Download all files (2.45MB)

コレクション

引用

説明:

A symmetry-protected bound state in the continuum (BIC) is one of the bases for high-resolution photonic refractometric sensors that rely on spectral shifts. However, a trade-off exists between the quality (Q) factors and the resonance amplitudes when the asymmetries of the unit cell are changed, making it difficult to intuitively determine the optimal nanostructural geometry. In this study, we present a theoretical and experimental approach for identifying the asymmetry parameters of dielectric metasurfaces that yield the lowest limit of detection (LOD). Silicon-based metasurfaces with asymmetric pair-rod arrays are fabricated experimentally, and the minimum LOD is obtained under a critical coupling condition with equal radiative and nonradiative Q factors. The results agree well with the theoretical model derived from the temporal coupled-mode theory. We reveal that the LOD and the optimum asymmetry are significantly influenced by nonradiative losses in the nanostructure, emphasizing the importance of loss reduction in dielectric metasurfaces at quasi-BICs for high-performance refractometric sensors.

権利情報:

• In Copyright
  This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Keisuke Watanabe et al., Appl. Phys. Lett. 124, 111705 (2024) and may be found at https://doi.org/10.1063/5.0158793.

キーワード: metasurfaces, bound states in the continuum, BIC, biosensors

刊行年月日: 2024-03-11

出版者: AIP Publishing

掲載誌:

• Applied Physics Letters (ISSN: 00036951) vol. 124 111705

研究助成金:

• Japan Society for the Promotion of Science JP22K20496
• Murata Science Foundation

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4464

公開URL: https://doi.org/10.1063/5.0158793

関連資料:

その他の識別子:

連絡先:

更新時刻: 2024-04-04 08:30:18 +0900

MDRでの公開時刻: 2024-04-04 08:30:18 +0900