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Ordered nanostructures written directly by laser interference.

C Tan1, C S Peng, J Pakarinen

  • 1Optoelectronics Research Centre, Tampere University of Technology, Tampere, Finland. chunlei.tan@tut.fi

Nanotechnology
|May 8, 2009
PubMed
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A simplified laser interference lithography method fabricates ordered nanostructures without resist. This technique creates periodic arrays of sub-30nm holes in GaAs, offering a direct fabrication pathway.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Fabricating ordered nanostructures is crucial for advanced materials and devices.
  • Traditional methods often require complex processes and specialized materials like resists.
  • Developing simplified, direct-write techniques is a key research area.

Purpose of the Study:

  • To introduce a simplified laser interference lithography (LIL) method for fabricating ordered nanostructures.
  • To demonstrate the direct writing of nanostructures without the need for resists or elaborate processes.
  • To present a model for interpreting the results of the proposed LIL technique.

Main Methods:

  • Utilized a four-beam laser interference setup to generate interference patterns.
  • Applied the interference patterns directly onto a Gallium Arsenide (GaAs) sample.

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  • Fabricated periodic arrays of holes, some with diameters below 30 nm, covered with silicon dioxide (SiO2) bubbles.

    • Main Results:

    • Successfully fabricated ordered nanostructures with sub-30nm feature sizes.
    • Demonstrated a resist-free and simplified fabrication process using LIL.
    • Observed periodic arrays of holes in GaAs, encapsulated by SiO2 bubbles.

    Conclusions:

    • The simplified LIL method is effective for direct fabrication of nanoscale periodic structures.
    • The technique eliminates the need for resists, streamlining the nanostructure fabrication process.
    • A model has been proposed to explain the observed nanostructure formation and characteristics.