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External control of the scattering properties of a single optical nanoantenna
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Scanning electron micrograph of three dimer antennas (dashed circles) fabricated by electron beam lithography. The dimers were placed between two macroscopic planar electrodes as shown in the large scale optical image (b). (c)–(e) Confocal scan images of series of antennas obtained with a linear polarization (arrow) and for three values of . The bright spots correspond to the intensity scattered by individual dimers. (f) Schematics of the setup consisting on a low-NA diascopic illumination and a high-NA detection. A beam stop rejects the illumination wavevectors retaining only the large wavevectors scattered by the antennas.

Image of FIG. 2.
FIG. 2.

(a) Dark field spectra of the of for two biases showing the plasmon shift. (b) Intensity and detuning as a function of for the reference and the dimer labeled and for a -polarization. The intensity of is maximal when is the smallest. The voltages comprised within the boxed red region corresponds to the Fréedericksz’s transition of the LCs. (c) and (d) and relative gain as a function of and for two polarizations. The active bias region is situated within the Fréedericksz’s transition.

Image of FIG. 3.
FIG. 3.

(a)–(d) False color CCD images of the angular distribution of the scattered intensity by the reference antenna as a function of applied electric field for a fixed incidence polarization. The orientation of the lobes is rotating with the bias. (e) Azimuthal orientation of the minima of the scattering diagrams as a function demonstrating the angular control of the scattering diagram. Inset: Averaged angular intensity distribution of the annular pattern in (a). Two minima are visible indicative of a lobe pattern.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: External control of the scattering properties of a single optical nanoantenna