Femtosecond laser-induced subwavelength ripples formed by asymmetrical grating splitting

Pin Feng, Lan Jiang, Xin Li, Kaihu Zhang, Xuesong Shi, Bo Li, Yongfeng Lu

Research output: Contribution to journalLetterpeer-review

10 Scopus citations


The formation process and mechanism of subwavelength ripples were studied upon irradiation of ZnO by a femtosecond laser (800 nm, 50 fs, 1 kHz). An abnormally asymmetrical grating-splitting phenomenon was discovered. At relatively high laser fluences (F = 0.51-0.63 J/cm 2 ), near-wavelength ripples were split asymmetrically to create subwavelength laser-induced periodic surface structures (LIPSS) with dual gaps (∼230 nm and ∼430 nm) on the primary grooves. At relatively low laser fluences (F = 0.4-0.45 J/cm 2 ), near-wavelength ripples were split symmetrically, leading to the formation of uniform subwavelength structures with a period of ∼340 nm. The splitting phenomena are related to the varying laser beam dose induced by the overlapping during line scanning. The two grating-splitting types further imply that the dominated mechanism for LIPSS formation may be changed under different processing conditions.

Original languageEnglish (US)
Pages (from-to)52-56
Number of pages5
JournalApplied Surface Science
StatePublished - May 30 2016


  • Femtosecond laser
  • Grating splitting
  • ZnO

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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