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.
© 2010 Optical Society of AmericaFull Article | PDF Article
Karlton Crabtree, Jeffrey A. Davis, and Ignacio Moreno
Appl. Opt. 43(6) 1360-1367 (2004)
Q. Wang, X. W. Sun, and P. Shum
Appl. Opt. 43(11) 2292-2297 (2004)
Ignacio Moreno, Jeffrey A. Davis, B. Melvin L. Pascoguin, Mark J. Mitry, and Don M. Cottrell
Opt. Lett. 34(19) 2927-2929 (2009)