Simulational investigation of self-aligned bilayer linear grating enabling highly enhanced responsivity of MWIR InAs/GaSb type-II superlattice (T2SL) photodetectoropen access
- Authors
- Lee, Minseok; Ku, Zahyun; Jeong, Seungjin; Hwang, Jehwan; Lee, Junghyun; Kim, Junoh; Kang, Sang-Woo; Urbas, Augustine; Bae, Hagyoul; Kim, Bongjoong
- Issue Date
- Jan-2024
- Publisher
- Nature Research
- Citation
- Scientific Reports, v.14, no.1
- Journal Title
- Scientific Reports
- Volume
- 14
- Number
- 1
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/32624
- DOI
- 10.1038/s41598-024-52113-4
- ISSN
- 2045-2322
- Abstract
- Linear gratings polarizers provide remarkable potential to customize the polarization properties and tailor device functionality via dimensional tuning of configurations. Here, we extensively investigate the polarization properties of single- and double-layer linear grating, mainly focusing on self-aligned bilayer linear grating (SABLG), serving as a wire grid polarizer in the mid-wavelength infrared (MWIR) region. Computational analyses revealed the polarization properties of SABLG, highlighting enhancement in TM transmission and reduction in TE transmission compared to single-layer linear gratings (SLG) due to optical cavity effects. As a result, the extinction ratio is enhanced by approximately 2724-fold in wavelength 3–6 μm. Furthermore, integrating the specially designed SABLG with an MWIR InAs/GaSb Type-II Superlattice (T2SL) photodetector yields a significantly enhanced spectral responsivity. The TM-spectral responsivity of SABLG is enhanced by around twofold than the bare device. The simulation methodology and analytical analysis presented herein provide a versatile route for designing optimized polarimetric structures integrated into infrared imaging devices, offering superior capabilities to resolve linear polarization signatures. © 2024, The Author(s).
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Collections - College of Engineering > Department of Mechanical and System Design Engineering > 1. Journal Articles
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