Figure 3
(a) Ring sample 2 is covered with a gold coated microscope slide mask and then progressively uncovered allowing more of the ring to be illuminated. The laser illumination spot has been centered such that it equally illuminates the entire ring when not blocked by the mask. Results are obtained below and in the plane of the ring. (b) Polarization curve of sample 1, half and fully illuminated. Power is measured below the ring. The fully illuminated ring does not appear to display any linear polarization. In both plots results are normalized to the maximum power in the plot \({P}_{max}\).
