integration, device-to-device communication, and bilateral transduction between electrons and photons [26].
An optical gapantenna typically consists of two nanostructures with a nanometer gap in between. Optical excitation induces a coupled plasmon oscillation along the two antenna parts, which can lead to
Beilstein J. Nanotechnol.2018,9, 1964–1976, doi:10.3762/bjnano.9.187
= 5.6·10−8 μS = 7·10−4 G0. The spectrum emitted by the optical tunneling gapantenna is consistent with the quantum cutoff; the energy of the detected photons is smaller than the kinetic energy of the tunnel electrons. The substantial drop of intensity below 600 nm is due to the onset of interband
electromigrating in situ the nanowire to create the optical tunneling gapantenna. Figure 6a,c,e illustrates the experiment with different waveguide geometries and gap orientations. In Figure 6a, the TiO2 waveguide is 85 nm thick and 1.5 μm wide, and the SEM image was taken before the electromigration of the
show also that light emerges from the distal end of the TiO2 stripes indicating that a portion of the power emitted by the electron-fed antennas is coupled to the dielectric structure and is transmitted away from the radiating feedgap. The optical tunneling gapantenna may therefore be used as an
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Figure 1:
(a) False-color scanning electron micrograph of a typical constriction separating two tapered elect...