Widely tunable optical filter with variable bandwidth based on spatially distributed cholesteric liquid crystal

2013 ◽  
Vol 52 (4) ◽  
pp. 044003 ◽  
Author(s):  
Yuhua Huang ◽  
Qing Sun ◽  
Shichao Zhang
Keyword(s):  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Optical Filter ◽  
Variable Bandwidth ◽  
Tunable Optical Filter ◽  
Spatially Distributed

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 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

scholarly journals Polarization-independent tunable optical filter with variable bandwidth based on silicon-on-insulator waveguides

Nanophotonics ◽  
2018 ◽  
Vol 7 (8) ◽  
pp. 1469-1477 ◽  
Author(s):  
Haoyan Wang ◽  
Jincheng Dai ◽  
Hao Jia ◽  
Sizhu Shao ◽  
Xin Fu ◽  
...  
Keyword(s):  
Free Spectral Range ◽  
Optical Filter ◽  
Second Order ◽  
Silicon On Insulator ◽  
Microring Resonators ◽  
Central Wavelength ◽  
Variable Bandwidth ◽  
Tunable Optical Filter ◽  
Two Stages ◽  
Polarization Independent

AbstractWe present a polarization-independent tunable optical filter with variable bandwidth based on silicon-on-insulator (SOI) waveguides. The polarization-independent operation is achieved through the use of a polarization splitter-rotator and a polarization rotator-combiner, which are based on a bilevel adiabatic taper and an asymmetric directional coupler. Two stages of second-order microring resonators (MRRs) with different radii are used to achieve wavelength filtering with variable bandwidth and large free spectral range (FSR). Each stage of the second-order MRRs has a flat-top spectrum. The central wavelength of the filter is tuned by synchronous tuning of the two stages. The 3 dB bandwidth is adjusted via intentional misalignment of the passbands of the two stages. We demonstrate a prototype of such an optical filter on the SOI platform. The FSR of the fabricated device is about 90 nm. We show the tuning of the central wavelength from 1460 to 1550 nm. We adjust the 3 dB bandwidth from 37.5 to 100 GHz with a step of 12.5 GHz, with the overall insertion loss varying from −5.4 to −7.9 dB.

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
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