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An amplitude modulator for the terahertz (THz) range is designed. The Drude model is adopted, in which the collision damping is independent of the carrier energy. The Si block with 808 nm laser is illustrated, and it will generate the photocarriers. The injected photo-carriers will change the conductivity and dielectric of the sample, which have direct relationship with the absorption coefficient...
ZnSe multipod-based structures, including tetrapod-like microrods, long microwires, and short nanorods, are selectively prepared by atmospheric pressure thermal evaporation of ZnSe nanoparticles without using any catalyst. The morphologies could be well controlled by simply adjusting the deposition position. The phase structures, morphologies, and optical properties of the products are investigated...
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