scholarly journals Multifunctional and reconfigurable graphene/liquid crystal-assisted asymmetrical Fabry-Pérot cavity for reflected light control

2021 ◽  
Author(s):  
Giovanni Magno ◽  
Marco Grande ◽  
Antonella D'Orazio
Keyword(s):  
Liquid Crystal ◽  
Light Control ◽  
Reflected Light ◽  
Fabry Perot

Electrically-Controllable Liquid Crystal Polarizing Filter for Eliminating Reflected Light

1998 ◽  
Vol 5 (2) ◽  
pp. 93-98 ◽  
Author(s):  
Hideo Fujikake ◽  
Kuniharu Takizawa ◽  
Tahito Aida ◽  
Hiroshi Kikuchi ◽  
Takanori Fujii ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Reflected Light

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.

MWIR/LWIR filter based on Liquid–Crystal Fabry–Perot structure for tunable spectral imaging detection

2015 ◽  
Vol 69 ◽  
pp. 68-73 ◽  
Author(s):  
Huaidong Zhang ◽  
Afzal Muhammad ◽  
Jun Luo ◽  
Qing Tong ◽  
Yu Lei ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Spectral Imaging ◽  
Fabry Perot ◽  
Imaging Detection

scholarly journals ELECTRICALLY TUNABLE FABRY-PEROT RESONATOR BASED ON MICROSTRUCTURED SI CONTAINING LIQUID CRYSTAL

2012 ◽  
Vol 122 ◽  
pp. 293-309 ◽  
Author(s):  
Vladimir A. Tolmachev ◽  
Vasily A. Melnikov ◽  
Аnna V. Baldycheva ◽  
Kevin Berwick ◽  
Tatiana S. Perova
Keyword(s):  
Liquid Crystal ◽  
Fabry Perot

scholarly journals Research on a Dual-Mode Infrared Liquid-Crystal Device for Simultaneous Electrically Adjusted Filtering and Zooming

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 137 ◽  
Author(s):  
Zhonglun Liu ◽  
Mingce Chen ◽  
Zhaowei Xin ◽  
Wanwan Dai ◽  
Xinjie Han ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Spectral Component ◽  
Dual Mode ◽  
Infrared Wavelength ◽  
Fabry Perot ◽  
Micro Holes ◽  
Micro Cavity ◽  
Micro Lens Array ◽  
20 Nm ◽  
Micro Lens

A new dual-mode liquid-crystal (LC) micro-device constructed by incorporating a Fabry–Perot (FP) cavity and an arrayed LC micro-lens for performing simultaneous electrically adjusted filtering and zooming in infrared wavelength range is presented in this paper. The main micro-structure is a micro-cavity consisting of two parallel zinc selenide (ZnSe) substrates that are pre-coated with ~20-nm aluminum (Al) layers which served as their high-reflection films and electrodes. In particular, the top electrode of the device is patterned by 44 × 38 circular micro-holes of 120 μm diameter, which also means a 44 × 38 micro-lens array. The micro-cavity with a typical depth of ~12 μm is fully filled by LC materials. The experimental results show that the spectral component with needed frequency or wavelength can be selected effectively from incident micro-beams, and both the transmission spectrum and the point spread function can be adjusted simultaneously by simply varying the root-mean-square value of the signal voltage applied, so as to demonstrate a closely correlated feature of filtering and zooming. In addition, the maximum transmittance is already up to ~20% according the peak-to-valley value of the spectral transmittance curves, which exhibits nearly twice the increment compared with that of the ordinary LC-FP filtering without micro-lenses.

scholarly journals Study of Utilization of Embedded Metal Nanoparticles in Dielectric Thin Film for Humidity Sensing

2019 ◽  
Vol 10 (2) ◽  
pp. 155-161
Author(s):  
Hala J. El-Khozondar ◽  
Waleed S. Mohammed
Keyword(s):  
Metal Nanoparticles ◽  
Theoretical Study ◽  
Dynamic Range ◽  
Volume Fraction ◽  
Dielectric Thin Film ◽  
Reflected Light ◽  
Metal Type ◽  
Reflection Peak ◽  
Fabry Perot ◽  
Film Interface

Abstract This paper presents a theoretical study of the utilization of the shift in the reflection peak of the thin dielectric film with embedded metal nanoparticles (NPs) towards humidity and vapor applications. The presence of the NPs in the film results in a complex effective index. Hence, the reflected light at the superstrate-film interface causes a phase shift when the index of the surrounding is changed. This alters the reflected spectrum of the formed Fabry-Perot, for both the reflection peak wavelength and intensity. Here, the dynamic range of the proposed sensor is optimized through the variation of the film thickness and nanoparticle metal type, as well as the volume fraction.

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