Narrow bandwidth liquid crystal tunable filter based on Lyot-Solc composite structure

2018 ◽  
Author(s):  
Xiaoqian Yang ◽  
Qi Guo ◽  
Huijie Zhao ◽  
Tianhao Zhang ◽  
Kexin Yan ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Composite Structure ◽  
Tunable Filter ◽  
Narrow Bandwidth

scholarly journals Hyperspectral Fluorescence LIDAR Based on a Liquid Crystal Tunable Filter for Marine Environment Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 410
Author(s):  
Eleonora Aruffo ◽  
Andrea Chiuri ◽  
Federico Angelini ◽  
Florinda Artuso ◽  
Dario Cataldi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Marine Environment ◽  
Detection System ◽  
Tunable Filter ◽  
Spectral Interval ◽  
Environment Monitoring ◽  
Research Activities ◽  
Custom Made ◽  
New Instrument ◽  
Marine Environment Monitoring

An innovative hyperspectral LIDAR instrument has been developed for applications in marine environment monitoring research activities, remotely detecting the fluorescence spectra produced in the spectral interval between 400 nm and 720 nm. The detection system is composed by a custom made photomultiplier charge integrating and measuring (CIM) unit, which makes automatic background signal subtraction, and a liquid crystal tunable filter (LCTF). The new instrument therefore has hyperspectral resolution and allows automatic background subtraction; it is compact and automated by custom software that permit to adapt the instrument properties depending on the environmental conditions. Laboratory tests to characterize the instrument performance have been carried out, concluding that this sensor can be employed in remote sites for Chl-a detection.

scholarly journals A Technique for Tunable Filters with Low Insertion Loss and Narrow Bandwidth

2018 ◽  
Vol 38 ◽  
pp. 03039
Author(s):  
Chang Zhou ◽  
Chen Ji ◽  
Gen Ping Wu
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Tunable Filters ◽  
Tunable Filter ◽  
Center Frequency ◽  
Pin Diodes ◽  
Lc Filters ◽  
Narrow Bandwidth ◽  
Low Insertion Loss ◽  
Resonant Capacitor

A technique for tunable filters with low insertion loss and narrow bandwidth is proposed in the form of comb-line structure. Both resonant capacitor with pin-diodes and resonant inductance in the tunable filter were analyzed and the main source of insertion loss was obtained. A series of filters with same pin-diodes, center frequency, absolute bandwidth and low return loss was simulated. The results showed that, by changing the values of the resonant capacitor and inductance, insertion loss of the filter can be greatly restricted. This technique will allow the design of tunable LC filters with low insertion loss and narrow bandwidth.

Developing an optimum computer-designed multispectral system comprising a monochrome CCD camera and a liquid-crystal tunable filter

2008 ◽  
Vol 47 (24) ◽  
pp. 4381 ◽  
Author(s):  
Miguel A. López-Álvarez ◽  
Javier Hernández-Andrés ◽  
Javier Romero
Keyword(s):  
Liquid Crystal ◽  
Ccd Camera ◽  
Tunable Filter

High-speed liquid crystal fiber Fabry-Perot tunable filter

1996 ◽  
Vol 8 (9) ◽  
pp. 1190-1192 ◽  
Author(s):  
Yufei Bao ◽  
A. Sneh ◽  
K. Hsu ◽  
K.M. Johnson ◽  
Jian-Yu Liu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
High Speed ◽  
Tunable Filter ◽  
Crystal Fiber ◽  
Fabry Perot

Defect Engineering in 2D Photonic Crystals Fabricated by Electrochemical Etching of Silicon

2011 ◽  
Vol 178-179 ◽  
pp. 459-464 ◽  
Author(s):  
Ekaterina V. Astrova ◽  
Galya V. Fedulova ◽  
Yulia A. Zharova
Keyword(s):  
Liquid Crystal ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Composite Structure ◽  
Lattice Distortion ◽  
Electrochemical Etching ◽  
Defect Engineering ◽  
Substrate Side ◽  
Dead End ◽  
Side Walls

We propose electro-tunable composite structure of microcavity based on silicon 2D photonic crystal bar with a trench defect infiltrated with a liquid crystal. The device is fabricated by joint photo-electrochemical etching of deep macropores and trenches with subsequent trench opening from the substrate side. The optimized geometry and etching regime enables to minimize the lattice distortion introduced by trenches and to reduce roughness of the trench side walls. It was demonstrated that the structures with reach- through trenches and dead-end macropores are suitable for selective filling with a liquid crystal.

Evaluation of a high-throughput liquid crystal tunable filter for Raman chemical imaging of threat materials

2006 ◽  
Author(s):  
Xinghua Wang ◽  
Thomas C. Voigt ◽  
Philip J. Bos ◽  
Matthew P. Nelson ◽  
Patrick J. Treado
Keyword(s):  
Liquid Crystal ◽  
High Throughput ◽  
Chemical Imaging ◽  
Tunable Filter ◽  
Raman Chemical Imaging
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