Nonspecular effects and entropy change from complex media

Mario Marcelo Lehman

doi:10.1117/12.390591

30 June 2000 Nonspecular effects and entropy change from complex media

Mario Marcelo Lehman

Proceedings Volume 4097, Complex Mediums; (2000) https://doi.org/10.1117/12.390591
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

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.

Citation Download Citation

Mario Marcelo Lehman "Nonspecular effects and entropy change from complex media", Proc. SPIE 4097, Complex Mediums, (30 June 2000); https://doi.org/10.1117/12.390591

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