Enhanced backscattering from a one-dimensional rough dielectric film on a glass substrate

Abstract

We have observed the enhanced backscattering of light from a characterized dielectric film deposited upon a glass substrate when the light illuminates the rough surface from the vacuum. The vacuum-dielectric interface is one dimensional, randomly rough, while the dielectric-glass interface is approximately planar. Numerical and experimental studies reveal that the main mechanism responsible for the enhanced backscattering is the constructive interference between two waves that follow reciprocal scattering paths through the dielectric film, which is also strengthened by the multiple scattering from the rough vacuum-dielectric interface.

Characterization of etched glass surfaces by wave scattering

“…21 The theory has been applied in one and two dimensions. Exact approaches have been applied successfully to dielectric, metallic or perfect conducting surfaces, 22,23 self-affine (fractal) surfaces, 24,25 dielectric films on a glass substrate 26 and dielectric films. 27,28 Such exact calculations have been compared with experimental results and approximate models.…”

“…Kirchhoff theory, also known as tangent plane or physical optics theory is the most widely used in the study of wave scattering from rough surfaces [21]. Kirchhoff theory has been applied to the study of One and two dimensional exact approaches have been successfully applied to dielectric, metallic or perfectly conducting surfaces [22,23] dielectric films on a glass substrate [24] and dielectric films [25,26]. Such exact calculations have been compared with experimental results and approximate models [24,27].…”

“…Kirchhoff theory has been applied to the study of One and two dimensional exact approaches have been successfully applied to dielectric, metallic or perfectly conducting surfaces [22,23] dielectric films on a glass substrate [24] and dielectric films [25,26]. Such exact calculations have been compared with experimental results and approximate models [24,27]. Also some authors studied wave scattering from random layers with rough interfaces [28,29].…”

Analytical expression for wave scattering from exponential height correlated rough surfaces

“…There are two types of problems in this area: (a) direct problem, (b) inverse problem. The direct problem is concerned with determining the scattered field from the knowledge of the incident field and the scattering obstacle [6,7,8,9,10,11]. Interesting works in the context of wave scattering has been carried out Brewster's scattering angle [12] and the Rayleigh hypothesis [13] have been studied.…”

Nonstandard refraction of light from one- and two-dimensional dielectric quasi-periodic surfaces

“…The dielectric quasi-periodic surface is illuminated from the photoresist side, and enters the sample from air through the glass plate. 6,7 The nonstandard refraction of light is measured around the antispecular direction for s−polarization; mainly it is due to local slopes at the dielectric-air interface.…”