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Modifying the Morphology of Silicon Surfaces by Laser Induced Liquid Assisted Colloidal Lithography

Research output: Contribution to journalArticle

Original languageEnglish
Article number1306
Number of pages6
JournalMaterials
Volume10
Issue number11
Early online date14 Nov 2017
DOIs
DateAccepted/In press - 10 Nov 2017
DateE-pub ahead of print - 14 Nov 2017
DatePublished (current) - Nov 2017

Abstract

Single, or isolated small arrays of, spherical silica colloidal particles (with refractive index ncolloid = 1.47 and radius R = 350 nm or 1.5 μm) were placed on a silicon substrate and immersed in carbon tetrachloride (nliquid = 1.48) or toluene (nliquid = 1.52). Areas of the sample were then exposed to a single laser pulse (8 ps duration, wavelength λ = 355 nm), and the spatial intensity modulation of the near field in the vicinity of the particles revealed via the resulting patterning of the substrate surface. In this regime, ncolloid < nliquid and the near-field optical intensification is concentrated at and beyond the edge of the particle. Detailed experimental characterization of the irradiated Si surface using atomic force microscopy reveals contrasting topographies. The same optical behavior is observed with both liquids, i.e., the incident laser light diverges on interaction with the colloidal particle, but the resulting interaction with the substrate is liquid dependent. Topographic analysis indicates localized ablation and patterning of the Si substrate when using toluene, whereas the patterning induced under carbon tetrachloride is on a larger scale and extends well below the original substrate surface—hinting at a laser induced photochemical contribution to the surface patterning

    Research areas

  • colloids, laser processing, patterning, liquid induced photochemistry

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online MDPI via at http://www.mdpi.com/1996-1944/10/11/1306. Please refer to any applicable terms of use of the publisher.

    Final published version, 1 MB, PDF-document

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