Design of liquid crystal band-pass optical filter

2005 ◽  
Author(s):  
Andrzej Walczak ◽  
Piotr Marciniak
Keyword(s):  
Liquid Crystal ◽  
Optical Filter ◽  
Band Pass

A Switchable Optical Filter between Band-stop and Band-pass Responses

2020 ◽  
Author(s):  
Weijun Jiang ◽  
Lu Xu ◽  
Xiaolong Liu ◽  
Yu Yu ◽  
Yuan Yu ◽  
...  
Keyword(s):  
Optical Filter ◽  
Band Pass

scholarly journals Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 89
Author(s):  
Bowen Zhang ◽  
Nuo Chen ◽  
Xinda Lu ◽  
Yuhang Hu ◽  
Zihao Yang ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Tuning Range ◽  
Extinction Ratio ◽  
Optical Filter ◽  
Optimized Design ◽  
Coupling Coefficients ◽  
Large Bandwidth ◽  
Time Symmetry ◽  
Bandwidth Tuning ◽  
Band Pass

A chip-scale tunable optical filter is indispensable to meeting the demand for reconfigurability in wavelength division multiplexing systems, channel routing, and switching, etc. Here, we propose a new scheme of bandwidth tunable band-pass filters based on a parity-time (PT) symmetric coupled microresonator system. Large bandwidth tunability is realized on the basis of the tuning of the relative resonant frequency between coupled rings and by making use of the concept of the exception point (EP) in the PT symmetric systems. Theoretical investigations show that the bandwidth tuning range depends on the intrinsic loss of the microresonators, as well as on the loss contrast between the two cavities. Our proof-of-concept device confirms the tunability and shows a bandwidth tuning range from 21 GHz to 49 GHz, with an extinction ratio larger than 15 dB. The discrepancy between theory and experiment is due to the non-optimized design of the coupling coefficients, as well as to fabrication errors. Our design based on PT symmetry shows a distinct route towards the realization of tunable band-pass filters, providing new ways to explore non-Hermitian light manipulation in conventional integrated devices.

C-band three-port tunable band-pass thin film optical filter with low polarization-sensitivity

2008 ◽  
Vol 281 (14) ◽  
pp. 3709-3714 ◽  
Author(s):  
Kan Yu ◽  
Wen Liu ◽  
Dexiu Huang ◽  
Jing Chang
Keyword(s):  
Thin Film ◽  
Optical Filter ◽  
Polarization Sensitivity ◽  
Band Pass

Design and synthesis of a modified band-pass optical filter

2004 ◽  
Vol 97 (3) ◽  
pp. 446-454 ◽  
Author(s):  
K. D. Misra ◽  
R. K. Mishra
Keyword(s):  
Optical Filter ◽  
Design And Synthesis ◽  
Band Pass

scholarly journals Widely tunable chiral nematic liquid crystal optical filter with microsecond switching time

2014 ◽  
Vol 22 (16) ◽  
pp. 19098 ◽  
Author(s):  
Mohammad Mohammadimasoudi ◽  
Jeroen Beeckman ◽  
Jungsoon Shin ◽  
Keechang Lee ◽  
Kristiaan Neyts
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Switching Time ◽  
Optical Filter ◽  
Chiral Nematic

Electrically controlled terahertz band pass filter with liquid crystal

2008 ◽  
Author(s):  
Hui Li ◽  
Xinyu Zhang ◽  
Tianxu Zhang ◽  
Xubang Shen
Keyword(s):  
Liquid Crystal ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Terahertz Band ◽  
Band Pass

Electronically tunable narrow-band-pass optical filter for spectral imaging

1996 ◽  
Author(s):  
Duane E. Paulsen ◽  
Vladimir Pelekhaty ◽  
XiaoLu L. Wang
Keyword(s):  
Narrow Band ◽  
Optical Filter ◽  
Spectral Imaging ◽  
Band Pass ◽  
Electronically Tunable

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.

A Microwave Tunable Bandpass Filter for Liquid Crystal Applications

Frequenz ◽  
2017 ◽  
Vol 71 (7-8) ◽  
Author(s):  
Weiping Cao ◽  
Di Jiang ◽  
Yupeng Liu ◽  
Yuanwang Yang ◽  
Baichuan Gan
Keyword(s):  
Liquid Crystal ◽  
Bandpass Filter ◽  
Tunable Filter ◽  
Dielectric Anisotropy ◽  
Band Pass Filter ◽  
Microwave Band ◽  
Pass Filter ◽  
Practical Applications ◽  
Electro Optic ◽  
Band Pass

AbstractIn this paper, a novel microwave continuously tunable band-pass filter, based on nematic liquid crystals (LCs), is proposed. It uses liquid crystal (LC) as the electro-optic material to mainly realize frequency shift at microwave band by changing the dielectric anisotropy, when applying the bias voltage. According to simulation results, it achieves 840 MHz offset. Comparing to the existing tunable filter, it has many advantages, such as continuously tunable, miniaturization, low processing costs, low tuning voltage, etc. Thus, it has shown great potentials in frequency domain and practical applications in modern communication.

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