Anisotropic Nanoscale Wrinkling in Solid‐State Substrates. Issue 30 (7th June 2018)

• Record Type: Journal Article
• Authors: Giordano, Maria Caterina; de Mongeot, Francesco Buatier
• Is Part Of: Advanced materials. Volume 30:Issue 30(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-06-07
• Subjects: metamaterials -- nanopatterning -- plasmonics -- self‐organization -- wrinkling; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201801840
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Pattern formation induced by wrinkling is a very common phenomenon exhibited in soft‐matter substrates. In all these systems, wrinkles develop in the presence of compressively stressed thin films lying on compliant substrates. Here, the controlled growth of self‐organized nanopatterns exploiting a wrinkling instability on a solid‐state substrate is demonstrated. Soda‐lime glasses are modified in the surface layers by a defocused ion beam, which triggers the formation of a compressively stressed surface layer deprived of alkali ions. When the substrate is heated up near its glass transition temperature, the wrinkling instability boosts the growth rate of the pattern by about two orders of magnitude. High‐aspect‐ratio anisotropic ripples bound by faceted ridges are thus formed, which represent an optimal template for guiding the growth of large‐area arrays of functional nanostructures. The engineering over large square centimeter areas of quasi‐1D arrays of Au nanostripe dimers endowed with tunable plasmonic response, strong optical dichroism, and high electrical conductivity is demonstrated. These peculiar functionalities allow these large‐area substrates to be exploited as active metamaterials in nanophotonics, biosensing, and optoelectronics. Abstract : A nanoscale wrinkling instability is demonstrated on glass substrates. Wrinkling is a common phenomenon in soft‐matter substrates supporting compressively stressed surface layers, like the skin of dried fruit. Wrinkles are induced on solid‐state substrates by defocused ion beam surface irradiation. The wrinkle nanopatterns are exploited for the engineering of multifunctional nanostripe arrays with optoelectronic and biosensing applications.