THEORETICAL-MODEL FOR PHASE-CONJUGATION OF OPTICAL NEAR FIELDS

A macroscopic self-consistent model for external-reflection near-field microscopy together with a similar model for photon scanning tunnelin g microscopy is used to describe phase conjugation of light that is em itted by a fiber tip placed near a phase-conjugating mirror. The appro priate relations are obtained for a two-dimensional configuration, and numerical results for various trapezium-shaped fiber tips are present ed. This modeling accounts for the main features of recent experiments on phase conjugation of optical near fields and emphasizes the signif icance of taking into consideration field components that are evanesce nt in air but propagating in the phase-conjugating mirror. The influen ce of fiber tip parameters on the spatial confinement of phase-conjuga ted light is discussed. (C) 1995 Optical Society of America