Abstract
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.
Highlights
Surface plasmon polaritons (SPPs) are electromagnetic surface waves confined to propagate at the interface of a metal and a dielectric, involving both a charge oscillation of free electrons in the metal and an evanescent electric field extending into the dielectric.[1]
The metalens has the ability to steer SPPs between several foci on the surface based on the incident wavelength and has on/off switchability based on the incident polarization
Our design is straightforward and consists of placing nonresonant nanoslits (50 nm wide, 200 nm long) along the contours defined by the wavefront of SPPs propagating out from an imaginary emitter placed at the location on the surface where we want SPP focusing
Summary
Daniel, Patrice Genevet, Antonio Ambrosio, Alex Woolf, and Federico Capasso. 2015. “Holographic Metalens for Switchable Focusing of Surface Plasmons.”. This article was downloaded from Harvard University’s DASH repository, WARNING: This file should NOT have been available for downloading from Harvard University’s DASH repository. Daniel Wintz,† Patrice Genevet,†,‡ Antonio Ambrosio,†,§ Alex Woolf,† and Federico Capasso*,†
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