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A new electron device with nanometer-thick multilayer heterostructure is proposed for amplification of an electromagnetic wave. The device is composed of the input part utilizing photon-assisted tunneling and the output part utilizing radiation from a charge density wave modulated at the input. A simple analysis shows that amplification up to the terahertz frequency range is possible in the device.
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Masahiro Asada (1996) studied this question.
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