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(a) Photograph of the developed structure. A series of the holes are filled to form a chirped grating pattern. (b) Definition of the dimensions. The waveguide is defined by rectangular shaped holes of 0.12 mm deep aligned in 0.16 mm period. (c) Simulation with no holes filled. (d) Simulation with one hole filled.
Experimental setup. The receiver moves in xyz to map the field above the waveguide. The fields are kept in TM-polarization throughout the measurement (the magnetic field has only y-components).
Frequency-dependent trace of the focus. Solid curve represents a theoretical curve while circles and triangles express the measurement (from 232 GHz to 302 GHz at about 3 GHz intervals) and simulation (230 GHz to 300 GHz at about 5 GHz intervals), respectively.
Focused radiation observed at 270 GHz (power distribution). (a)Simulation and (b) measurement. The measured area is indicated by the dashed squares.
Line-shaped focus observed at 270 GHz in parallel to the focal plane (power distribution). (a) Simulation (z = 24.8 mm) and (b) measurement (z = 28 mm). The color bar is the same as in Fig. 4.
Profiles of the focus at (a) 243 GHz, (b) 270 GHz, and (c) 290 GHz, respectively. The z-position of the profiles differs between the simulation and measurement as indicated in Fig. 3.
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