We present the measurements of hemispherical elastic scattering of light guided by different modes of a planar LiNbO<sub>3</sub> waveguide. It is shown that the fundamental and the lowest-order modes are more sensitive to the scattering properties of the air-core interface, whereas higher-order modes are more sensitive to the optical inhomogeneities of the core-substrate interface. We also demonstrate that because of static polarization of LiNbO<sub>3</sub> crystal, the air-core interface is sensitive to the presence of dust particles in air, which causes a change in the scattered light based on time of observation. This sensitivity could be used to elaborate compact sensors of air contamination.
© 2002 Optical Society of America
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(120.6660) Instrumentation, measurement, and metrology : Surface measurements, roughness
(130.3730) Integrated optics : Lithium niobate
(240.6690) Optics at surfaces : Surface waves
(290.5880) Scattering : Scattering, rough surfaces
Valeriy A. Sterligov, Sergey I. Lysenko, Pierre Aschieri, Pascal Baldi, Loïc Chanvillard, and Marc De Micheli, "Elastic Light Scattering with a LiNbO3 Waveguide," Appl. Opt. 41, 1418-1423 (2002)