Abdelraouf, O. A. M., Wu, M., & Liu, H. (2025). Hybrid Metasurfaces Enabling Focused Tunable Amplified Photoluminescence Through Dual Bound States in the Continuum. Advanced Functional Materials, 35(39). Portico. https://doi.org/10.1002/adfm.202505165
Abstract:
Miniaturized, tunable light sources are essential for integrated photonic devices in quantum computing, communications, and sensing. However, achieving tunable emission post‐fabrication remains challenging, especially for efficient amplification. Hybrid metasurfaces that combine multiple nanostructured materials offer a promising solution, enabling enhanced control and amplification of light emission. Here, tunable amplified photoluminescence (PL) is demonstrated in nanocrystalline silicon (nc‐Si) quantum dots (QDs) embedded in a hybrid metasurface of amorphous silicon (a‐Si) and antimony trisulfide (Sb2S3), a low‐loss phase change material (PCM). The nc‐Si QDs exhibit stable, efficient PL at high temperatures, while the PCM enables tunable phase transitions. The metasurface supports dual quasi‐bound states in the continuum (BICs), achieving Q‐factors up to 225 and amplifying PL by a factor of 15 with a wavelength shift of 105 nm via dimensional modulation. Additionally, all‐optical PL tunability across a 24 nm range is attained through PCM phase modulation. Furthermore, a high Q‐factor metalens is proposed to focus the tunable amplified PL, extending the focused PL tunability into the near‐infrared (NIR). This work advances reconfigurable nanophotonic devices for efficient quantum light sources in photonic systems.
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Funding Info:
This research / project is supported by the A*STAR - Manufacturing, Trade, and Connectivity Programmatic Fund
Grant Reference no. : M23M2b0056
This research / project is supported by the A*STAR - Manufacturing, Trade, and Connectivity Individual Research Grant
Grant Reference no. : M24N7c0087
This research / project is supported by the National Research Foundation - Competitive Research Program
Grant Reference no. : NRF-CRP31-0001
This research / project is supported by the A*STAR - Manufacturing, Trade, and Connectivity Programmatic Fund
Grant Reference no. : M21J9b0085
This research / project is supported by the A*STAR - Career Development Fund
Grant Reference no. : C210112060
This research / project is supported by the A*STAR - Manufacturing, Trade, and Connectivity Young Individual Research Grant
Grant Reference no. : M21K3c0129
Description:
This is the peer reviewed version of the following article: Abdelraouf, O. A. M., Wu, M., & Liu, H. (2025). Hybrid Metasurfaces Enabling Focused Tunable Amplified Photoluminescence Through Dual Bound States in the Continuum. Advanced Functional Materials, 35(39). Portico. https://doi.org/10.1002/adfm.202505165
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