CMOS Image Sensor With Micro–Nano Holes to Improve NIR Optical Efficiency: Holes on Top Surface Versus on Bottom

Devine, Ekaterina Ponizovskaya; Ahamad, Ahasan; Mayet, Ahmed; Rawat, Amita; Elrefaie, Aly F.; Yamada, Toshio; Wang, Shih-Yuan; Islam, M. Saif

doi:10.1109/jsen.2023.3298529

IEEE Sensors J.

2023

DOI: 10.1109/jsen.2023.3298529

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CMOS Image Sensor With Micro–Nano Holes to Improve NIR Optical Efficiency: Holes on Top Surface Versus on Bottom

Ekaterina Ponizovskaya Devine

Ahasan Ahamad

Ahmed Mayet

et al.

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2024

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Absorption efficiency enhancement of silicon photodetectors via nanophotonic photon management

Vafa,

Florescu

2024

Nanophotonics X

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Efficient and high-speed photodetection in the near-infrared (NIR) is essential in several applications such as LiDAR and imaging. Silicon is an established choice as the base material for absorbing and converting photons to charge carriers. However, its high absorption length in the NIR imposes a trade-off between the absorption efficiency and detection bandwidth. Here, the rigorous coupled-wave analysis method together with the particle swarm optimisation algorithm have been employed to optimise photonic crystal slab architectures with hexagonal symmetry to achieve efficient coupling of incoming pulses of light to the guided modes of the silicon photodetector. Our optimal design yields an ultra-efficient compact photodetector with more than 80% average absorption in the wavelength range 700 -900 nm. Furthermore, considering scatterers of arbitrarily shaped cross-sections significantly augments the landscape in the optimisation parameter space and further enhances the absorption efficiency. Our results show that introducing different length scales in the texturing leads to efficient broadband absorption in the compact device.

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Absorption efficiency enhancement of silicon photodetectors via nanophotonic photon management

Vafa,

Florescu

2024

Nanophotonics X

View full text Add to dashboard Cite

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CMOS Image Sensor With Micro–Nano Holes to Improve NIR Optical Efficiency: Holes on Top Surface Versus on Bottom

Cited by 1 publication

References 12 publications

Absorption efficiency enhancement of silicon photodetectors via nanophotonic photon management

Absorption efficiency enhancement of silicon photodetectors via nanophotonic photon management

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