Modified multicomponent band pass optical reflection filters at oblique incidence

作者：Misra KD^*; Mishra RK

来源：Optics and Spectroscopy, 2004, 97(4): 640-649.

DOI：10.1134/1.1813710

Reflection and transmission characteristics of a modified long-wavelength cutoff filter using a three-component system with an angular dependence are studied. In this case, a layer of high refractive index is sandwiched between edge layers of equivalent refractive index with the base structure [G(0.5 AB0.5A)](N); then, an optimized structure of the form [(0.5AB0.5A)(N-X) (0.5AB0.5A)X (0.5AB0.5A)(N-X)] is taken and its spectral properties are studied. In the case of a short-wavelength three-component cutoff filter, a layer of low refractive index is sandwiched between two edge layers of high equivalent refractive index with a base structure [G(0.5BA0.5D)](N) and its spectral characteristics are studied. Then, the structure is optimized [(0.5BA0.5B)(N-X)(0.5BA0.5B)(X)(0.5BA0.5B)(N-X)] and spectral characteristics of this structure are also studied. Spectral properties of band pass optical reflection filters of the type [G(XY)A] whose components are the proposed long-wavelength cutoff [(0.5AB0.5B)(N-X)(0.5AB0.5A)(X) (0.5BA0.5B)(N-)] and short-wavelength cutoff [(0.5BA0.5B)(N-X)(0.5BA0.5B)(X) (0.5BA0.5B)(N-X)] filter structures are studied with angular dependences. No increase in the bandwidth with the least oscillatory components at the edges can be precisely formed by known classes of a two-component system at normal incidence. It is shown that the use of reflection and transmission filters with oblique bands yields an ideal polarizer. Angular dependences of the filter and the transmission and reflection band shapes on the parameters of a high-reflectance multilayer coating, such as the thickness, refractive indices, and the number of layers, are analyzed in detail.

• 出版日期2004-10