Open AccessElectronically controlled wavelength‐tunable transmission filter based on metal grating incorporating polymer‐dispersed liquid crystal
Author(s) -
Wang Qi,
Tang Qingyong,
Dai Bo,
Wang Zhongfei,
Huang Yuanshen,
Ni Zhengji,
Zhang Dawei
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.3387
Subject(s) - materials science , wavelength , refractive index , grating , liquid crystal tunable filter , optoelectronics , optics , optical filter , bandwidth (computing) , liquid crystal , transmission (telecommunications) , diffraction grating , filter (signal processing) , voltage , telecommunications , physics , computer science , quantum mechanics , computer vision
A novel narrow‐band tunable transmission filter based on a sub‐wavelength metallic grating incorporating polymer‐dispersed liquid crystal (PDLC) with a tunable range of 47.2 nm is demonstrated. The transmission peak wavelength can be tuned from 1524.9 to 1572.1 nm when the refractive index of the PDLC layer is varied by different applying voltages. More than 95% transmission efficiency can be achieved at the resonant wavelength, while the −3 dB bandwidth is about 1.6 nm. In addition, the resonant wavelength of the filter varies in a linear fashion with regard to the refractive index of the PDLC layer. Hence, a desired resonant wavelength can be selected easily by controlling the applied voltage.