Abstract

We report a highly efficient generation of singular surface plasmon (SP) fields by an achiral plasmonic structure consisting of $\mathrm{\Lambda }$-shaped apertures. Our quantitative analysis, based on leakage radiation microscopy (LRM), demonstrates that the induced spin-orbit coupling can be tuned by adjusting the apex angle of the $\mathrm{\Lambda }$-shaped aperture. Specifically, the array of $\mathrm{\Lambda }$-shaped apertures with the apex angle 60° is shown to give rise to the directional coupling efficiency. The ring of $\mathrm{\Lambda }$-shaped apertures with the apex angle 60° was found to generate the maximum extinction ratio ($\mathrm{ER}=11$) for the SP singularities between two different polarization states. This result provides a more efficient way for developing an SP focusing and an SP vortex in the field of nanophotonics such as optical tweezers.

© 2016 Optical Society of America

Spin-orbital angular momentum tomography of a chiral plasmonic lens using leakage radiation microscopy

Airong Zhao, Aline Pham, Nessim Jebali, and Aurélien Drezet
Opt. Lett. 43(8) 1918-1921 (2018)

Ultrathin plasmonic chiral phase plate

Yuri Gorodetski, Cyriaque Genet, and Thomas W. Ebbesen
Opt. Lett. 41(18) 4390-4393 (2016)

Plasmonic fork-shaped hologram for vortex-beam generation and separation

Airong Zhao, Aline Pham, and Aurélien Drezet
Opt. Lett. 46(3) 689-692 (2021)

Optical lattice induced by angular momentum and polygonal plasmonic mode

Yu Wang, Yuntao Xu, Xue Feng, Peng Zhao, Fang Liu, Kaiyu Cui, Wei Zhang, and Yidong Huang
Opt. Lett. 41(7) 1478-1481 (2016)

Cascaded parametric amplification for highly efficient terahertz generation

Koustuban Ravi, Michael Hemmer, Giovanni Cirmi, Fabian Reichert, Damian N. Schimpf, Oliver D. Mücke, and Franz X. Kärtner
Opt. Lett. 41(16) 3806-3809 (2016)