Ultrathin plasmonic chiral phase plate

Yuri Gorodetski; Cyriaque Genet; Thomas W. Ebbesen

doi:10.1364/OL.41.004390

Ultrathin plasmonic chiral phase plate

Yuri Gorodetski, Cyriaque Genet, Thomas W. Ebbesen

Department of Mechanical Engineering and Mechatronics

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

A thin free-standing gold membrane with complex plasmonic structures engraved on both sides is shown to perform as an ultrathin phase plate. Specifically, we demonstrate the generation of a far-field vortex beam propagating at a desired angle. The angular momentum of the beam is generated by the groove helicity, together with the geometric phase arising from a plasmonic spin-orbit interaction. The radial chirp of the back-side structure is used to modify the emission angle via a specific momentum matching condition.

Original language	English
Pages (from-to)	4390-4393
Number of pages	4
Journal	Optics Letters
Volume	41
Issue number	18
DOIs	https://doi.org/10.1364/OL.41.004390
State	Published - 15 Sep 2016

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abstract = "A thin free-standing gold membrane with complex plasmonic structures engraved on both sides is shown to perform as an ultrathin phase plate. Specifically, we demonstrate the generation of a far-field vortex beam propagating at a desired angle. The angular momentum of the beam is generated by the groove helicity, together with the geometric phase arising from a plasmonic spin-orbit interaction. The radial chirp of the back-side structure is used to modify the emission angle via a specific momentum matching condition.",

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Ultrathin plasmonic chiral phase plate

Abstract

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