1991
DOI: 10.1002/marc.1991.030121210
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Laser‐induced birefringence in homeotropic films of photochromic comb‐shaped liquid‐crystalline copolymers with azobenzene moieties at different temperatures

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Cited by 101 publications
(50 citation statements)
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“…Azobenzene polymers are potentially useful as materials for reversible holographic information storage and photonic devices. [94][95][96][97][98] Surface relief grating (SRG, regular topological surface modification) formed via the irradiation with an interference pattern of coherent light has been demonstrated recently [99][100][101] and is perhaps the most attracting target in the current research of Az polymers. A great deal of data has been accumulated rapidly due to its basic phenomenological interest [102][103][104][105][106][107][108] and to attractive technological applications.…”
Section: Photo-triggered Instant Mass Migrationmentioning
confidence: 99%
“…Azobenzene polymers are potentially useful as materials for reversible holographic information storage and photonic devices. [94][95][96][97][98] Surface relief grating (SRG, regular topological surface modification) formed via the irradiation with an interference pattern of coherent light has been demonstrated recently [99][100][101] and is perhaps the most attracting target in the current research of Az polymers. A great deal of data has been accumulated rapidly due to its basic phenomenological interest [102][103][104][105][106][107][108] and to attractive technological applications.…”
Section: Photo-triggered Instant Mass Migrationmentioning
confidence: 99%
“…We have used LC comb-shaped polyacrylic and polymethacrylic copolymers with different chemical natures and lengths of the spacer containing varied concentrations of chemically-attached azo dye molecules [16,[81][82][83][84][107][108][109][110][111][112]. Depending on the chemical structure of the spacer and the ratio between the mesogenic and the dye-containing units these copolymers could exist in the amorphous or the LC state [108][109][110][111][112].…”
Section: And 23)mentioning
confidence: 99%
“…Zur Verbesserung der Stabilität können hohe Glasübergangstemperaturen der Matrix, ein geeignetes Comonomerdesign, kurze SpacerEinheiten sowie eine in ihrer Stärke sehr genau eingestellte Flüssigkristallinität, die ein orientierungsstabiles amorphisiertes PAP bei Raumtemperatur zulässt, vorteilhaft sein. [108,109,128] Zusätzlich zur ¾nderung der Absorptionseigenschaften können damit auch Veränderungen der Viskosität, des Löslichkeitsverhaltens, der mechanischen Eigenschaften, der Oberflächenenergie, des Bewitterungsverhaltens und weiterer Parameter des photoadressierbaren Polymers verbunden sein. [111,[129][130][131][132][133][134][135][136] Die Wiederbeschreibbarkeit des Materials wird durch eine Belichtung mit circular polarisiertem Licht erreicht, wodurch die anisotrop ausgerichteten Azobenzoleinheiten über einen erneuten trans-cis-trans-Isomerisierungszyklus [137] Dennoch ist das vollständige Löschen aller Daten kein trivialer Schritt und in der Praxis zumeist nicht zu erreichen.…”
Section: Photochrome Und Andereunclassified