting the square holes to break in-plane symmetry, asymmetric merging and inversion of topological charge at the Γ-point are achieved. This approach leverages phase-transition states of PCMs to enable reconfigurable polarization distribution of radiation field without scale and parameter changes, which is tunable and offers promising potential applications in optical vortices and nano-lasers. |
| format | Article |
| id | doaj-art-1b93aaad1b114e26ae0abc87a33daae3 |
| institution | DOAJ |
| issn | 2192-8614 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | De Gruyter |
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| series | Nanophotonics |
| spelling | doaj-art-1b93aaad1b114e26ae0abc87a33daae32025-08-20T03:10:49ZengDe GruyterNanophotonics2192-86142025-01-0114334335110.1515/nanoph-2024-0557Dynamically tunable robust ultrahigh-Q merging bound states in the continuum in phase-change materials metasurfaceRen Hui0Liu Jietao1Jiang Zengxuan2Zhuang Lingyun3Jiang Botao4Xu Chunhao5Cheng Bo6Song Guofeng7Nano Optoelectronics Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, ChinaInstitute of Intelligent Photonics, 12538Nankai University, Tianjin, ChinaNano Optoelectronics Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, ChinaNano Optoelectronics Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, ChinaNano Optoelectronics Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, ChinaNano Optoelectronics Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, ChinaNano Optoelectronics Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, ChinaNano Optoelectronics Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, ChinaBound states in the continuum (BICs) are localized states within the radiative continuum that exhibit high quality-factor (Q-factor) resonance, which significantly boosts light–matter interactions. However, out-of-plane radiation losses can arise from inherent material absorption and inevitable technological imperfections during fabrication process. Merging BICs have been introduced as a solution to address the issue of out-of-plane radiation losses. By merging BICs, it is possible to expand the area of high Q-factor resonance in momentum space, thereby enhancing the system’s robustness against external perturbations. However, achieving this enhancement is contingent upon altering the geometrical parameters of the structure, which inherently restricts its dynamic tunability. Here, we propose an emerging approach that integrates phase change materials (PCMs) into photonic crystal slabs (PCs) metasurface, enabling dynamically tuning of merged BICs. By utilizing low-loss Sb2S3 as a tunable PCMs, we demonstrate that altering its phase state can merge BICs, leading to a substantial increase in the high Q-factor across an extended range of wave vectors space. Furthermore, this study validates the universality and robustness of merging BICs against common unit-cell topology fabrication defects. Additionally, by twisting the square holes to break in-plane symmetry, asymmetric merging and inversion of topological charge at the Γ-point are achieved. This approach leverages phase-transition states of PCMs to enable reconfigurable polarization distribution of radiation field without scale and parameter changes, which is tunable and offers promising potential applications in optical vortices and nano-lasers.https://doi.org/10.1515/nanoph-2024-0557merging bicsphase change materialstunability |
| spellingShingle | Ren Hui Liu Jietao Jiang Zengxuan Zhuang Lingyun Jiang Botao Xu Chunhao Cheng Bo Song Guofeng Dynamically tunable robust ultrahigh-Q merging bound states in the continuum in phase-change materials metasurface Nanophotonics merging bics phase change materials tunability |
| title | Dynamically tunable robust ultrahigh-Q merging bound states in the continuum in phase-change materials metasurface |
| title_full | Dynamically tunable robust ultrahigh-Q merging bound states in the continuum in phase-change materials metasurface |
| title_fullStr | Dynamically tunable robust ultrahigh-Q merging bound states in the continuum in phase-change materials metasurface |
| title_full_unstemmed | Dynamically tunable robust ultrahigh-Q merging bound states in the continuum in phase-change materials metasurface |
| title_short | Dynamically tunable robust ultrahigh-Q merging bound states in the continuum in phase-change materials metasurface |
| title_sort | dynamically tunable robust ultrahigh q merging bound states in the continuum in phase change materials metasurface |
| topic | merging bics phase change materials tunability |
| url | https://doi.org/10.1515/nanoph-2024-0557 |
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