Angular-momentum-dependent splitting of light through metal nanohole

Dejiao Hu; Yu Liu; ZhiYou Zhang; Xiao Xiao; JingLei Du

doi:10.1117/12.2073327

6 November 2014 Angular-momentum-dependent splitting of light through metal nanohole

Dejiao Hu, Yu Liu, ZhiYou Zhang, Xiao Xiao, JingLei Du

Proceedings Volume 9272, Optical Design and Testing VI; 92721J (2014) https://doi.org/10.1117/12.2073327
Event: SPIE/COS Photonics Asia, 2014, Beijing, China

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.

Citation Download Citation

Dejiao Hu, Yu Liu, ZhiYou Zhang, Xiao Xiao, and JingLei Du "Angular-momentum-dependent splitting of light through metal nanohole", Proc. SPIE 9272, Optical Design and Testing VI, 92721J (6 November 2014); https://doi.org/10.1117/12.2073327

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KEYWORDS

Polarization

Metals

Beam splitters

Plasmonics

Silver

Wave plates

Optical simulations

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