Nonlinear absorption and optical damage threshold of carbon-based nanostructured material embedded in a protein
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Abstract
Physical processes in laser–matter interaction used to be determined by generation of fast electrons resulting from efficient conversion of the absorbed laser radiation. Composite materials offer the possibility to control the absorption by choice of the host material and dopants. Reported here strong absorption of ultrashort laser pulse in a composite carbon-based nanomaterial including single-walled carbon nanotubes (SWCNTs) or multilayer graphene was measured in the intensity range between 1012 and 1016 W cm−2. A protein (lysozyme) was used as the host. The maximum absorption of femtosecond laser pulse has reached 92–96 %. The optical damage thresholds of the coatings were registered at an intensity of (1.1 ± 0.5) × 1013 W cm−2 for the embedded SWCNTs and at (3.4 ± 0.3) × 1013 W cm−2 for the embedded graphene. Encapsulated variant of the dispersed nanomaterial was investigated as well. It was found that supernatant protein in the coating material tends to dominate the absorption process, independently of the embedded nanomaterial. The opposite was observed for the encapsulated material.
Keywords
Lysozyme Sapphire Substrate Host Material Saturable Absorber Ultrashort Laser PulseNotes
Acknowledgments
This work was supported by the Ministry of Education, Science and Technology of Korea through Basic Science Research Program (No.R15-2008-006-03001-00), by the Institute for Basic Science (IBS), by the Gwangju Institute of Science and Technology through the Photonics 2020 project. Support by the World Class University program (R31-2008-000-10026-0) of National Research Foundation (NRF) of Korea is also acknowledged. AH was responsible for the interaction experiment and DJ for the target preparation.
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