Journal
LIQUID CRYSTALS
Volume 46, Issue 10, Pages 1544-1550Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2019.1587528
Keywords
colour tuning; chiral nematic; oblique helicoid; electrooptics; twist-bend nematic
Funding
- National Science Foundation [1410378]
- Kosciuszko Foundation
- Ministerstwo Nauki i Szkolnictwa Wyzszego [1644/MOB/V/2017/0]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1410378] Funding Source: National Science Foundation
Ask authors/readers for more resources
Oblique helicoidal cholesteric liquid crystals (Ch(OH)) offer an unprecedented opportunity to tune selective reflection of light in a broad spectral range from ultraviolet to infrared by an electric field. The major problem is that the temperature range of stable Ch(OH) is typically above the room temperature and is relatively narrow, a few degrees. In this work, we demonstrate that by using a mixture of flexible dimeric and rod-like molecules, one can significantly expand the temperature range of intense Bragg reflection, from 16 degrees C to 27 degrees C. We demonstrate that the selective reflection peak, reflection intensity, bandwidth and threshold electric field are all temperature dependent and discuss the associated mechanisms. The results show that both the electric field and temperature can be used to tune the structural colour of oblique helicoidal cholesteric structures. The proposed material can be used in switchable optical devices based on liquid crystals, such as light modulators, indoor smart windows, and filters. [GRAPHICS]
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available