TY - JOUR
T1 - All-optically controllable photonic crystals based on chiral-azobenzene-doped blue phase liquid crystals
AU - Jiang, Shun An
AU - Wu, Chan Hong
AU - Mo, Ting Shan
AU - Huang, Shuan Yu
AU - Lin, Jia De
AU - Lee, Chia Rong
N1 - Funding Information:
alls-iogpntiifcicaallnytlcyo nwtridolelredthaamn othnagtBoPfIa, BnPoInI,aalingdneisdo straomppiclep. hTahsee hvioamthoegerenveeorussiblyle atlrigannse–dc iCsAan-BdPcLisC–tcraann sbe baaclkl-oispotmicaelrliyz actoinontrsoollfedth aemCoAngd oBpPaI,n BtsPuIIn, adnedr tihsoetsruopccicespshivaeseil vluiam tihnea rteiovnerosfiblilgeh trtasnosu–rcciess awndit hciss–htorratns anbdaclokn igsowmaevreizleantigotnhss .oTfhtheeo CpAtic dalolyparnevtse rusnibdleerc tohnet rsoulcocefstshievealiilglunmedinCaAti-oBnP oLfC liigshrte spoeuartacebsle w. Oithnsthhoert coanntdra lroyn, gth weanvoenleanliggtnhesd. TChAe -oBpPtLicCallcye lrlesvheorswibslea cwonidtreorlw ofa vtheele anlgigtnhetdunCaAb-iBliPtyLCin irserfelepcetaiotanbblee.c Oaunstehe ofctohnetrwareya,k thseu rnfoancealaignncehdo rC. AT-hBiPs LstCu dceyllaslhsoowprso av widiedsear wbaasvieslefonrgdthestuignnaibniglitvya irnio ruesfleacptpiolnic abteicoanussoe fof cotnhter owllaeabkle spuhrofatocenicandcehvoicr.e sT,hsuisc hstausdoyp atilcsaol lpyrsowviidtcehsaba lebaasnids tfuonradbelseigBnPiLnCg gvraartiionugss ,alpaspelricsa,tfiioltnerss ,of ancdonmtriorrlolarbs.le photonic devices, such as optically switchable and tunable BPLC gratings, lasers, filters, and mirrors. Supplementary Materials: The following are available online at http://www.mdpi.com/2073-4352/10/10/906/s1, Figure S1: (a) Chemical structure of the chiral azobenzene Chad-2-S and (b) variation of its absorption spectrum Supplementary Materials: The following are available online at www.mdpi.com/xxx/s1, F2 igure S1: (a) Chemical (solved in THF with 0.1 wt%) measured during the UV irradiation of 300 µW/cm for 2 minutes. Figure S2: structure of the chiral azobenzene Chad-2-S and (b) variation of its absorption spectrum (solved in THF with 0.1 Experimental setup for optically controlling the CA-BPLC samples.2 P1 and P2 both are polarizers, which are set wt%) measured during the UV irradiation of 300 μW/cm for 2 minutes. Figure S2: Experimental setup for anodp(tbic)anlloyn c-aolnigtrnoeldlinCgA t-hBeP LCCA-sBaPmLpCle ssammepalseusr.ePd1a atnvdar Pio2u sbotethmpareer aptuorlaersizinercso, owlinhgic.hF aigrue rseeSt 4c:roRs-sPeOdM. BiSmaangde sM ofrneporne-saelingtn beedamCAsp-BliPttLeCr asnadm mpilrersowr, irtehspveacrtiiovueslyc.o Fnicgeunrter aSt3i:o RnesfloefcCtioAn dspopecatnrats o(f1(,a2).a5l,igannded5 awndt% (b))dnuornin-aglitghneed CA-BPLC samples measured at various temperatures in cooling. Figure S4: R-POM images of non-aligned CA-AuBtPhLoCr Csaomntprliebsu wtioitnhs v: aSr.i-oAu.Js. ccoonncceenivteradtitohnesi doefaC; AS. -dAo.Jp.aanntds (C1.,- H2.5.W, a.npde r5fo wrmt%e)d dthuerienxgp tehreim ilelunmts;inJ.a-Dtio.Ln. ,oTf.-4S0.5M n.,m anldasCer..-R.L. analyzed the data through detailed discussion; S.-A.J., J.-D.L., and C.-R.L. wrote the draft; C.-R.L. supervised the project. S.-Y.H. provided resources and useful ideas for this research. All authors have read and Author Contributions: S.-A.J. conceived the idea; S.-A.J. and C.-H.W. performed the experiments; J.-D.L., T-S.M., and C.-R.L. analyzed the data through detailed discussion; S.-A.J., J.-D.L., and C.-R.L. wrote the draft; C.-Funding: This research was funded by Ministry of Science and Technology, Taiwan (Contract numbers: MOST R.L. supervised the project. S.-Y. H. provided resources and useful ideas for this research.
