Preparation of side-chain liquid crystalline Azopolymers by CuAAC postfunctionalization using bifunctional azides: Induction of chirality using circularly polarized light

2012 ◽  
Vol 50 (8) ◽  
pp. 1579-1590 ◽  
Author(s):  
Jorge Royes ◽  
Javier Rebolé ◽  
Laura Custardoy ◽  
Nélida Gimeno ◽  
Luis Oriol ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Polarized Light ◽  
Side Chain ◽  
Circularly Polarized Light ◽  
Circularly Polarized

Theory of Circularly Polarized Light Emission from Chiral Nematic Liquid Crystalline Films

1996 ◽  
Vol 425 ◽  
Author(s):  
H. Shi ◽  
S. H. Chen
Keyword(s):  
Experimental Data ◽  
Film Thickness ◽  
Liquid Crystalline ◽  
Light Emission ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Chiral Nematic ◽  
Polarized Emission ◽  
Crystalline Films

AbstractChiral nematic liquid crystalline films with fluorescent chromophores are capable of circularly polarized emission. A theory is presented in which the effects of anisotropic absorption and film thickness are accounted for. The predicted dissymmetry factor is compared with experimental data reported by Stegemeyer et al. and with the theory for the two limiting cases treated by Pollmann et al.

scholarly journals Strategies to Stabilize the Photoinduced Supramolecular Chirality in Azobenzene Liquid Crystalline Polymers

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 885 ◽  
Author(s):  
Jorge Royes ◽  
Luis Oriol ◽  
Rosa M. Tejedor ◽  
Milagros Piñol
Keyword(s):  
Block Copolymers ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Temporal Stability ◽  
Polarized Light ◽  
Thermal Characterization ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Crystalline Polymers ◽  
Supramolecular Chirality

This paper describes the synthesis, thermal characterization and optical properties of liquid crystalline homopolymers and block copolymers with a repeating unit consisting of two functional units, with at least one of them being an azobenzene. Films of these polymers have been irradiated with circularly polarized light at room temperature, evaluating the intensity of the photoinduced chiral signal and its temporal stability upon storage. The paper also explores two different strategies to restrict the relaxation of the photoinduced order. Firstly, block copolymers have been prepared to confine the photoaddressable segments into nanoscopic domains where relaxation should be restricted. Secondly, an alternative homopolymer has been synthesized where the repeating unit combines two chromophores that can be separately photoaddressed, an azobenzene unit to efficiently photoinduce chirality and a cinnamate to fix the chiral signal by photocrosslinking.

Control of Chirality of an Azobenzene Liquid Crystalline Polymer with Circularly Polarized Light

2000 ◽  
Vol 122 (51) ◽  
pp. 12646-12650 ◽  
Author(s):  
Gabriel Iftime ◽  
François Lagugné Labarthet ◽  
Almeria Natansohn ◽  
Paul Rochon
Keyword(s):  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Polarized Light ◽  
Crystalline Polymer ◽  
Circularly Polarized Light ◽  
Circularly Polarized

SECOND HARMONIC GENERATION UPON THERMAL POLING AND LIGHT-INDUCED CHIRALITY IN THE AMORPHOUS p(DR1M) AZOBENZENE POLYMER FILMS

2004 ◽  
Vol 13 (03n04) ◽  
pp. 427-431 ◽  
Author(s):  
V. RODRIGUEZ ◽  
F. ADAMIETZ ◽  
L. SANGUINET ◽  
TH. BUFFETEAU ◽  
C. SOURISSEAU
Keyword(s):  
Second Harmonic ◽  
Polarized Light ◽  
Optically Active ◽  
Side Chain ◽  
Circularly Polarized Light ◽  
Thermal Poling ◽  
Circularly Polarized ◽  
Crystal Polymer ◽  
Azobenzene Polymer ◽  
Poling Direction

We report experimental evidence for an efficient nonlinear optical polar ordering induced by wire poling under high field conditions in thin films of the amorphous p(DR1M) side-chain azobenzene homopolymer. Unusual enhancements of the absorption coefficient and d33 susceptibility along the poling direction are observed. Preliminary circular dichroism experiments have revealed the formation of a weak optically active supramolecular structure which becomes strongly active after irradiating the poled material with a circularly polarized light. Similar to a liquid-crystal polymer mesophase, it is thus possible to control the chirality in this efficiently poled amorphous achiral azobenzene polymer, in which circularly polarized irradiations with opposite handedness produce enantiomeric structures.

Chirality Induced by Circularly Polarized Light in Liquid Crystalline Twin Dimers with Azo Linkages

2007 ◽  
Vol 465 (1) ◽  
pp. 153-163 ◽  
Author(s):  
Yusuke Hoshino ◽  
Suk-Won Choi ◽  
Tatsuya Izumi ◽  
Yoichi Takanishi ◽  
Ken Ishikawa ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

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