An arrayed infrared filter based on liquid crystal Fabry-Perot effect for electrically tunable spectral imaging detection

Jiuning Lin; Qing Tong; Jun Luo; Yu Lei; Xinyu Zhang; Hongshi Sang; Changsheng Xie

doi:10.1117/12.2204883

17 December 2015 An arrayed infrared filter based on liquid crystal Fabry-Perot effect for electrically tunable spectral imaging detection

Jiuning Lin, Qing Tong, Jun Luo, Yu Lei, Xinyu Zhang, Hongshi Sang, Changsheng Xie

Author Affiliations +

Proceedings Volume 9811, MIPPR 2015: Multispectral Image Acquisition, Processing, and Analysis; 981107 (2015) https://doi.org/10.1117/12.2204883
Event: Ninth International Symposium on Multispectral Image Processing and Pattern Recognition (MIPPR2015), 2015, Enshi, China

Abstract

An arrayed electrically tunable infrared (IR) filter based on the key structure of liquid crystal Fabry-Perot (LC-FP) working in the wavelength range from 2.5 to 12 μm, is designed and fabricated successfully. According to the electrically controlled birefringence characteristics of nematic LC molecules, the refractive index of LC materials filled into a prefabricated microcavity can be adjusted by the spatial electric field stimulated between the top aluminum electrode patterned by conventional UV-photolithography and the bottom aluminum electrode in the LC-FP. The particular functions including key spectral selection and spectral adjustment, can be performed by the developed LC-FP filter driven and controlled electrically. Our experiments show that the maximum transmittance of the transmission peaks is ~24% and the peaks of transmission spectrum shift through applying different voltage signals with a root mean square (RMS) value ranging from 0 to ~21.7Vrms. The experimental results are consistent with the simulation according to the model constructed by us. As a 4-channel array-type IR filter, the top electrode of the device is composed of four same sub-electrodes, which is powered, respectively, to select desired transmission spectrum. Each of the units in the device is operated separately and synchronously, which means that spectral images of the same object can be obtained with different wavelengths in one shot. Without any mechanical parts, the developed LC-FP filter exhibits several advantages including ultra-small size, low cost, high reliability, high spectral selectivity, and compact integration.

Citation Download Citation

Jiuning Lin, Qing Tong, Jun Luo, Yu Lei, Xinyu Zhang, Hongshi Sang, and Changsheng Xie "An arrayed infrared filter based on liquid crystal Fabry-Perot effect for electrically tunable spectral imaging detection", Proc. SPIE 9811, MIPPR 2015: Multispectral Image Acquisition, Processing, and Analysis, 981107 (17 December 2015); https://doi.org/10.1117/12.2204883

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Aluminum

Liquid crystals

Optical filters

Electrodes

Optical filtering

Transmittance

Fabry–Perot interferometers

Show All Keywords

Keywords/Phrases

Search In:

Publication Years