Journal
LIQUID CRYSTALS
Volume 48, Issue 13, Pages 1806-1814Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2021.1900435
Keywords
Liquid crystal microlens array; negative-positive optical powers; low voltage; self-assembled polymeric convex array
Funding
- National Natural Science Foundation of China (NSFC) [61805066]
- China Postdoctoral Science Foundation [2019 M 652168]
- Research Funding for Postdoctoral Researchers in Anhui Province [2019B311]
- Zhejiang Provincial Natural Science Foundation [LQ20F050003]
Ask authors/readers for more resources
In this study, an LCMLA with a tunable focal length was designed using a self-assembled polymer convex array. By rotating the polarization direction of the incident light or changing the electric field, the focal length of the LCMLA can be continuously tuned from negative to positive.
In this report, an LCMLA with a negative-positive tunable focal length is designed using a self-assembled highly uniform polymer convex array. The polymer convex array was prepared by scribing UV-sensitive glue onto the indium tin oxide (ITO) substrate modified with a microhole array patterned hydrophobic layer. This substrate is assembled with another ITO substrate coated with a homogeneous polyimide alignment layer and rubbed in one direction, then filled with an LC material to form a sandwich structure. The refractive index of the selected polymer is kept between n(e) and n(o) of the LC materials. By rotating the polarisation direction of the incident light for 90 degrees, the focal length of the LCMLA can be switched from negative to positive. Otherwise, by varying the electric field, the continuous negative-to-positive tuning of the focal length of the LCMLA is implemented. For instance, an LCMLA with the aperture of 200 mu m and a fill factor of 82.2%, the cell gap is 20 mu m. Changing the voltage from 0 to 0.7 V-rms allows the focal length to be adjusted from -4 mm to infinity; in turn, varying the voltage from 1 to 10 V-rms results in the focal length from 6.0 to 4.5 mm.
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