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Dynamic manipulation of optical anisotropy of suspended Poly-3-hexylthiophene nanofibers
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
Vise andre og tillknytning
2016 (engelsk)Inngår i: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, Vol. 4, nr 10, s. 1651-1656Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Poly-3-hexylthiophene (P3HT) nanofibers are 1D crystalline semiconducting nanostructures, which are known for their application in photovoltaics. Due to the internal arrangement, P3HT nanofibers possess optical anisotropy, which can be enhanced on a macroscale if nanofibers are aligned. Alternating electric field, applied to a solution with dispersed nanofibers, causes their alignment and serves as a method to produce solid layers with ordered nanofibers. The transmission ellipsometry measurements demonstrate the dichroic absorption and birefringence of ordered nanofibers in a wide spectral range of 400–1700 nm. Moreover, the length of nanofibers has a crucial impact on their degree of alignment. Using electric birefringence technique, it is shown that external electric field applied to the solution with P3HT nanofibers can cause direct birefringence modulation. Dynamic alignment of dispersed nanofibers changes the refractive index of the solution and, therefore, the polarization of transmitted light. A reversible reorientation of nanofibers is organized by using a quadrupole configuration of poling electrodes. With further development, the described method can be used in the area of active optical fiber components, lab-on-chip or sensors. It also reveals the potential of 1D conducting polymeric structures as objects whose highly anisotropic properties can be implemented in electro-optical applications.​.

sted, utgiver, år, opplag, sider
2016. Vol. 4, nr 10, s. 1651-1656
Emneord [en]
anisotropic optical materials, electrooptical materials, nanofibers, optical properties, polymers, Anisotropy, Birefringence, Electric fields, Optical anisotropy, Optical fibers, Refractive index, Alternating electric field, Electric birefringence, Electro-optical applications, External electric field, Quadrupole configuration, Semiconducting nanostructures, Transmission ellipsometry
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Identifikatorer
URN: urn:nbn:se:ri:diva-27605DOI: 10.1002/adom.201600226Scopus ID: 2-s2.0-84979574389OAI: oai:DiVA.org:ri-27605DiVA, id: diva2:1059688
Tilgjengelig fra: 2016-12-22 Laget: 2016-12-21 Sist oppdatert: 2019-06-13bibliografisk kontrollert

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