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Proceedings Paper

Angular-momentum-dependent splitting of light through metal nanohole
Author(s): Dejiao Hu; Yu Liu; ZhiYou Zhang; Xiao Xiao; JingLei Du
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Paper Abstract

We numerically study the splitting of light beam which carries orbital angular momentum (OAM) through single metal nano-scale hole. A light beam carrying with OAM has a helical phase distribution in the transverse plane, where the electric field has the form: E(r,θ)=E0exp(lθ), and l is the topological charge which denotes the value of OAM. The circular polarization state is corresponding to the spin angular momentum (SAM), where s=+1 represents the left-handed polarization and s=-1 the right-handed polarization. Simulation results show l dependent splitting of beam through nano metal hole. When l is odd, the transmitted far field splits while no splitting happens when l is even. This phenomenon is attributed to the interaction between OAM beam and plasmonic mode of metal nano-hole. It is revealed that different OAM beam can excite different transverse mode in the metal cavity, which means the interaction should obey an OAM section rule. We show that even l can excite transverse mode with zero total AM and odd l can excite transverse mode with non-zero total AM within the hole. Orbital-spin conversion is also revealed in the free wave/plasmon interaction.

Paper Details

Date Published: 6 November 2014
PDF: 6 pages
Proc. SPIE 9272, Optical Design and Testing VI, 92721J (6 November 2014); doi: 10.1117/12.2073327
Show Author Affiliations
Dejiao Hu, Sichuan Univ. (China)
Yu Liu, Sichuan Univ. (China)
ZhiYou Zhang, Sichuan Univ. (China)
Xiao Xiao, Sichuan Univ. (China)
JingLei Du, Sichuan Univ. (China)

Published in SPIE Proceedings Vol. 9272:
Optical Design and Testing VI
Yongtian Wang; Chunlei Du; José Sasián; Kimio Tatsuno, Editor(s)

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