TY - JOUR
T1 - Doping liquid crystal cells with photocurable monomer via holographic exposure to realize optical-scattering-free infrared phase modulators with fast response time
AU - Chien, Chun Yu
AU - Sheu, Chia Rong
N1 - Funding Information:
The authors would like to thank the Ministry of Science and Technology (MOST) for financially supporting this research under Grant No. MOST 104-2221-E-006-185-MY3.
PY - 2017/7
Y1 - 2017/7
N2 - Photocurable monomer-doped liquid crystal (LC) cells were processed via holographic exposure using a low-power He–Ne laser to generate holographic polymer networks. The polymer network LC (PNLC) cells are used to fabricate infrared phase modulators at 1550 nm wavelength possessing favorable electro-optical performance. Compared with our previous work, the percentages of ingredients in the LC mixture filled in PNLC cells underwent a slight change. The 2 wt% concentration of anisotropic monomer RM257 were in place of isotropic monomer N–vinyl–2–pyrrolidinone (NVP). As a result, the fabricated phase modulators also maintained well homogeneous LC alignments and optical-scattering-free characteristics. Furthermore, NVP dopant successfully reduced the operating voltages from 95 Vrms to 79 Vrms to prevent polymer network deformation when electrically operating with higher voltages. The fabricated infrared phase modulators had a good average response time (i.e., rising time of 0.88 ms and falling time of 0.40 ms).
AB - Photocurable monomer-doped liquid crystal (LC) cells were processed via holographic exposure using a low-power He–Ne laser to generate holographic polymer networks. The polymer network LC (PNLC) cells are used to fabricate infrared phase modulators at 1550 nm wavelength possessing favorable electro-optical performance. Compared with our previous work, the percentages of ingredients in the LC mixture filled in PNLC cells underwent a slight change. The 2 wt% concentration of anisotropic monomer RM257 were in place of isotropic monomer N–vinyl–2–pyrrolidinone (NVP). As a result, the fabricated phase modulators also maintained well homogeneous LC alignments and optical-scattering-free characteristics. Furthermore, NVP dopant successfully reduced the operating voltages from 95 Vrms to 79 Vrms to prevent polymer network deformation when electrically operating with higher voltages. The fabricated infrared phase modulators had a good average response time (i.e., rising time of 0.88 ms and falling time of 0.40 ms).
UR - http://www.scopus.com/inward/record.url?scp=85022040646&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85022040646&partnerID=8YFLogxK
U2 - 10.3390/cryst7070208
DO - 10.3390/cryst7070208
M3 - Article
AN - SCOPUS:85022040646
VL - 7
JO - Crystals
JF - Crystals
SN - 2073-4352
IS - 7
M1 - 208
ER -