The quantum theory of the absorption of weak electromagnetic waves (EMWs) caused by confined
electrons in quantum wires has been studied based on Kubo's linear response theory and Mori's projection
operator method. Analytical expressions for the absorption coefficients of weak EMWs in quantum wires
with electron-acoustic phonon and electron-optical phonon scattering mechanisms are obtained. The
dependence of the absorption coefficient of a weak EMW on its frequency ?? as system temperature T, and
the parameters charactering the sample are analyzed. Numerical calculations have been done, and the results
are discussed for a typical wire of GaAs/GaAsAl
