Plasmonic tomography of optical vortices |
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Authors: | Chimento Philip F 't Hooft Gert W Eliel Eric R |
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Institution: | Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands. chimento@molphys.leidenuniv.nl |
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Abstract: | We present a method for analyzing the wavefront of optical vortices that does not involve interferometry but rather uses surface plasmon polaritons (SPPs). We employ a subwavelength slit in a gold film to cut slices from an optical vortex beam and measure the diffraction of the generated SPPs by scattering them off a second slit. By moving the slits across the vortex beam, we create a tomogram, from which we can determine the vortex charge of the incident beam at a glance. We present results for vortex beams of integer- and half-integer-vortex charge. |
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