scholarly journals Tunable Optical Beam Deflection Via Liquid Crystal Gradient Refractive Index Generated By Highly Resistive Polymer Film

2016 ◽  
Vol 8 (3) ◽  
pp. 1-11 ◽  
Author(s):  
Xiaobing Shang ◽  
Ailee Mae Trinidad ◽  
Pankaj Joshi ◽  
Jelle De Smet ◽  
Dieter Cuypers ◽  
...  
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Polymer Film ◽  
Optical Beam ◽  
Beam Deflection ◽  
Gradient Refractive Index

Electro-controllable optical beam deflection employing reflective liquid crystal spatial light modulator

2012 ◽  
Vol 24 (6) ◽  
pp. 1324-1328
Author(s):  
赵祥杰 Zhao Xiangjie ◽  
张大勇 Zhang Dayong ◽  
骆永全 Luo Yongquan
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Optical Beam ◽  
Beam Deflection ◽  
Light Modulator

Liquid crystal lenticular lens array with extended aperture by using gradient refractive index compensation

2020 ◽  
pp. 1-7
Author(s):  
Rui Li ◽  
Fan Chu ◽  
Li-Lan Tian ◽  
Xiao-Qing Gu ◽  
Xiang-Yu Zhou ◽  
...  
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Lens Array ◽  
Lenticular Lens ◽  
Gradient Refractive Index

scholarly journals Beam-Deflection Using Gradient Refractive-Index Media for 60-GHz End-Fire Antenna

2015 ◽  
Vol 63 (8) ◽  
pp. 3768-3774 ◽  
Author(s):  
Abdolmehdi Dadgarpour ◽  
Behnam Zarghooni ◽  
Bal S. Virdee ◽  
Tayeb A. Denidni
Keyword(s):  
Refractive Index ◽  
Beam Deflection ◽  
60 Ghz ◽  
Gradient Refractive Index

scholarly journals Shortcuts to Adiabaticity for Optical Beam Propagation in Nonlinear Gradient Refractive-Index Media

Entropy ◽  
2020 ◽  
Vol 22 (6) ◽  
pp. 673 ◽  
Author(s):  
Qian Kong ◽  
Huimin Ying ◽  
Xi Chen
Keyword(s):  
Refractive Index ◽  
Beam Propagation ◽  
Beam Width ◽  
Adiabatic Compression ◽  
Optical Beam ◽  
Variational Approximation ◽  
Adiabatic Process ◽  
Auxiliary Equation ◽  
Shortcuts To Adiabaticity ◽  
Gradient Refractive Index

In recent years, the concept of “shortcuts to adiabaticity" has been originally proposed to speed up sufficiently slow adiabatic process in various quantum systems without final excitation. Based on the analogy between classical optics and quantum mechanics, we present a study on fast non-adiabatic compression of optical beam propagation in nonlinear gradient refractive-index media by using shortcuts to adiabaticity. We first apply the variational approximation method in nonlinear optics to derive the auxiliary equation for connecting the beam width with the refractive index of the medium. Then, the gradient refractive index is inversely designed through the perfect compression of beam width with the appropriate boundary conditions. Finally, the comparison with conventional adiabatic compression is made, showing the advantage of our shortcuts.

Two-Dimensional Hybrid Photonic Crystal With Graded Low-Index Using a Nonuniform Voltage

2019 ◽  
Vol 75 (1) ◽  
pp. 65-71
Author(s):  
Behrooz Rezaei ◽  
Ibrahim Halil Giden ◽  
Mohammad Sadegh Zakerhamidi ◽  
Amid Ranjkesh ◽  
Tae-Hoon Yoon
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Photonic Crystal ◽  
Light Propagation ◽  
Near Field ◽  
Refractive Index Profile ◽  
Index Structure ◽  
Focal Distance ◽  
Graded Index ◽  
Gradient Refractive Index

AbstractWe proposed a new method for designing graded index lens using liquid crystal infiltration into annular photonic crystals. Applying an external nonuniform voltage in the transverse direction perpendicular to the direction of light propagation yields different orientation of liquid crystal molecules inside the photonic crystal unit cells. As a result, a gradient refractive index was modulated. We numerically investigate focusing properties of the designed graded index structure using plane-wave expansion and finite-difference time-domain methods. The gradient refractive index profile was adjusted by varying the nonuniform voltage excitations, which consequently altered the focal distance of the graded index structure. A wide tuning range of 1856 nm was achieved for focal distance by the proposed graded index structure. This feature can be implemented for planning a flat lens with tunable focal distance based on electro-optic effect. These achievements may have future applications in some optical devices such as near-field imaging and scanning.

scholarly journals Alignment Layer of Liquid Crystal Using Plant-Based Isoeugenol-Substituted Polystyrene

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 547
Author(s):  
DaEun Yang ◽  
Kyutae Seo ◽  
Hyo Kang
Keyword(s):  
Liquid Crystal ◽  
Surface Energy ◽  
Polymer Film ◽  
Uv Irradiation ◽  
Molar Content ◽  
Polymer Modification ◽  
Alignment Layer ◽  
Energy Value ◽  
Alignment System ◽  
Molar Percent

We synthesized a series of renewable and plant-based isoeugenol-substituted polystyrenes (PIEU#, # = 100, 80, 60, 40, and 20, where # is the molar percent content of isoeugenol moiety), using polymer modification reactions to study their liquid crystal (LC) alignment behavior. In general, the LC cells fabricated using polymer film with a higher molar content of isoeugenol side groups showed vertical LC alignment behavior. This alignment behavior was well related to the surface energy value of the polymer layer. For example, vertical alignments were observed when the polar surface energy value of the polymer was smaller than approximately 3.59 mJ/m2, generated by the nonpolar isoeugenol moiety with long and bulky carbon groups. Good alignment stability at 100 °C and under ultraviolet (UV) irradiation of 15 J/cm2 was observed for the LC cells fabricated using PIEU100 as a LC alignment layer. Therefore, renewable isoeugenol-based materials can be used to produce an eco-friendly vertical LC alignment system.

Gradient refractive-index optical rod prepared from methacrylate derivatives

1997 ◽  
Vol 22 (10) ◽  
pp. 668 ◽  
Author(s):  
Jui-Hsiang Liu ◽  
Hung-Tsai Liu
Keyword(s):  
Refractive Index ◽  
Gradient Refractive Index
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