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0Diffraction of light on multiplexed multilayer holographic diffraction structures with varying periods
D.S. Rastrygin1*, V.O. Dolgirev1, S.N. Sharangovich1
1- Tomsk State University of Control System and Radioelectronics, Lenin avenue 40,
634050 Tomsk, Russia
* gg9dragon9gg@gmail.ru
The application of diffraction optics in modern science and technology is relevant and significant. This branch of optics provides the opportunity to design and study optical elements that operate on the basis of diffraction phenomena, which has a wide range of potential applications [1,2].
This paper presents an analytical model of light diffraction by multiplexed multilayer period-varying holographic diffraction structures formed in photopolymer composite materials. As a result of numerical calculation, the influence of a varying period on the diffraction characteristics of such structures was demonstrated. The scheme of light diffraction on these structures is shown in Fig. 1. As a result, an increase in the angular selectivity width by several times is observed relative to the standard multiplexed multilayer structure. The numerical calculation results are presented in Fig. 2. This type of angular selectivity is set of local maxima and minima, number and the width of which depends on the stability parameters, including the number of diffraction layers and relation to their thickness. By such local maxi as stripes transmittance for specific wavelengths when deflected from Bragg diffraction regime, renders these structures suitable for application in optical devices designed for spectral filtering purposes [2].
The results obtained make it possible to use multiplexed multilayer holographic diffraction structures with varying periods as the main element for optical spectral filters for communication networks.
x
I i
I I
| Diffraction layer |
i i
i i i
|***| Diffraction layer |
Fig. 1. Schematic of light diffraction on chirped multiplexed MIHDS with varying periods.
80 70 60
■vO 50 - 40 - 30 20 10
-40
0,degree
-41 -27 -13 C 13 27 41 55
-Standart MlilDS
-Multiplexed MIHDS
1 - Multiplexed chirped MIHDS with
0,5VV"'=3-10!
liÎU -
-30
-20
-10
0
A K
10
20
30
40
Fig. 2. Angular selectivity of standard and multiplexed chirped dual-layer HDS.
[1] R. Malallah, et al, Improving the uniformity of holographic recording using multilayer photopolymer. Part I. Theoretical analysis, J. Opt. Soc., vol. 36 (3), pp. 320-333, 2019.
[2] V.O. Dolgirev, S.N. Sharangovich, Study of light diffraction on electrically controlled multilayer inhomogeneous structures with smooth optical inhomogeneity based on photopolymerizing compositions with nematic liquid crystals, Bull. Russ. Acad. Sci. Phys., vol. 86(1), pp. S46-S49, 2022.
