Session CC - Condensed Matter I.
MIXED session, Friday morning, November 15
Henry Oliver E, Holiday Inn
With the experi\-mental observation of phase conjugated light foci of linear extensions well below the classical diffraction limit observed by Bozhevolnyi, Keller, and Smolyaninov[Opt. Lett. 19, 1601 (1994)], inclusion of near-field compo\-nents in the theoretical description of optical phase conjugation has received more attention[G. S. Agarwal and S. D. Gupta, Opt. Commun. 119, 591 (1995)].
Because of the small spatial range of the optical near-field from the source, a substantial part of the phase conjugation process related to the near-field components is bound to take place in the surface region of the nonlinear medium. Experimentally, the use of a thin film as the nonlinear medium has already drawn attention[P. Günter, in Notions and Perspectives of Nonlinear Optics, ed. O. Keller (World Scientific, Singapore, 1996)].
As a natural consequence we exam\-ine a 2-D system consisting of a thin film (quantum well) deposited on a sub\-strate, with the near-field probe placed in the vacuum outside the film, by use of Fourier analysis. To ensure that the description covers all components of the near-field that can actually be conjugated, we avoid usage of standard approximations such as the slowly varying enve\-lope approximation, the dipole approximation, the dielectric concept, near-normal incidence of the probe, and the requirement of strong pump fields.