Structured surface reflector design for oblique incidence beam splitter at 610 GHz.
An iterative alternate projection-based algorithm is developed to design structured surface reflectors to operate as beam splitters at GHz and THz frequencies. To validate the method, a surface profile is determined to achieve a reflector at 610 GHz that generates four equal-intensity beams towards desired directions of ±12.6° with respect to the specular reflection axis. A prototype is fabricated and the beam splitter behavior is experimentally demonstrated. Measurements confirm a good agreement (within 1%) with computer simulations using Feko, validating the method. The beam splitter at 610 GHz has a measured efficiency of 78% under oblique incidence illumination that ensures a similar intensity between the four reflected beams (variation of about 1%).
F
F
Defrance
M
M
Casaletti
J
J
Sarrazin
M C
MC
Wiedner
H
H
Gibson
G
G
Gay
R
R
Lefèvre
Y
Y
Delorme