Share Email Print

Proceedings Paper

Nonspecular effects and entropy change from complex media
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

The phenomena for which the laws of geometrical optics are invalid in the case of beams are already very well-known. Such effects are known as non-speculars and many works about them already exist in the literature. Classically, the angular and longitudinal displacements are considered the basic non-specular effects, but there are the focal and width changes that, in any sense, are related with the previous ones. The foundation of these non-specular effects are related with the energetic interchanges that take place at the inrerface between two media, and an entropic foundation has been developed recently. From the optical point of view, the non-specular effects have been studied because they are important for guided waves and integrated optics. An experimental verification is more simple in the microwaves region because the range in angular change has a small value (the order of magnitude is 10-3 radians), and the lateral displacement is comparable with the wavelength of the incident radiation. In this work, an impedance method (through the input impedance of the interface) is used to characterize different non-conventional structures: film on a medium with complex refraction index or multilayers with fractal distribution. The characterization of the reflection and transmission from the equivalent interface can be studied; also, very important is the relation between the angular and longitudinal changes with the entropy function for these cases.

Paper Details

Date Published: 30 June 2000
PDF: 10 pages
Proc. SPIE 4097, Complex Mediums, (30 June 2000); doi: 10.1117/12.390591
Show Author Affiliations
Mario Marcelo Lehman, Sofilab SACV and Univ. Nacional del Sur (Mexico)

Published in SPIE Proceedings Vol. 4097:
Complex Mediums
Akhlesh Lakhtakia; Werner S. Weiglhofer; Russell F. Messier, Editor(s)

© SPIE. Terms of Use
Back to Top