School of Physics - Theses

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    Characterisation of sub-radiant modes of metasurfaces
    Achmari, Panji ( 2016)
    Metallic nanostructures can be utilised as optical antennas: devices to assist the conversion between localised (near-field) and propagating (far-field) light. Optical antennas possess sub-radiant modes which cannot be easily coupled to propagating fields and have the advantages of longer life-times and higher Q resonances. This project has involved the computational and experimental investigation of the properties of sub-radiant modes of various nanoantennas that form the basis of a metasurface. These modes were found to be excited by off-normally incident light with a specific polarisation or vector beams with radial or azimuthal polarisation. It was also shown through studies of the optical far-field that the angular spectrum of the reflected fields was modified through interaction via a sub-radiant mode.