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(a) SEM images of a diameter SPP, the arrow indicates the laser writing scan direction. (b) Optical profilometry image of a diameter SPP with for an operating wavelength in air . (c) Atomic force microscope image of the SPP surface. (d) and (e) Top-view SEM image of an array of SPPs and a single SPP suspended in the air, respectively. (f) Three-dimensional view of the structure shown in panel (e) where each point refers to the location of a laser written voxel.
Far field intensity pattern when a focused Gaussian beam (waist ) is normally incident onto a SPP (radius ) located in the focal plane of the incident beam with different integer topological charges . The data correspond to with and the distance between the SPP plane and the observation plane is a few tens of the Rayleigh distance. Upper row: experimental data. Bottom row: calculated profiles.
Diffraction intensity patterns at different observation planes for with and . Upper row: experimental data. Bottom row: calculated profiles where the value of is adjusted to visually match the observed pattern.
Spiraling diffraction intensity patterns in the observation planes where a well-defined -fold symmetry is visible. Here with and . Upper row: experimental data. Bottom row: calculated profiles where the value of is adjusted to visually match the observed pattern.
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