Optical anisotropy induced by oblique incidence ion bombardment of Ag(001)

Wormeester, H. (Speaker), Frank Everts (Contributor), Poelsema, B. (Contributor)

Activity: Talk or presentationOral presentation

Description

Oblique incidence ion sputtering has become a widely used method for the creation of highly regular patterns of lines and dots. On a Ag(001) surface oblique incidence sputtering creates a ripple pattern that exhibits plasmonic features. The photon energy of the plasmonic feature depends on the ripple periodicity. The development of these anisotropic features was measured in-situ with the optical technique Reflection Anisotropy Spectroscopy (RAS) for 2 keV Ar ions with a flux of a few µ A/cm2 in a temperature range of 300 - 420K. With RAS, a periodicity of ripples above 200 nm is measured by a shift in photon energy of the plasmon resonance. Features with a smaller periodicity show a plasmon resonance around 3.65 eV. The Rayleigh-Rice description for scattering from a slightly rough surface enables to relate the measured plasmonic feature quantitatively to the ripple’s rms, wavelength and wavelength distribution. Ripple patterns created with ions at 70∘ and 80∘ polar angles of incidence are compared. High resolution LEED measurements after sputtering are used to determine the facet angles of the created ripples.
Period29 Feb 2008
Held atDPG Frühjahrstagung 2008 Berlin
Event typeConference
LocationBerlin, Germany
Degree of RecognitionInternational

Keywords

  • METIS-251315