Damage threshold of poly(methyl methacrylate) (PMMA) nanostructures at MIR resonant frequencies

Joseph T. Harrington; Vladislav V. Yakovlev; Anthony R. Valenzuela

doi:10.1117/12.3033015

18 December 2024 Damage threshold of poly(methyl methacrylate) (PMMA) nanostructures at MIR resonant frequencies

Joseph T. Harrington, Vladislav V. Yakovlev, Anthony R. Valenzuela

Author Affiliations +

Proceedings Volume PC13190, Laser-Induced Damage in Optical Materials 2024; PC131900Y (2024) https://doi.org/10.1117/12.3033015
Event: SPIE Laser Damage, 2024, San Ramon, CA, United States

Conference Poster

Abstract

This study examines the damage threshold of poly(methyl methacrylate) (PMMA) nanostructures when exposed to high-intensity mid-infrared (MIR) light. U-shaped PMMA nanostructures were arranged on a CaF₂ substrate, with resonant frequencies identified between 1724–1730 cm^-1 using FTIR and AFM-IR, corresponding to the carbonyl (C=O) stretching vibration. A femtosecond laser at a 10 kHz repetition rate delivered 180 fs pulses with 9 µJ per pulse and a 100-micron spot size, resulting in rapid damage to the nanostructures. Findings suggest that both resonant absorption and cumulative thermal effects contributed to damage. Future work will explore single-shot pulses and varying intensities to better understand the interplay of resonant absorption and thermal damage, aiding the development of advanced materials for high-intensity MIR applications.

Citation Download Citation

Joseph T. Harrington, Vladislav V. Yakovlev, and Anthony R. Valenzuela "Damage threshold of poly(methyl methacrylate) (PMMA) nanostructures at MIR resonant frequencies", Proc. SPIE PC13190, Laser-Induced Damage in Optical Materials 2024, PC131900Y (18 December 2024); https://doi.org/10.1117/12.3033015

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