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13 March 2024 Ultrafast femtosecond laser processing for broadband emitters
Minok Park, Sean Lubner, Costas Grigoropoulos, Vassilia Zorba
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Proceedings Volume PC12873, Laser-based Micro- and Nanoprocessing XVIII; PC128730K (2024) https://doi.org/10.1117/12.2692946
Event: SPIE LASE, 2024, San Francisco, California, United States
Abstract
We demonstrated laser-induced broadband emitters (LIBEs) with spectral emissivity higher than 0.96 from 0.3 um to 15 um wavelength to increase thermal radiative energy transport. Localized material removal induced by ultrafast femtosecond laser irradiation results in the hierarchical formation of microstructures decorated with micro-/nano- particles, leading to an exceptional enhancement in a spectral absorptivity on different types of substrates. Finite-difference time-domain simulations validated the effects of surface topology on the experimentally measured absorptivity. Moreover, LIBEs maintain their enhanced spectral absorptivity of 0.92 after heating at elevated temperatures for over 100 hours. Our results provide new insights into the use of ultrafast laser-matter interactions in cutting-edge energy harvesting and thermal management applications.
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Minok Park, Sean Lubner, Costas Grigoropoulos, and Vassilia Zorba "Ultrafast femtosecond laser processing for broadband emitters", Proc. SPIE PC12873, Laser-based Micro- and Nanoprocessing XVIII, PC128730K (13 March 2024); https://doi.org/10.1117/12.2692946
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KEYWORDS
Femtosecond phenomena
Laser processing
Ultrafast phenomena
Carbon
Energy harvesting
Metals
Surface properties
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