In the paper we present method for three-dimensional measurement of birefringence distribution in anisotropic objects. The tool, which we used is combination of classic polariscopy with tomographic reconstruction method. Tomographic reconstruction is performed using the filtered backpojection algorithm. The results of measurement of
glass capillary infilled with licquid crystal are presented together with the results of numerical simulation of measurement process. Simulations include polarized light propagation performed by means of finite difference time domain method combined with Jones calculus. The numerical simulations are performed for various birefringence values and allow for determination of relative errors of birefringence distribution. Additionally the absolute refractive
indices are determined experimentally through the measurement of capillary with polarization sensitive microinterferometric tomography.
The paper reports numerical analysis of light propagation in a photonic crystal fiber filled with a nematic liquid crystal. Such fiber is not only an advanced anisotropic structure, but also can experience a change in its light propagation mechanism: from index guiding to the photonic band gap mechanism. Both of these mechanisms can be extensively tuned due to variations of liquid crystals and silica glass refractive indices differences. The obtained numerical simulations are confirmed by experimental results.
Microstructured optical fibers have ability to change their optical properties through inserting different materials into their holes. Filling the microstructured fibers with liquid crystals opens up a possibility of dynamic switching between different guiding mechanisms. In this paper we present the influence of electrical field on propagation properties of microstructured photonic crystal fibers filled with either low or highly birefringent nematic liquid crystals. Depending on the liquid crystal material introduced into the micro holes different propagation mechanism controlled by external electric field have been observed. This creates great potential in fiber optic sensing and optical processing application.
The paper presents our latest experimental results on influence of temperature on the propagation properties of photonic
liquid crystal fibers. We used solid-core photonic crystal fibers filled either with a low-birefringence prototype 1550
liquid crystal mixture or with PCB. It appeared that direction of temperature tuning in PLCFs is strongly dependent on
thermal characteristics of both refractive indices.
Spectral and polarization properties of microstructured photonic crystal fibers filled with nematic liquid crystals characterized by either extremely low (of the order ~ 0.05) or higher (of the order ~ 0.3) material birefringence have been investigated. The photonic crystal fiber used as a host material was manufactured in Lublin, Poland and the nematic liquid crystals were introduced into the micro holes of the photonic crystal fiber by the capillary effect. Due to anisotropic properties of the obtained microstructured photonic liquid-crystal fiber, switching between different guiding mechanisms as well as novel spectral and polarization phenomena have been observed.
The paper presents the latest experimental results on influence of temperature and external electrical fields on propagation properties of a photonic liquid-crystal fiber composed of a photonic crystal fiber infilled with a nematic liquid rystal characterized by either extremely low (of the order ~0.05) or relatively high (of the order ~0.3) material birefringence. The nematic liquid crystal was introduced into the micro holes of the photonic crystal fiber by the capillary effect. Due to anisotropic properties of the obtrained photonic liquid-crystal fiber, switching between different guiding mechanisms has also been demonstrated.
In this paper propagation properties in photonic crystal fibers (PCFs) filled with extremely low-birefringence nematic liquid crystal (LC) mixtures have been investigated. The low-birefringence nematic LC compositions included multicomponents esters mixtures and were characterized by extremely low ordinary no = 1.46-1.45 and extraordinary ne = 1.478-1.505 refractive indices at room temperature. Due to reorientation possibilities of nematic molecules within the fiber holes, propagation properties of the obtained photonic liquid crystal fibers could be easily modified.
The paper discusses influence of longitudinal strain on polarization mode dispersion in highly birefringence fibers. It appeared that polarization mode dispersion could be diminished owing to longitudinal strain. The compensating configuration based on dynamically induced longitudinal strain in the HB bow-tie fiber was proposed.
Polarization mode dispersion (PMD) is a major limitation in optical fiber transmission systems. The paper presents a new method of PMD compensation based on the use of highly birefringent (HB) bow-tie fibers. The method relies on the application of dynamically induced longitudinal strain that modifies differential group delay (DGD) responsible for effective PMD compensation.
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