Near-field optical microscopy has been used to study photorefractive surface waves in BaTiO<sub>3</sub>. The field distribution of the photorefractive surface wave near the crystal–air interface has been measured and compared with theory. Experimental data indicate that a micrometer-wide transition layer with dielectric and photorefractive properties that are different from the properties of the bulk BaTiO<sub>3</sub> exists near the interface.
© 1999 Optical Society of America
(180.5810) Microscopy : Scanning microscopy
(190.4350) Nonlinear optics : Nonlinear optics at surfaces
(190.5330) Nonlinear optics : Photorefractive optics
(240.6690) Optics at surfaces : Surface waves
Igor I. Smolyaninov and Christopher C. Davis, "Near-field optical study of photorefractive surface waves in BaTiO3," Opt. Lett. 24, 1367-1369 (1999)