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We will report on our investigations of laser-induced dewetting (in the cw and fs regimes) on thin metallic films deposited on substrates with different nonlocal optical environments. We observed that the morphology of dewetted plasmonic nanostructures is affected by incident pulse duration, and by the nonlocal optical environment. In addition, we will report on a broader effort on understanding mechanisms of short-pulse-induced damage on several materials and structures such as metallic/refractory thin films and metasurface components. We will also present on laser beam shape engineering efforts for damage mitigation in fused silica optics, for applications in extreme environments.
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. 24-FS-015. LLNL-ABS-861157.
Thejaswi Tumkur Umanath,Elias Anwar,Vanessa N. Peters,Eyal Feigenbaum, andMikhail A. Noginov
"Laser-induced dewetting, damage, and mitigation mechanisms in thin films and metasurface components", Proc. SPIE PC13109, Metamaterials, Metadevices, and Metasystems 2024, PC131090M (3 October 2024); https://doi.org/10.1117/12.3029930
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Thejaswi Tumkur Umanath, Elias Anwar, Vanessa N. Peters, Eyal Feigenbaum, Mikhail A. Noginov, "Laser-induced dewetting, damage, and mitigation mechanisms in thin films and metasurface components," Proc. SPIE PC13109, Metamaterials, Metadevices, and Metasystems 2024, PC131090M (3 October 2024); https://doi.org/10.1117/12.3029930