Methods and apparatus for terahertz wave amplitude modulation
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United States of America Patent
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Sep 16, 2014
Grant Date -
Dec 26, 2013
app pub date -
Jun 21, 2012
filing date -
Jun 21, 2012
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Abstract
A wave amplitude modulator for modulating a transmitted electromagnetic wave includes one or multiple self-gated capacitively coupled pair(s) of electron layers such as semiconductor or semimetal layers. Two electrical contacts are placed to each layer of electrons of the self-gated pair(s), and a power source is electrically connected to them. The power source, by varying the voltage applied between layers of electrons, tunes the electron density thereof, thereby adjusting the optical conductivity thereof, and the change in the optical conductivity of the layers of electrons causes an amplitude modulation of the transmitted electromagnetic wave passing through the capacitively coupled layers of electrons.
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