Dejan Bošnjaković (Avtor), Mathias Fleisch (Avtor), Xinzheng Zhang (Avtor), Irena Drevenšek Olenik (Avtor)

Povzetek

We present an experimental and theoretical investigation of the optical diffractive properties of electrically tuneable optical transmission gratings assembled as stacks of periodic slices from a conventional nematic liquid crystal (E7) and a standard photoresist polymer (SU-8). The external electric field causes a twist-type reorientation of the LC molecules toward a perpendicular direction with respect to initial orientation. The associated field-induced modification of the director field is determined numerically and analytically by minimization of the Landau–de Gennes free energy. The optical diffraction properties of the associated periodically modulated structure are calculated numerically on the basis of rigorous coupled-wave analysis (RCWA). A comparison of experimental and theoretical results suggests that polymer slices provoke planar surface anchoring of the LC molecules with the inhomogeneous surface anchoring energy varying in the range 5–20 µJ/m$^2$. The investigated structures provide a versatile approach to fabricating LC-polymer-based electrically tuneable diffractive optical elements (DOEs).

Ključne besede

polimeri;nematski tekoči kristali;lasersko mikrostrukturiranje;optika;uklonske mrežice;polymers;nematic liquid crystals;laser micro structuring;optics;diffraction gratings;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UL FMF - Fakulteta za matematiko in fiziko
UDK: 535.421
COBISS: 71504131 Povezava se bo odprla v novem oknu
ISSN: 2073-4360
Št. ogledov: 62
Št. prenosov: 24
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: polimeri;nematski tekoči kristali;lasersko mikrostrukturiranje;optika;uklonske mrežice;
Vrsta dela (COBISS): Članek v reviji
Strani: 17 str.
Letnik: ǂVol. ǂ13
Zvezek: ǂart. no. ǂ2292
Čas izdaje: Jul. 2021
DOI: 10.3390/polym13142292
ID: 18209044