Structured surface reflector design for oblique incidence beam splitter at 610 GHz

Abstract : 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%).
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Optics Express, Optical Society of America, 2016, 24 (18), pp.20335 - 20345. 〈10.1364/OE.24.020335〉
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Fabien Defrance, Massimiliano Casaletti, Julien Sarrazin, Martina Wiedner, Hugh Gibson, et al.. Structured surface reflector design for oblique incidence beam splitter at 610 GHz. Optics Express, Optical Society of America, 2016, 24 (18), pp.20335 - 20345. 〈10.1364/OE.24.020335〉. 〈hal-01360075〉

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