Using time-resolved two-photon photoemission electron microscopy (PEEM), we experimentally recorded attosecond videos revealing evanescent vortex creations in a chiral plasmonic device even under linearly-polarized optical excitation. Moreover, the resulting vortex fields generate topological quasiparticles at the metal surface similar to magnetic skyrmions. We discover the stable creation of three plasmonic merons at the vortex core in the nano-femto scale.

https://doi.org/10.1038/s41586-020-3030-1

http://web.ee.nthu.edu.tw/p/405-1175-197121,c5814.php?Lang=zh-tw

A polarization-actuated circulator for surface plasmon polaritons (SPPs) is experimentally realized in the optical regime for the first time. We demonstrate circulations of SPPs can be actuated either by linearly polarized excitation or by spin angular momenta carried by circular polarizations. Experimentally, a wide optical operational bandwidth of ~ 100 nm is achieved.

https://doi.org/10.1021/acs.nanolett.0c03008

A simple plasmonic nanostructure is designed to allow polarization‐sensitive directional steering of surface plasmon polaritons (SPPs). Based on crossed Babinet‐inverted nanoantennas, steering of SPPs in the full first quadrant with high sensitivity to the linear polarization of the monochromatic exciting source is numerically and experimentally demonstrated. The same device could also function as a polarization‐driven power‐splitter.

https://doi.org/10.1002/lpor.202000076

We demonstrate for the first time, second-harmonic generation (SHG) is allowed through the control of optical modal asymmetry rather than breaking the symmetry of material or geometry. Our idea is realized through a plasmonic two-wire transmission-line. As compared to other SHG using surface plasmon polaritons, our second-harmonic signal remains guided.

https://doi.org/10.1021/acs.nanolett.9b02630

Talbot self-imaging is experimentally extended to cylindrical coordinate for the first time. Intensity petal repetition multiplication in the azimuthal angle of arbitrary multiplicative factor is demonstrated.

https://doi.org/10.1364/OL.43.004033