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Total funneling of light in high aspect ratio plasmonic nanoresonators
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) The fabrication steps of high aspect ratio metallic groove grating is shown from (i) to (iii). The first step consists in obtaining a semiconductor mold of the wished structure thanks to an e-beam lithography step and a dry etching. Gold electroplating is then done to obtain the complementary of the mold and in the last step, the mold is removed. (b) Angled SEM image of the GaAs mold after an ICP-RIE process. The grating of GaAs walls obtained has a 2500nm period, and walls are 2000 nm high and 150 nm wide. (c) Top SEM image of the metallic grooves. Some defects have been transferred from the mold to the grating surface.

Image of FIG. 2.
FIG. 2.

(a) Reflectivity of a TM-polarized plane wave impinging on the gold grating at an incidence of 5° measured (solid lines) and computed for a grating of metallic rectangular grooves (, , and ) with and without 200 nm of GaAs at the bottom of each groove (dashed lines). [(b) and (c)] Streamlines of the total Poynting vector are plotted above the grating. For the sake of clarity, the streamlines are not plotted inside the grooves. In the metal, map of the energy dissipation is computed. The incident energy is funneled inside the groove where it is fully absorbed on the metallic sidewalls.

Image of FIG. 3.
FIG. 3.

Measured reflectivity diagram plotted on a gray scale, for incident angles between 5° and 50°. The resonance wavelength and reflectivity values are independent of for both resonances. In the inset, the computed (solid line) and measured (dots) values of the absorption as a function of angle at the resonance wavelength .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Total funneling of light in high aspect ratio plasmonic nanoresonators