Surface plasmon polariton compression through radially and linearly polarized source

Abstract

We report on the possibility of realizing a radial mode on a metallic conical structure by means of a linearly polarized incident wave. This result is utilized for observing surface plasmon polaritons adiabatic compression on a tapered conical nanostructure. The ingredients for radial mode generation are described in terms of phase-matching of the components of the electromagnetic field. We conclude by showing the robustness of this approach, explaining the polaritonic behavior as a function of the device geometry.

Novel Plasmonic Probes and Smart Superhydrophobic Devices, New Tools for Forthcoming Spectroscopies at the Nanoscale

“…It sustains the propagation of electromagnetic field as SPPs till the apex, either in lossy [38,39] or in adiabatic mode [40,41]. The propagation along conical structures has been widely studied in literature [42,43]. Specifically, a conical plasmonic waveguide efficiently propagates radial modes [43][44][45][46], i.e.…”

The magic of nanoplasmonics: from superhydrophobic and 3D suspended devices for SERS/TERS-like applications to hot-electrons based nanoscopy

“…In fact it has been shown that a TM0 mode within the structure is needed in order to obtain the phenomenon [12][13][14]. This means that the propagating plasmon needs a particular symmetry in order to be squeezed along a tapered structure.…”

“…Figure 1: a) Electric field in the x direction for a SP propagating in a conical structure. The anti-phase (AP) configuration enables a TM0 mode satisfying the requirements for the adiabatic compression [12]. b) Dependence of the real part of the effective refractive index on the radius value of a metallic cylinder [5].…”

“…c) Electric field in the x direction for a SP propagating in a conical structure. The in-phase condition (P) does not allow adiabatic compression and field concentration at the tip [12]. d) Oscillating charge distribution for a given section of the cone in a TM0 mode.…”

“…However, it has been shown that also a tilted linearly polarized EM wave can trigger the adiabatic compression, thus leading to sensitively simplified experimental setups [12,14].…”