Polarization-switchable nanoripples fabricated on a silicon surface by femtosecond-laser-assisted nanopatterning

Huachao Cheng, Peng Li, Sheng Liu, Hua Lu, Lei Han, Jianlin Zhao

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The polarization ripples on many materials have been intensively studied and have yielded significant applications such as modulating light fields, building hydrophobic or hydrophilic surfaces, and fabricating tunable thermal sources. It was shown that ripples are closely dependent on the ablation threshold of laser fluence and orientation of laser polarization. Here we demonstrate that laser polarization ellipticity also represents the switching effect on the formation of ripples. Two significantly different damage morphologies, ripples and hollows, are respectively observed below and above the switching value of incident laser polarization ellipticity. Furthermore, it is demonstrated that this ellipticity switching value varies with laser pulse energy and pulse number. These intriguing phenomena are qualitatively explained using a laser–surface plasmon polariton interference mechanism. Finally, we achieve the analogous laser-assisted nanopatterning by using a femtosecond laser beam with spatially inhomogeneous polarization state, demonstrating the application potential of these switchable nanoripples in laser-assisted nanopatterning.

Original languageEnglish
Pages (from-to)7211-7216
Number of pages6
JournalApplied Optics
Volume59
Issue number24
DOIs
StatePublished - 20 Aug 2020

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