Creating Optical Near-Field Orbital Angular Momentum in a Gold Metasurface

Nanocavities inscribed in a gold thin film are optimized and designed to form a metasurface. We demonstrate both numerically and experimentally the creation of surface plasmon (SP) vortex carrying orbital angular momentum in the metasurface under linearly polarized optical excitation that carries no...

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Bibliographic Details
Published inNano letters Vol. 15; no. 4; pp. 2746 - 2750
Main Authors Chen, Ching-Fu, Ku, Chen-Ta, Tai, Yi-Hsin, Wei, Pei-Kuen, Lin, Heh-Nan, Huang, Chen-Bin
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 08.04.2015
Subjects
Angular momentum
Excitation
Fluid flow
Focusing
Gold
Nanostructure
Orbitals
Vortices
Orbital angular momentum
optical vortex
plasmonics
metasurface
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Summary:Nanocavities inscribed in a gold thin film are optimized and designed to form a metasurface. We demonstrate both numerically and experimentally the creation of surface plasmon (SP) vortex carrying orbital angular momentum in the metasurface under linearly polarized optical excitation that carries no optical angular momentum. Moreover, depending on the orientation of the exciting linearly polarized light, we show that the metasurface is capable of providing dynamic switching between SP vortex formation or SP subwavelength focusing. The resulting SP intensities are experimentally measured using a near-field scanning optical microscope and are found in excellent quantitative agreements as compared to the numerical results.
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ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.5b00601