title: Visualizing surface plasmon polaritons by their gradient force.
abstract: A new method is presented for visualizing the electric field distributions associated with propagating surface-plasmon-polariton (SPP) modes directly in the near-field. The method is based on detecting the photo-induced gradient force exerted by the evanescent field onto a sharp and polarizable tip. Using a photo-induced force microscope (PiFM), images of propagating SPPs are obtained on flat gold surfaces.
authors.forename: Junghoon
authors.initials: J
authors.lastname: Jahng
authors.forename: Faezeh Tork
authors.initials: FT
authors.lastname: Ladani
authors.forename: Ryan Muhammad
authors.initials: RM
authors.lastname: Khan
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Li
authors.forename: Eun Seong
authors.initials: ES
authors.lastname: Lee
authors.forename: Eric Olaf
authors.initials: EO
authors.lastname: Potma