title: Far-field control of focusing plasmonic waves through disordered nanoholes.
abstract: Control of near-field waves is the key to going beyond the diffraction limit in imaging and manipulating target objects. Here we present the focusing of plasmonic waves, a type of near-field waves, by the wavefront shaping of far-field waves. We coupled far-field waves to a random array of holes on a thin gold film to generate speckled plasmonic waves. By controlling the phase pattern of the incident waves with the wavelength of 637 nm, we demonstrated the focusing of plasmonic waves down to 170 nm at arbitrary positions. Our study shows the possibility of using disordered nanoholes as a plasmonic lens with high flexibility in the far-field control.
authors.forename: Eunsung
authors.initials: E
authors.lastname: Seo
authors.forename: Joonmo
authors.initials: J
authors.lastname: Ahn
authors.forename: Wonjun
authors.initials: W
authors.lastname: Choi
authors.forename: Hakjoon
authors.initials: H
authors.lastname: Lee
authors.forename: Young Min
authors.initials: YM
authors.lastname: Jhon
authors.forename: Sanghoon
authors.initials: S
authors.lastname: Lee
authors.forename: Wonshik
authors.initials: W
authors.lastname: Choi