Tunable optical filter based on one-dimensional periodic structure composed of SiO2 and anisotropic metamaterial (AMM) with a liquid crystal defect layer sandwiched by two SiO2

2019 ◽  
Vol 33 (18) ◽  
pp. 1950194 ◽  
Author(s):  
Pawan Singh ◽  
Khem B. Thapa ◽  
Narinder Kumar ◽  
Anil K. Yadav ◽  
Devesh Kumar
Keyword(s):  
Liquid Crystal ◽  
Periodic Structure ◽  
Incident Angle ◽  
Optical Filter ◽  
Defect Layer ◽  
Transmission Property ◽  
One Dimensional ◽  
Transmission Properties ◽  
Tunable Optical Filter ◽  
Anisotropic Metamaterial

This paper reports the tunable transmission properties of asymmetric one-dimensional periodic structure (1DPS) composed of SiO2 and anisotropic metamaterial (AMM) layers with defect of liquid crystal (LC) sandwiched by two SiO2 layers, i.e., (SiO[Formula: see text]AMM)[Formula: see text]SiO[Formula: see text]LC[Formula: see text]SiO[Formula: see text](SiO[Formula: see text]AMM)3 using the transfer matrix method (TMM). We have studied the optical properties of the periodic structure (SiO[Formula: see text]AMM)3 [Formula: see text]SiO[Formula: see text]LC[Formula: see text]SiO[Formula: see text](SiO[Formula: see text]AMM)3 with a different incident angle of the electromagnetic wave for particular director angle of LC molecules. The tunability of the transmission property of the considered 1DPS shows that the transmittance depends upon the orientation of LC molecules. Such an asymmetric periodic structure (1DPS) composed of SiO2 and AMM with a defect of LC sandwiched by two SiO2 layers, (SiO2 [Formula: see text]AMM)[Formula: see text]SiO[Formula: see text]LC[Formula: see text]SiO[Formula: see text](SiO[Formula: see text]AMM)3, may be used as a tunable optical filter and bi-stable device.

Electro-Tunable Defect Mode in One-Dimensional Periodic Structure Containing Nematic Liquid Crystal as a Defect Layer

2002 ◽  
Vol 41 (Part 2, No. 12B) ◽  
pp. L1482-L1484 ◽  
Author(s):  
Ryotaro Ozaki ◽  
Tatsunosuke Matsui ◽  
Masanori Ozaki ◽  
Katsumi Yoshino
Keyword(s):  
Liquid Crystal ◽  
Periodic Structure ◽  
Nematic Liquid Crystal ◽  
Defect Mode ◽  
Defect Layer ◽  
One Dimensional

Nonreciprocal and enhancement effect of one-dimensional magnetic photonic crystal with a gain defect

2019 ◽  
Vol 33 (06) ◽  
pp. 1950034
Author(s):  
Yi-Heng Wu ◽  
Yun-Tuan Fang
Keyword(s):  
Magnetic Field ◽  
Photonic Crystal ◽  
External Magnetic Field ◽  
Incident Angle ◽  
Gain Coefficient ◽  
Defect Layer ◽  
Gain Medium ◽  
Enhancement Effect ◽  
One Dimensional ◽  
Transmission Properties

The transmission properties of one-dimensional photonic crystal composed of the Gyromagnetic and gain medium are investigated. The energy loss due to the Gyromagnetic medium is compensated by adding one gain defect layer. From the analysis, it is found that both the nonreciprocal and enhancement effect are affected considerably by the incident angle, layer thickness, external magnetic field and gain coefficient. Specifically, it is demonstrated that the gain defect layer plays an important role in achieving nonreciprocal and enhancement transmission.

Tunable Sensing Property of 1D Periodic Structure with Defect of Liquid Crystal Sandwiched by Metallic Layers

2019 ◽  
Vol 17 (10) ◽  
pp. 800-803
Author(s):  
Pawan Singh ◽  
Krishan Pal ◽  
Narinder Kumar ◽  
Sudesh K. Singh ◽  
Khem B. Thapa ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electromagnetic Wave ◽  
Liquid Crystal ◽  
Periodic Structure ◽  
Transfer Matrix Method ◽  
Incident Angle ◽  
Dielectric Materials ◽  
Absorption Properties ◽  
One Dimensional ◽  
Absorption Defect

In this paper, we have investigated the optical properties of one-dimensional periodic structure of dielectric materials with defect of liquid crystal (LC) sandwiched with two silver (Ag) layers. The transmission, reflection and absorption properties of considered periodic structure have calculated theoretically using transfer matrix method (TMM). Our study reports that the tunability of absorption defect peak of the defect periodic structure is achieved by the variation in the incident angle of electromagnetic wave. The obtained result suggests that such defect periodic structure may be used as tunable sensor and filter devices.

scholarly journals Optical Filter with Large Angular Dependence of Transmittance Using Liquid Crystal Devices

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1199
Author(s):  
Kohki Takatoh ◽  
Masahiro Ito ◽  
Suguru Saito ◽  
Yuuta Takagi
Keyword(s):  
Liquid Crystal ◽  
Incident Angle ◽  
Optical Filter ◽  
Half Wave Plate ◽  
S Waves ◽  
Wave Plate ◽  
Liquid Crystal Devices ◽  
Half Wave ◽  
Wide Range ◽  
Pretilt Angles

This study proposed a new type of optical device with variable transmittance based on the incident angle direction. These devices consist of two liquid crystal devices (LCDs) with a half-wave plate between them. Hybrid aligned nematic (HAN)-type guest-host (GH) LCDs or GH-LCDs with antiparallel alignment of high pretilt angles were used. The use of a half-wave plate allowed for the control of the p- and s-waves. Using these devices, a wide range of transmittances were obtained because no polarizer was used. The newly proposed LCDs have a wide range of applications, including use on buildings, vehicles, and glasses.

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