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Polarization-independent metasurfaces based on bound states in the continuum with high Q-factor and resonance modulation
Publikationstyp
Journal Article
Date Issued
2025-04-01
Sprache
English
Author(s)
Yang, Xingye
Aigner, Andreas
Weber, Thomas
Lee, Yohan
Hu, Haiyang
Journal
Volume
33
Issue
7
Start Page
15682
End Page
15689
Citation
Optics Express 33 (7): 15682-15689 (2025)
Publisher DOI
Scopus ID
Publisher
Optica
Metasurfaces offer a powerful platform for effective light manipulation, which is crucial for advanced optical technologies. While designs of polarization-independent structures have reduced the need for polarized illumination, they are often limited by either low Q factors or low resonance modulation. Here, we design and experimentally demonstrate a metasurface with polarization-independent quasi-bound state in the continuum (quasi-BIC), where the unit cell consists of four silicon squares arranged in a two-dimensional array and the resonance properties can be controlled by adjusting the edge length difference between different squares. Our metasurface experimentally achieves a Q factor of approximately 100 and a resonance modulation of around 50%. This work addresses a common limitation in previous designs, which either achieved high Q factors exceeding 200 with a resonance modulation of less than 10%, leading to challenging signal-to-noise ratio requirements, or achieved strong resonance modulation with Q factors of only around 10, limiting light confinement and fine-tuning capabilities. In contrast, our metasurface ensures that the polarization-independent signal is sharp and distinct within the system, reducing the demands on signal-to-noise ratio and improving robustness. Experiments show the consistent performance across different polarization angles. This work contributes to the development of versatile optical devices, enhancing the potential for the practical application of BIC-based designs in areas such as optical filtering and sensing.
DDC Class
600: Technology