Optical properties of selected photonic microstructures based on BP LCs doped with gold nanoparticles (Au NPs) are discussed. It has been shown that the examined photonic microstructures can provide promising tunable optical properties, simultaneously enhancing temperature stability of liquid crystalline microstructures. This is due to the presence of Au NPs with an appropriate organic coating in the LC matrix. It has been demonstrated that the investigated BP LC-based photonic microstructures seem to be very promising materials for realizing electro-optical modulation and switching as well tunable filter applications and sensing capabilities providing better transmission properties for perspective emerging tunable photonic devices.
Tapering technique is one of the most useful in the telecommunications as well as in sensing which offers up to now the best quality fused optical fiber elements such as couplers, splitters and combiners. It allows to fabricate various types of the tapers used as platforms of optical fiber transducers for chemical or biological sensors, as well. In the paper polarization properties of an optical biconical taper with liquid crystal cladding are presented. The optical fiber taper manufactured by mentioned above technique was sandwiched between parallel glass plates with ITO and alignment layers to form a tested optical element. Standard nematic liquid crystals E7 and 6CHBT were applied as claddings of the tapered fiber. Sufficient transmission losses of infrared radiation were observed when orientation layers of glass plates were perpendicular to the tapered fiber. The main contribution of this paper is calculation the polarization properties of the tested samples by the Lu-Chipman decomposition method based on measured Mueller matrices. Analysis of measurements show that the applied voltages have the strongest influence on transmission losses and dichroism. These effects will be carefully investigated towards the voltage sensor and emulators of polarization depended loss.
The paper presents the results of manufacturing and characterization of a broad band in-line hybrid device using a nematic liquid crystal as an active cladding for biconical tapered optical fiber. Two different liquid crystal mixtures denoted as 1550* and E7 were used for electric and temperature control in a broad wavelength range. An optical fiber tapers with a waist of 10±0.5 μm and losses lower than 0.5 dB in a whole broad band spectrum range were applied. Such taper waist diameter makes the whole waist as core for light propagation, where the surrounding air becomes the cladding. Additionally, such diameter enables an effective control of molecules orientation. Performance of a tuned cladding was studied in an electric field in the range between 0 V and 160 V in the room temperature equal to 20 °C. Influence of induced liquid crystal molecules reorientation was measured at a broad wavelength range (500-1700 nm).
The paper presents the results of design, manufacturing and characterization of an hybrid broad band in-line device using a nematic liquid crystal as an active medium which influences light propagating in a biconical optical fibre taper. A liquid crystal mixture denoted 6CHBT*and E7 is designed for electric, as well as temperature control of electromagnetic wave propagation in a broad wavelength range. The main reason of using the taper structure with a waist of 10± 0.5 μm and losses lower than 0.5 dB is possibility of using a liquid crystalline medium as cladding. Such approach enables effective control of its refractive index. Two kinds of initial liquid crustal molecules’ orientation (parallel and orthogonal) in relation to the light beam propagating in a taper were applied. Performance of a tuned cladding was studied at electric field of the range of 0V – 160V in the room temperature equal to 20°C. Influence of induced reorientation of liquid crystal molecules was measured at a broad wavelength range [500-1700 nm].
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