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Spectra of phonons with out-of-plane polarization were studied experimentallyin a 2D plasma crystal. The dispersion relation was directly measured for thefirst time using a novel method of particle imaging. The out-of-plane mode wasproven to have negative optical dispersion, comparison with theory showed goodagreement. The effect of the plasma wakes on the dispersion relation is brieflydiscussed.

First direct measurement of optical phonons in 2D plasma crystals