Holographic detection of the orbital angular momentum of light with plasmonic photodiodes

Patrice Genevet, Jiao Lin, Mikhail A. Kats and Federico Capasso ()
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Patrice Genevet: School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, McKay 125
Jiao Lin: School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, McKay 125
Mikhail A. Kats: School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, McKay 125
Federico Capasso: School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, McKay 125

Nature Communications, 2012, vol. 3, issue 1, 1-5

Abstract: Abstract Metallic components such as plasmonic gratings and plasmonic lenses are routinely used to convert free-space beams into propagating surface plasmon polaritons and vice versa. This generation of couplers handles relatively simple light beams, such as plane waves or Gaussian beams. Here we present a powerful generalization of this strategy to more complex wavefronts, such as vortex beams that carry orbital angular momentum, also known as topological charge. This approach is based on the principle of holography: the coupler is designed as the interference pattern of the incident vortex beam and focused surface plasmon polaritons. We have integrated these holographic plasmonic interfaces into commercial silicon photodiodes, and demonstrated that such devices can selectively detect the orbital angular momentum of light. This holographic approach is very general and can be used to selectively couple free-space beams into any type of surface wave, such as focused surface plasmon polaritons and plasmonic Airy beams.

Date: 2012
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DOI: 10.1038/ncomms2293

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