Irradiance enhancement and increased laser damage threshold in As₂S₃ moth-eye antireflective structures
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Weiblen, R. Joseph, Catalin M. Florea, Lynda E. Busse, L. Brandon Shaw, Curtis R. Menyuk, Ishwar D. Aggarwal, and Jasbinder S. Sanghera. “Irradiance Enhancement and Increased Laser Damage Threshold in As₂S₃ Moth-Eye Antireflective Structures.” Optics Letters 40, no. 20 (October 15, 2015): 4799–4802. https://doi.org/10.1364/OL.40.004799.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
It has been experimentally observed that moth-eye antireflective microstructures at the end of As₂S₃ fibers have an increased laser damage threshold relative to thin-film antireflective coatings. In this work, we computationally study the irradiance enhancement in As₂S₃ moth-eye antireflective microstructures in order to explain the increased damage threshold. We show that the irradiance enhancement occurs mostly on the air side of the interfaces and is minimal in the As₂S₃ material. We give a physical explanation for this behavior.