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• W2018317197 abstract "We demonstrate active beam steering of terahertz radiation using a photo-excited thin layer of gallium arsenide. A constant gradient of phase discontinuity along the interface is introduced by an spatially inhomogeneous density of free charge carriers that are photo-generated in the GaAs with an optical pump. The optical pump has been spatially modulated to form the shape of a planar blazed grating. The phase gradient leads to an asymmetry between the +1 and -1 transmission diffracted orders of more than a factor two. Optimization of the grating structure can lead to an asymmetry of more than one order of magnitude. Similar to metasurfaces made of plasmonic antennas, the photo-generated grating is a planar structure that can achieve large beam steering efficiency. Moreover, the photo-generation of such structures provides a platform for active THz beam steering." @default.
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• W2018317197 date "2014-10-20" @default.
• W2018317197 modified "2023-10-02" @default.
• W2018317197 title "Active terahertz beam steering by photo-generated graded index gratings in thin semiconductor films" @default.
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• W2018317197 doi "https://doi.org/10.1364/oe.22.026559" @default.
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