Abstract
The linewidth for an atom located near an ideally conducting tip or inside a conical cavity in an ideal conductor is analyzed. It is shown that the effect of the tip decreases as its opening angle decreases. At the same time, the linewidth for an atom in a conical cavity can strongly increase or strongly decrease, depending on the position of the atom and the opening angle of the cavity. The results obtained could be helpful in designing spectrally-selective near-field nanoscopes.
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Pis’ma Zh. Éksp. Teor. Fiz. 68, No. 8, 610–613 (25 October 1998)