Using degenerate four-wave mixing in an Fe:LiNbO3 0.04-wt. % crystal and an external-reflection near-field optical microscope, we have achieved phase conjugation of light emitted by a fiber tip. We observe that the phase-conjugated light at a wavelength of 633 nm can reach a power of ~0.1 nW and produce a 180-nm-wide spot image in the near-field microscope. This is the first direct demonstration, to our knowledge, of the phase conjugation of near-field components of optical fields.
© 1994 Optical Society of America
Original Manuscript: May 31, 1994
Published: October 15, 1994
Sergey I. Bozhevolnyi, Ole Keller, and Igor I. Smolyaninov, "Phase conjugation of an optical near field," Opt. Lett. 19, 1601-1603 (1994)