Development and characterization of an electrically tunable liquid-crystal Fabry–Pérot hyperspectral imaging device

2011 ◽  
Vol 5 (1) ◽  
pp. 053539 ◽  
Author(s):  
Kan Liu
Keyword(s):  
Liquid Crystal ◽  
Hyperspectral Imaging ◽  
Imaging Device ◽  
Fabry Perot

A tunable liquid crystal Fabry-Perot hyperspectral imaging device in mid-infrared wavelength range

2013 ◽  
Author(s):  
Anbang Fu ◽  
Huaidong Zhang ◽  
Xinyu Zhang ◽  
Hongshi Sang ◽  
Tianyu Zhang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Hyperspectral Imaging ◽  
Wavelength Range ◽  
Imaging Device ◽  
Mid Infrared ◽  
Infrared Wavelength ◽  
Fabry Perot

An electrically controlled liquid crystal Fabry-Perot hyperspectral imaging chip in mid-infrared region

2013 ◽  
Author(s):  
Anbang Fu ◽  
Huaidong Zhang ◽  
Xinyu Zhang ◽  
Hongshi Sang ◽  
Changsheng Xie
Keyword(s):  
Liquid Crystal ◽  
Hyperspectral Imaging ◽  
Infrared Region ◽  
Mid Infrared ◽  
Fabry Perot

Highly accurate spectral retardance characterization of a liquid crystal retarder including Fabry-Perot interference effects

2014 ◽  
Vol 115 (3) ◽  
pp. 033101 ◽  
Author(s):  
Asticio Vargas ◽  
María del Mar Sánchez-López ◽  
Pascuala García-Martínez ◽  
Julia Arias ◽  
Ignacio Moreno
Keyword(s):  
Liquid Crystal ◽  
Interference Effects ◽  
Fabry Perot

scholarly journals Azimuthal Anchoring Strength in Photopatterned Alignment of a Nematic

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 675
Author(s):  
H. Nilanthi Padmini ◽  
Mojtaba Rajabi ◽  
Sergij V. Shiyanovskii ◽  
Oleg D. Lavrentovich
Keyword(s):  
Liquid Crystal ◽  
Point Defects ◽  
Elastic Energy ◽  
Separation Distance ◽  
Thin Layers ◽  
Uv Exposure ◽  
Surface Anchoring ◽  
Anchoring Strength ◽  
Spatially Varying

Spatially-varying director fields have become an important part of research and development in liquid crystals. Characterization of the anchoring strength associated with a spatially-varying director is difficult, since the methods developed for a uniform alignment are seldom applicable. Here we characterize the strength of azimuthal surface anchoring produced by the photoalignment technique based on plasmonic metamsaks. The measurements used photopatterned arrays of topological point defects of strength +1 and −1 in thin layers of a nematic liquid crystal. The integer-strength defects split into pairs of half-integer defects with lower elastic energy. The separation distance between the split pair is limited by the azimuthal surface anchoring, which allows one to determine the strength of the latter. The strength of the azimuthal anchoring is proportional to the UV exposure time during the photoalignment of the azobenzene layer.

scholarly journals Mobile snapshot hyperspectral imaging device for skin evaluation using diffractive optical elements

2021 ◽  
Author(s):  
Christian Kern ◽  
Uwe Speck ◽  
Rainer Riesenberg ◽  
Carina Reble ◽  
Georg Khazaka ◽  
...  
Keyword(s):  
Hyperspectral Imaging ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
Imaging Device

scholarly journals Design of a Liquid-Crystal-Tunable Terahertz Demultiplexer Based on a Metal-Insulator-Metal Waveguide

2019 ◽  
Vol 9 (4) ◽  
pp. 644
Author(s):  
Xue-Shi Li ◽  
Naixing Feng ◽  
Yuan-Mei Xu ◽  
Liang-Lun Cheng ◽  
Qing Liu
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Metal Insulator ◽  
Resonance Modes ◽  
External Bias ◽  
Bias Electric Field ◽  
Metal Waveguide ◽  
Metal Insulator Metal ◽  
Fabry Perot ◽  
Mim Waveguide

A tunable demultiplexer with three output channels infiltrated by liquid crystal (LC) is presented, which is based on a metal-insulator-metal (MIM) waveguide. The operating frequencies of the three output channels can be tuned simultaneously at will by changing the external bias electric field applied to the LC. By analyzing the Fabry-Pérot (FP) resonance modes of the finite-length MIM waveguide both theoretically and numerically, the locations of the three channels are delicately determined to achieve the best demultiplexing effects. Terahertz (THz) signals input from the main channel can be demultiplexed by channels 1, 2 and 3 at 0.7135 THz, 1.068 THz and 1.429 THz, respectively. By applying an external electric field to alter the tilt angle of the infiltrating LC material, the operating frequencies of channels 1, 2 and 3 can be relatively shifted up to 12.3%, 9.6% and 9.7%, respectively. The designed demultiplexer can not only provide a flexible means to demultiplex signals but also tune operating bands of output channels at the same time.

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