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(a) Photocurrent through the metal-LT-GaAs-metal device for various relative phases between the and frequency components. The amplitude of the sinusoidal fit (solid line) reveals the magnitude of the coherently controlled photocurrent. (b) SEM image of a gold nanoantenna defined at the center of a 15 μm wide LT-GaAs bar. (c) Schematic of the sample and the measurement circuit (not to scale).
(a) Map of the coherently controlled photocurrent around an antenna position. (b) Profile of along the dashed line indicated in the 2D-scan in (a). (c) as a function of the excitation power at the antenna position (red triangles) and between the antennas (black circles).
Comparison of antenna devices of different lengths: (a) SEM image. (b) Reflectivity map of the device, taken with illumination. The slight increase of reflectivity reveals the positions of the antennas. (c) Two-dimensional map of the coherently controlled photocurrent . (d) Line profile of the through the various antenna devices as indicated by the dashed line in (c). The current is significantly enhanced at the antenna positions.
Electric field distribution on the sample surface in the near field of 640 nm long bow tie antennas obtained from FTDT simulations. The polarization of the excitation is (a) parallel and (b) perpendicular to the antenna axis. The color scale corresponds to maximum (red) and minimum (blue) electric field and is equal for both images.
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