A study of infrared dispersion filters

Vereshchagin, V. G.; Borisevich, N. A.

doi:10.1007/bf00604369

Cited by 1 publication

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References 7 publications

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“…An increase in particle size leads to a decrease in the intensity and narrowing of the transmission band for the same sample weight. All the indicated characteristic features are consistent with the behavior of the change in the transmission spectra in the Christiansen effect for a solid particles -liquid system [4]. For all changes in the cell filling conditions, the frequency of the transmission band maximum remains practically unchanged.…”

Section: Introductionsupporting

confidence: 74%

Christiansen effect in an Al2O3 particles – liquid crystal system

Ibragimov

2009

J Appl Spectrosc

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We have studied the optical transmission of a small aluminum oxide particles -liquid crystal (4-methoxybenzylidene-4′-butylaniline) system. We have observed that at room temperature, in the spectrum we observe a transmission band with maximum at 1896 cm -1 , which is shifted toward shorter wavelengths on application of a voltage and depends on temperature. The experimental results are explained by the optical homogeneity of the system in a narrow frequency interval when the refractive indices of the particle material and the matrix are close, and also by reorientation of the liquid crystal molecules when a voltage is applied.Introduction. We know that the optical properties of small particles depend on the medium in which they are found. In particular, for particle sizes comparable with the wavelength of incident light, under certain conditions the system transmits radiation only in a narrow wavelength range (the Christiansen effect). On the other hand, the optical and dielectric properties of a liquid crystal (LC) along the direction of propagation of light are easily changed by application of an electric field (the Frederick's effect).The basic condition for realization of the Christiansen effect is intersection of the dispersion curves for the refractive index of the matrix and the particle material at a sufficiently large angle. Another important condition for clear manifestation of this effect is transparency of the matrix in the corresponding region of the IR range. As the matrix, it is suggested to use the classic liquid crystal 4-methoxybenzylidene-4′-butylaniline (MBBA):

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Section: Introductionsupporting

confidence: 74%

Christiansen effect in an Al2O3 particles – liquid crystal system

Ibragimov

2009

J Appl Spectrosc

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A study of infrared dispersion filters

Cited by 1 publication

References 7 publications

Christiansen effect in an Al2O3 particles – liquid crystal system

Christiansen effect in an Al2O3 particles – liquid crystal system

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