Understanding the chemical and physical properties of nanostructured surfaces is important for further material development and new applications. In this talk, we will report our recent results on investigating nanostructured polymer and metal surfaces using second order nonlinear spectroscopy. First, we performed vibrationally-resonant sum frequency generation (VR-SFG) spectroscopy on PMMA nanostructured surfaces to understand why these surfaces have significant effect on the survival of bacteria and adhesion of cells. The observed VR-SFG intensity and spectral features show intriguing dependence on the size of nanopillars and orientation of nanolines, suggesting that the abundance of molecular moieties is strongly affected by the morphology of nanostructured PMMA. Second, we carried out second harominc generation (SHG) spectroscopy on gold nanocrescent arrays to study the fundamental relationship between properties of localized surface plasmon resonance (LSPR) and their nonlisnear optical responses. The wavelength and polarization dependence of SH response showed that the effects of higher-order LSPRs, such as quadrupole and octupole resonances are important and need to be taken into account.

Investigating the properties of nanostructured surfaces by second order nonlinear spectroscopy

256th National Meeting (2018)

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