Abstract
A theory of resonant absorption in disk with two-dimensional electron gas has been developed when the wavelength of external radiation is comparable with the radius of the disk. We have analyzed analytically and numerically the position and the linewidth of the resonant peak, which corresponds to excitation of the axisymmetric (quadrupole) plasma mode in the disk. We have found dependence of the plasma resonance characteristics on a dimensionless retardation parameter that is equal to the product of the plasma frequency and the radius of the disk divided by the speed of light. We have shown that the linewidth is not merely the sum of collisional and radiation decay, but also contains “interference” terms.
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