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Metamaterial-based gradient index beam steerers for terahertz radiation
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Unit cell of the beam steerer. A 3 m slit was inscribed in a 200 nm thick copperplate. The copper was embedded in 60 m thick . (b) Retrieved effective refractive index and transmission versus frequency for different inner ring radii r. r was increased in 1 m steps from 18 m (black line) to 25 m (yellow-gray line, highest ). (c) Refractive index versus the inner ring radius r at the design frequency 1.3 THz (black square) as well as 1.2 THz (red circle) and 1.4 THz (blue triangle). Straight line shows fit with fixed slope of . (d) Excerpt of a microscope picture of the fabricated beam steerer. The ring radius increases along the x-axis from left to right.

Image of FIG. 2.
FIG. 2.

(a) Electric field of a 1.3 THz beam deflected from a double-layer beam steerer. The beam was deflected by –6.1°. (b) Spectral amplitude transmission of a single- and double-layer beam steerer for two different orthogonal polarizations in x- and y-direction.

Image of FIG. 3.
FIG. 3.

(a) Measured (symbols) and numerically calculated (lines) lateral THz field intensity distributions in dependence on the distance from a single-layer beam deflector at 1.3 THz for a y-polarized beam.  = 0 corresponds to the center position of the non-deflected reference beam. (b) Dependence of the beam center position on the distance from the beam steerer as derived from (a). Symbols correspond to measured data and lines to numerical data. The blue triangles and line correspond to deflection from a beam steerer that was rotated by 180° around the z-axis. Black squares and line indicate a reference measurement without beam deflector.

Image of FIG. 4.
FIG. 4.

Beam center position versus distance from a double-layer beam steerer for (a) y-polarization and (b) x-polarization.

Image of FIG. 5.
FIG. 5.

Measured and numerically calculated spectral dependence of the beam deflection angle for x- and y-polarized incident beams in the case of a (a) single-layer beam steerer and (b) double-layer beam steerer.


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Scitation: Metamaterial-based gradient index beam steerers for terahertz radiation