Dynamic cosine-Gauss plasmonic beam through phase control

Abstract

We carry out an approach to dynamic manipulation of a nondiffracting cosine-Gauss plasmonic beam (CGPB) illuminated with an incident phase modulation within nanostructures by a spatial light modulator (SLM). By changing the hologram addressed on the SLM, dynamic control on the lobe width and the propagating direction of the CGPB is experimentally verified. Finally, we demonstrate an application example of this dynamic CGPB in routing optical signals to multichannel subwavelength wave guides through numerical simulation.

Surface‐plasmon wavefront and spectral shaping by near‐field holography

“…a (top)). It has been generated as a nondiffracting plasmonic beam by three different groups by three different methods; one based on a nonholographic method , one based on a holographic far‐field method and one based on the plasmonic NFH . Its first demonstration by Lin et al.…”

“…(b) SEM image of the plasmonic NFH realized for the cosine‐Gauss beam according to (bottom), and the generated beam from that NFH. (c) Simulated (top left) and measured (bottom left) cosine‐Gauss beam and their corresponding cross sections (right) according to . Reproduced with permission .…”

“…(c) Simulated (top left) and measured (bottom left) cosine‐Gauss beam and their corresponding cross sections (right) according to . Reproduced with permission .…”

“…Similarly to the approach used in , Xiao et al. used an SLM for generating the cosine‐Gauss beam in free‐space using a SLM, which then illuminated a metallic grating in order to couple it to a SPP (Fig. c).…”

Dynamical Manipulation of Surface Plasmon Polaritons

“…The amplitude of SPPs is proportional to the intensity of the incident light and the phase is the same as that of the incident light. Based on this feature, the distribution of SPPs can be dynamically manipulated by modulating the excitation light [36][37][38][39][40][41][42][43][44][45]. Another distinctive feature is that the amplitude and phase of the excited SPPs depend heavily on the polarization states of incident light.…”