Local excitation of surface plasmon polaritons by second-harmonic generation in crystalline organic nanofibers

Surface plasmon polariton excitation by second harmonic generation in single organic nanofibers

“…We have calculated both linear scattering and second harmonic generation (SHG) from a single CNHP4 fiber with a few different widths W and height 100 nm placed on a 40 nm silver film on a quartz substrate [ Fig. 1] using the Greens function area integral equation method [8]. The geometry considered is similar to Refs [8,9].…”

“…We have previously demonstrated that organic nanowires deposited on a thin silver film can act as local nonlinear sources that scatter second harmonic light into plasmons propagating along the silver film [8]. This method has the advantage that the generated SPPs are coherent with the excitation light, and that near-infrared optical signals are converted to SPP signals in the visible range, where they are easier to detect or convert afterwards.…”

Quasi-one-dimensional cyano-phenylene aggregates: Uniform molecule alignment contrasts varying electrostatic surface potential

“…47,48 CNHP4 nanofibers show second order susceptibility χ (2) of the order of 2 pm/V. 49,50 It is therefore also of major interest for nonlinear-optical applications such as the use in organic-plasmonic hybrids. 51 Para-phenylenes without solubilizing side-chains are notoriously difficult to crystallize by conventional solutionassisted methods due to their low solubility.…”

Tunable local excitation of surface plasmon polaritons by sum-frequency generation in ZnO nanowires

“…An essential part of a plasmonic circuit will be the part that efficiently and locally couples the incoming light into SPP's and vice versa [1]. Different approaches to this problem have already been demonstrated such as ridge, slit and grating couplers [2][3][4][5], as well as SPP excitation via scattering or second harmonic generation (SHG) in nanofibers [6,7], four-wave mixing [8], and electrical excitation [9,10].…”

“…Since SFG is a second- order process this excitation method is more general, but conceptually similar to that used in [7], where second-harmonic generation in organic crystalline nanofibers was used to excite SPP's on an air/silver interface. Also, as in [7], the small dimensions of the ZnO nanowires means that they reside within the vertical decay length of the SPP's, which allows for direct coupling of the induced nonlinear dipole moment at the SFG frequency to SPP's at the air/silver interface. A clear difference and advantage of using SFG as a second-order process instead of SHG is the possibility to tune the frequency of the launched SPP's independent of the frequency of one the excitation beams.…”