Wide-spectral absorption of femtosecond laser textured germanium
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A4 Artikkeli konferenssijulkaisussa
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en
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2
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Proceedings of the 7th International Conference on Optics, Photonics and Lasers (OPAL' 2024), pp. 56-57
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This work focuses on addressing limitations in the optical properties of germanium (Ge), especially concerning reflections from the planar surface and for sub-bandgap wavelengths (>1.7 µm). To overcome these challenges, femtosecond laser processing is employed. The study explores the impact of fs-laser texturing on crystalline Ge wafers, highlighting the potential benefits of induced surface micro- and nanostructures in improving optical absorption. The experiment involves varying laser power and scan speed, and the results show a significant enhancement in absorptance in a wide spectral range of 0.25 – 2.5 µm. The obtained high absorptance outperforms fs-laser textured silicon at wavelengths exceeding 1 µm, suggesting promising applications for fs-laser-textured Ge in infrared optical and optoelectronic technologies.Description
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Liu, X & Halmela, J 2024, Wide-spectral absorption of femtosecond laser textured germanium. in S Y Yurish (ed.), Proceedings of the 7th International Conference on Optics, Photonics and Lasers (OPAL' 2024)., 022, Omakustanteet Ephemeral Publishers, pp. 56-57, International Conference on Optics, Photonics and Lasers, Palma de Mallorca (Balearic Islands), Spain, 15/05/2024.