Understanding multilayers from a geometrical viewpoint

Details Understanding multilayers from a geometrical viewpoint Understanding multilayers from a geometrical viewpoint

2001-04-17

arxiv.org/abs/physics/0104050v1

Physics

Optics

8 pages, 5 figures

Scientific paper

10.1364/JOSAA.19.000603

We reelaborate on the basic properties of lossless multilayers. We show that the transfer matrices for these multilayers have essentially the same algebraic properties as the Lorentz group SO(2,1) in a (2+1)-dimensional spacetime, as well as the group SL(2,R) underlying the structure of the ABCD law in geometrical optics. By resorting to the Iwasawa decomposition, we represent the action of any multilayer as the product of three matrices of simple interpretation. This group-theoretical structure allows us to introduce bilinear transformations in the complex plane. The concept of multilayer transfer function naturally emerges and its corresponding properties in the unit disc are studied. We show that the Iwasawa decomposition reflects at this geometrical level in three simple actions that can be considered the basic pieces for a deeper undestanding of the multilayer behavior. We use the method to analyze in detail a simple practical example.

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