The effect of oxidation on the far-field scattering of aluminium patch antennae from visible to UV

McArthur, Duncan and Papoff, Francesco (2019) The effect of oxidation on the far-field scattering of aluminium patch antennae from visible to UV. International Journal of Optics, 2019. pp. 1-5. 9687803. ISSN 1687-9384

[img] Text (McArthur-Papoff-IJO2019-The-effect-of-oxidation-on-the-far-field-scattering-of-aluminium-patch)
McArthur_Papoff_IJO2019_The_effect_of_oxidation_on_the_far_field_scattering_of_aluminium_patch.pdf
Final Published Version
License: Creative Commons Attribution 4.0 logo

Download (649kB)

    Abstract

    In this paper we evaluate the effect of oxidation on the total power scattered in the far field by a 60nm radius Al sphere in the presence of a substrate comprised of either Al or silica (SiO 2). Using an effective medium approach to model the Al particle with an outer layer of alumina (Al 2O 3), we find that the UV peak of total energy scattered in the far field shifts towards longer wavelengths for volume fractions of Al 2O 3 up to 20%. When particles with these volume fractions are held above an Al substrate, enhancement of two orders of magnitudes of the far-field power radiated by a dipole in the gap can be observed. For larger volume fractions of Al 2O 3, the total intensity of light scattered is significantly reduced.