scholarly journals Observation of out-coupling of a nematicon

2006 ◽  
Vol 14 (4) ◽  
Author(s):  
J. Beeckman ◽  
K. Neyts ◽  
X. Hutsebaut ◽  
M. Haelterman
Keyword(s):  
Liquid Crystal ◽  
Diffraction Pattern ◽  
Light Propagation ◽  
Optical Solitons ◽  
Important Observation ◽  
Scattering Measurements ◽  
Spatial Optical Solitons ◽  
Crystal Cells ◽  
Good Agreement

AbstractIn this work we present the observation of spatial optical solitons in liquid crystal cells by recording the diffraction pattern of the out-coupled beam on a distant screen. Simultaneously, the light propagation is observed via scattering measurements. The most important observation is displacement of the beam on the screen due to the transverse undulation inside the cell. This undulation is caused by the anisotropic walk-off of the beam. The displacement is in good agreement with the values of the undulation earlier reported.

Tunable properties of light propagation in photonic liquid crystal fibers

2006 ◽  
Vol 14 (4) ◽  
Author(s):  
K. Szaniawska ◽  
T. Nasilowski ◽  
T. Woliński ◽  
H. Thienpont
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Light Propagation ◽  
Solid Core ◽  
Simulation Methods ◽  
Pure Silica ◽  
Tunable Properties ◽  
Crystal Fibers ◽  
Propagation Properties ◽  
Good Agreement

AbstractTunable properties of light propagation in photonic crystal fibers filled with liquid crystals, called photonic liquid crystal fibers (PLCFs) are presented. The propagation properties of PLCFs strongly depend on contrast between refractive indices of the solid core (pure silica glass) and liquid crystals (LCs) filing the holes of the fiber. Due to relatively strong thermo-optical effect, we can change the refractive index of the LC by changing its temperature. Numerical analysis of light propagation in PLCF, based on two simulation methods, such as finite difference (FD) and multipole method (MM) is presented. The numerical results obtained are in good agreement with our earlier experimental results presented elsewhere [1].

scholarly journals Enhancement of the SPR Effect in an Optical Fiber Device Utilizing a Thin Ag Layer and a 3092A Liquid Crystal Mixture

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7553
Author(s):  
Joanna Korec ◽  
Karol A. Stasiewicz ◽  
Katarzyna Garbat ◽  
Leszek R. Jaroszewicz
Keyword(s):  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Liquid Crystal ◽  
Optical Fiber ◽  
Surface Plasmon ◽  
Light Propagation ◽  
Resonance Effect ◽  
Surface Plasmon Resonance Effect ◽  
Tapered Optical Fiber ◽  
Crystal Cells

This paper is a continuation of previous work and shows the enhancement of the surface plasmon resonance effect in a tapered optical fiber device. The study investigated liquid crystal cells containing a tapered optical fiber covered with a silver nanolayer, surrounded by a low refractive index liquid crystal in terms of the properties of light propagation in the taper structure. Silver films with a thickness of d = 10 nm were deposited on the tapered waist area. Measurements were performed at room temperature; liquid crystal steering voltage U from 0 to 200 V, with and without any amplitude modulation with a frequency of f = 5 Hz, and the wavelength λ ranged from 550 to 1200 nm. A significant influence of the initial arrangement of liquid crystals molecules on light propagation was observed. Three types of liquid crystal cells—orthogonal, parallel, and twist—were considered. During the measurements, resonant peaks were obtained—the position of which can also be controlled by the type of liquid crystal cells and the steering voltage. Based on the obtained results, the best parameters, such as highest peak’s width reduction, and the highest SNR value were received for twisted cells. In addition, the present work was compared with the previous work and showed the possibility of improving properties of the manufactured probes, and consequently, the surface plasmon resonance effect. In the presented paper, the novelty is mainly focused on the used materials as well as suitable changes in applied technological parameters. In contrast to gold, silver is characterized by different optic and dielectric properties, e.g., refractive index, extension coefficient, and permittivity, which results in changes in the light propagation and the SPR wavelengths.

scholarly journals Controllable shifting, steering, and expanding of light beam based on multi-layer liquid-crystal cells

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Urban Mur ◽  
Miha Ravnik ◽  
David Seč
Keyword(s):  
Liquid Crystal ◽  
Light Beam ◽  
Optical Tweezers ◽  
Light Propagation ◽  
Control Device ◽  
Beam Control ◽  
Precise Control ◽  
Vision Correction ◽  
Light Beams ◽  
Crystal Cells

