1 research outputs found
Holographic Metalens for Switchable Focusing of Surface Plasmons
Surface plasmons polaritons (SPPs)
are light-like waves confined to the interface between a metal and
a dielectric. Excitation and control of these modes requires components
such as couplers and lenses. We present the design of a new lens based
on holographic principles. The key feature is the ability to switchably
control SPP focusing by changing either the incident wavelength or
polarization. Using phase-sensitive near-field imaging of the surface
plasmon wavefronts, we have observed their switchable focusing and
steering as the wavelength or polarization is changed