Femtosecond pulse induced defects and laser induced periodic surface structures (LIPSS) in β-Ga2O3

Daram N. Ramdin; Emma DeAngelis; Mohamed Yaseen Noor; Micah S. Haseman; Leonard J. Brillson; Enam Chowdhury

doi:10.1117/12.2641262

2 December 2022 Femtosecond pulse induced defects and laser induced periodic surface structures (LIPSS) in β-Ga203

Daram N. Ramdin, Emma DeAngelis, Mohamed Yaseen Noor, Micah S. Haseman, Leonard J. Brillson, Enam Chowdhury

Proceedings Volume PC12300, Laser-Induced Damage in Optical Materials 2022; PC1230005 (2022) https://doi.org/10.1117/12.2641262
Event: SPIE Laser Damage, 2022, Rochester, New York, United States

Abstract

Cathodoluminescence and electrostatic techniques were used to study the nanoscale spatial evolution of native defects, crystallinity and work function in Ga2O3 across different morphological regions in laser induced periodic surface structures generated by an ultrafast laser. An emergent ~2.4 eV emission, likely related to oxygen interstitials or divacancy complexes, inversely correlates with the crystallinity of these regions. A contrast in work functions between the rims and troughs of the LIPSS, indicative of periodic differences in defect concentration, correlates with a reduction of crystallinity in the rim region relative to the trough region, suggesting an increased concentration of relatively shallow defects.

Conference Presentation

Citation Download Citation

Daram N. Ramdin, Emma DeAngelis, Mohamed Yaseen Noor, Micah S. Haseman, Leonard J. Brillson, and Enam Chowdhury "Femtosecond pulse induced defects and laser induced periodic surface structures (LIPSS) in β-Ga203", Proc. SPIE PC12300, Laser-Induced Damage in Optical Materials 2022, PC1230005 (2 December 2022); https://doi.org/10.1117/12.2641262

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