Tunable optical filter based on nanocomposite (liquid crystal)/(porous silicon)

2012 ◽  
Author(s):  
Georgiy V. Tkachenko ◽  
Igor A. Sukhoivanov ◽  
Oleksiy V. Shulika ◽  
Volodymyr Tkachenko
Keyword(s):  
Liquid Crystal ◽  
Porous Silicon ◽  
Optical Filter ◽  
Tunable Optical Filter

Tunable Optical Filter with Variable Bandwidth Based on Cholesteric Liquid Crystal

2011 ◽  
Vol 181-182 ◽  
pp. 273-276
Author(s):  
Shi Chao Zhang ◽  
Yu Hua Huang
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Incident Light ◽  
Cholesteric Liquid Crystal ◽  
Optical Filter ◽  
Tunable Filter ◽  
Cholesteric Liquid Crystals ◽  
Central Wavelength ◽  
Variable Bandwidth ◽  
Tunable Optical Filter

An optical tunable filter with variable bandwidth has been demonstrated using two cholesteric liquid crystals. The incident light was first reflected by the first cholesteric liquid crystal and then by the second one. By rotating the two cholesteric liquid crystals simultaneously, the central wavelength can be tuned. By fixing one of the cholesteric liquid crystals and rotating the other one, the bandwidth of the tunable filter can be varied. The central wavelength of the tunable optical filter can be tuned from 513.4 nm to 576.8 nm and the bandwidth is varied from 10 nm to 80 nm. This property will allow it to be widely used in many fields, including optical communications and multispectral and hyperspectral imaging systems.

Tunable optical filter based on liquid crystal Fabry-Perot etalon

2004 ◽  
Author(s):  
Haixing Chen ◽  
Tengchao Huang ◽  
Weidong Shen ◽  
Haifeng Li ◽  
Peifu Gu
Keyword(s):  
Liquid Crystal ◽  
Optical Filter ◽  
Tunable Optical Filter ◽  
Fabry Perot

Tunable optical filter of porous silicon as key component for a MEMS spectrometer

2002 ◽  
Vol 11 (6) ◽  
pp. 815-828 ◽  
Author(s):  
G. Lammel ◽  
S. Schweizer ◽  
S. Schiesser ◽  
P. Renaud
Keyword(s):  
Porous Silicon ◽  
Optical Filter ◽  
Tunable Optical Filter

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.

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