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.
We investigate the laser damage resistance and optoelectronic properties of thin metallic and semiconducting films used in high power beam steering metasurfaces. We find that gold exhibits the best laser damage resistance, and large absorption losses arising from high carrier concentrations and low mobilities in alternative plasmonic thin films lead to exacerbated degradation and poorer laser damage performance. We will also present results of laser-induced dewetting on thin metallic films deposited on substrates with different optical environments (such as plasmonic films and cavities). We observe that the morphology of dewetting is sensitive to the nonlocal optical environment. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. LLNL-ABS-845919. DE-NA0004007.
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