Electronically tunable Fabry-Perot interferometers with double liquid crystal layers

2002 ◽  
Author(s):  
Kuen-Cherng Lin ◽  
Kun-Yi Lee ◽  
Cheng-Chih Lai ◽  
Chin-Yu Chang ◽  
Sheng-Hsien Wong
Keyword(s):  
Liquid Crystal ◽  
Fabry Perot ◽  
Electronically Tunable

Raman Imaging Using a Tunable Dual-Stage Liquid Crystal Fabry-Perot Interferometer

1995 ◽  
Vol 49 (8) ◽  
pp. 1120-1125 ◽  
Author(s):  
Kenneth A. Christensen ◽  
Nancy L. Bradley ◽  
Michael D. Morris ◽  
Robert V. Morrison
Keyword(s):  
Liquid Crystal ◽  
Background Subtraction ◽  
Nearest Neighbors ◽  
Raman Imaging ◽  
Fabry Perot ◽  
Raman Modes ◽  
Dual Stage ◽  
Imaging Mode ◽  
Electronically Tunable ◽  
Imaging Performance

A 11 12 cm−1 bandpass electronically tunable liquid crystal dual-stage Fabry-Perot filter (DFPF) has been developed for use in Raman and fluorescence microscopic imaging. The imaging performance of the filter was demonstrated in the fluorescence and Raman modes. In the fluorescence mode, the filter was shown to give sharpened images using the nearest-neighbors deblurring algorithm. In the Raman imaging mode, background subtraction was shown to be useful for removal of the fluorescence from Raman images. With the use of a 100 × /1.25 objective, no significant decrease in the spatial resolution of the microscope was observed when the DFPF was inserted in the optical system.

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.

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