AbstractShaping and steering of light beams is essential in many modern applications, ranging from optical tweezers, camera lenses, vision correction to 3D displays. However, current realisations require increasingly greater tunability and aim for lesser specificity for use in diverse applications. Here, we demonstrate tunable light beam control based on multi-layer liquid-crystal cells and external electric field, capable of extended beam shifting, steering, and expanding, using a combination of theory and full numerical modelling, both for liquid crystal orientations and the transmitted light. Specifically, by exploiting three different function-specific and tunable birefringent nematic layers, we show an effective liquid-crystal beam control device, capable of precise control of outgoing light propagation, with possible application in projectors or automotive headlamps.

Peculiarities of light propagation in chiral liquid crystal cells in an external electric field

2014 ◽  
Vol 118 (2) ◽  
pp. 323-332 ◽  
Author(s):  
E. V. Aksenova ◽  
B. B. Divinskii ◽  
A. A. Karetnikov ◽  
N. A. Karetnikov ◽  
A. P. Kovshik ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
External Electric Field ◽  
Light Propagation ◽  
Chiral Liquid Crystal ◽  
Crystal Cells

Studies of Transmission Properties of Guest-Host Black Liquid Crystal Device

2010 ◽  
Vol 428-429 ◽  
pp. 593-596
Author(s):  
Xiao Xi Chen ◽  
Zi Qiang Huang ◽  
Wen Jun Yang ◽  
Jin Bi Leng
Keyword(s):  
Liquid Crystal ◽  
Calculated Data ◽  
Liquid Crystal Cell ◽  
Experimental Result ◽  
Liquid Crystal Device ◽  
Transmission Properties ◽  
Basic Characteristics ◽  
Crystal Cells ◽  
Electronic Field ◽  
Good Agreement

This research is to develop a black-white liquid crystal adjustable grating using the period distributed electronic field pulsing on guest-host liquid crystal. The transmission properties of parallel or twisted-alignment liquid crystal cells have been investigated by means of numerical simulating and experiencing the guest-host liquid crystal cells, and analyze how the parameters of the LC cell effects such basic characteristics of LCDs as the contrast, brightness and polarity of the viewing angles. The result is the alignment impact on the transmittance of the liquid crystal cell. A good agreement between the experimental result and the calculated data was achieved.

Simulation of 2-D lateral light propagation in nematic-liquid-crystal cells with tilted molecules and nonlinear reorientational effect

2005 ◽  
Vol 37 (1-3) ◽  
pp. 95-106 ◽  
Author(s):  
Jeroen Beeckman ◽  
Kristiaan Neyts ◽  
Xavier Hutsebaut ◽  
Cyril Cambournac ◽  
Marc Haelterman
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Light Propagation ◽  
Crystal Cells

scholarly journals Passively Tunable Terahertz Filters Using Liquid Crystal Cells Coated with Metamaterials

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 381
Author(s):  
Wei-Fan Chiang ◽  
Yu-Yun Lu ◽  
Yin-Pei Chen ◽  
Xin-Yu Lin ◽  
Tsong-Shin Lim ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Ring Resonators ◽  
Maximum Frequency ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Terahertz Region ◽  
Resonance Frequencies ◽  
Terahertz Communication ◽  
Terahertz Sensing ◽  
Crystal Cells

Liquid crystal (LC) cells that are coated with metamaterials are fabricated in this work. The LC directors in the cells are aligned by rubbed polyimide layers, and make angles θ of 0°, 45°, and 90° with respect to the gaps of the split-ring resonators (SRRs) of the metamaterials. Experimental results display that the resonance frequencies of the metamaterials in these cells increase with an increase in θ, and the cells have a maximum frequency shifting region of 18 GHz. Simulated results reveal that the increase in the resonance frequencies arises from the birefringence of the LC, and the LC has a birefringence of 0.15 in the terahertz region. The resonance frequencies of the metamaterials are shifted by the rubbing directions of the polyimide layers, so the LC cells coated with the metamaterials are passively tunable terahertz filters. The passively tunable terahertz filters exhibit promising applications on terahertz communication, terahertz sensing, and terahertz imaging.

Sign in / Sign up

Export Citation Format

Share Document