Funding Information:
This research was funded by Ministry of Science and Technology, Taiwan (Contract numbers: MOST 109-2221-E-006-208-MY3 and MOST 109-2112-M-006-014-MY3). The authors would like to thank the Ministry of Science and Technology, Taiwan (Contract numbers: MOST 109-2221-E-006-208-MY3 and MOST 109-2112-M-006-014-MY3) for financially supporting this research.
Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2020/10
Y1 - 2020/10
N2 - In this study, the all-optical control properties of photonic crystals based on self-assembled chiral-azobenzene-doped blue phase liquid crystals (CA-BPLCs) were investigated. The difference in the photothermal characteristics of CA-BPLCs with and without homogeneous surface alignment was discussed. Results revealed that surface alignment could induce more uniform and diverse blue phase (BP) structures, including BPII, BPI, and BPS-like phases during cooling. Consequently, the temperature range of BP was wider than that of the sample without surface alignment. All-optical control experiments with light illumination were then performed on the aligned or nonaligned CA-BPLC samples. During continuous irradiation with light beams at wavelengths of 405 and 450 nm, CA dopants underwent trans→cis and cis→trans back photoisomerizations, respectively. These processes promoted isothermal phase transition and wavelength shifting, which further enabled the all-optical control of the CA-BPLC samples. Various optical control modes of BPLC could be achieved through phase change and wavelength shifting by appropriately selecting the working temperature and surface treatment of BPLC. This study could be further used as a basis for developing photoswitchable and tunable BPLC photonic devices, such as light-controllable gratings, filters, mirrors, and lasers.
AB - In this study, the all-optical control properties of photonic crystals based on self-assembled chiral-azobenzene-doped blue phase liquid crystals (CA-BPLCs) were investigated. The difference in the photothermal characteristics of CA-BPLCs with and without homogeneous surface alignment was discussed. Results revealed that surface alignment could induce more uniform and diverse blue phase (BP) structures, including BPII, BPI, and BPS-like phases during cooling. Consequently, the temperature range of BP was wider than that of the sample without surface alignment. All-optical control experiments with light illumination were then performed on the aligned or nonaligned CA-BPLC samples. During continuous irradiation with light beams at wavelengths of 405 and 450 nm, CA dopants underwent trans→cis and cis→trans back photoisomerizations, respectively. These processes promoted isothermal phase transition and wavelength shifting, which further enabled the all-optical control of the CA-BPLC samples. Various optical control modes of BPLC could be achieved through phase change and wavelength shifting by appropriately selecting the working temperature and surface treatment of BPLC. This study could be further used as a basis for developing photoswitchable and tunable BPLC photonic devices, such as light-controllable gratings, filters, mirrors, and lasers.
UR - http://www.scopus.com/inward/record.url?scp=85092236373&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85092236373&partnerID=8YFLogxK
U2 - 10.3390/cryst10100906
DO - 10.3390/cryst10100906
M3 - Article
AN - SCOPUS:85092236373
SN - 2073-4352
VL - 10
SP - 1
EP - 11
JO - Crystals
JF - Crystals
IS - 10
M1 - 906
ER -