Abstract

We have created microscopic Fabry–Perot optical resonator cavities between the flattened end of a tunneling microscope tip and a semitransparent metal film. Power is transferred to cavity modes from a laser beam by means of surface-plasmon–polariton generation and subsequent radiative decay. We compare the dependence of the axial emission from these modes on cavity length and on the angle of incidence with the predictions of a stratified-medium model. The mode structure has a finesse that approaches the theoretical limit. At high incident power, second-harmonic radiation produced by weakly localized surface-plasmon–polaritons is also coupled into the cavity and detected in axial emission.

© 2000 Optical Society of America

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