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Antidot structures have been prepared by etching arrays of 100-nm holes into a two-dimensional electron gas of GaₗIn₁-ₗAs quantum wells. In the far-infrared response we observe the unique collective excitation spectrum of antidots. It consists of a high-frequency branch which starts, in a magnetic field B, with a negative B dispersion and then increases in frequency with B. A second low-frequency branch corresponds at high B to edge magnetoplasmons which circulate around the holes. For small B this branch approaches the cyclotron frequency, where the electrons perform classical cyclotron orbits around the holes.
Kern et al. (Mon,) studied this question.