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Austin DR, Kafka KR, Trendafilov S, et al. Laser induced periodic surface structure formation in germanium by strong field mid IR laser solid interaction at oblique incidence. Opt Express. 2015;23(15):19522-34doi: 10.1364/OE.23.019522.
Austin, D. R., Kafka, K. R., Trendafilov, S., Shvets, G., Li, H., Yi, A. Y., Szafruga, U. B., Wang, Z., Lai, Y. H., Blaga, C. I., DiMauro, L. F., & Chowdhury, E. A. (2015). Laser induced periodic surface structure formation in germanium by strong field mid IR laser solid interaction at oblique incidence. Optics express, 23(15), 19522-34. https://doi.org/10.1364/OE.23.019522
Austin, Drake R, et al. "Laser induced periodic surface structure formation in germanium by strong field mid IR laser solid interaction at oblique incidence." Optics express vol. 23,15 (2015): 19522-34. doi: https://doi.org/10.1364/OE.23.019522
Austin DR, Kafka KR, Trendafilov S, Shvets G, Li H, Yi AY, Szafruga UB, Wang Z, Lai YH, Blaga CI, DiMauro LF, Chowdhury EA. Laser induced periodic surface structure formation in germanium by strong field mid IR laser solid interaction at oblique incidence. Opt Express. 2015 Jul 27;23(15):19522-34. doi: 10.1364/OE.23.019522. PMID: 26367610.
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Opt Express. 2015 Jul 27;23(15):19522-34. doi: 10.1364/OE.23.019522.

Laser induced periodic surface structure formation in germanium by strong field mid IR laser solid interaction at oblique incidence.

Optics express

Drake R Austin, Kyle R P Kafka, Simeon Trendafilov, Gennady Shvets, Hui Li, Allen Y Yi, Urszula B Szafruga, Zhou Wang, Yu Hang Lai, Cosmin I Blaga, Louis F DiMauro, Enam A Chowdhury

PMID: 26367610 DOI: 10.1364/OE.23.019522

Abstract

Laser induced periodic surface structures (LIPSS or ripples) were generated on single crystal germanium after irradiation with multiple 3 µm femtosecond laser pulses at a 45° angle of incidence. High and low spatial frequency LIPSS (HSFL and LSFL, respectively) were observed for both s- and p-polarized light. The measured LSFL period for p-polarized light was consistent with the currently established LIPSS origination model of coupling between surface plasmon polaritons (SPP) and the incident laser pulses. A vector model of SPP coupling is introduced to explain the formation of s-polarized LSFL away from the center of the damage spot. Additionally, a new method is proposed to determine the SPP propagation length from the decay in ripple depth. This is used along with the measured LSFL period to estimate the average electron density and Drude collision time of the laser-excited surface. Finally, full-wave electromagnetic simulations are used to corroborate these results while simultaneously offering insight into the nature of LSFL formation.

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