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Proceedings Paper

Novel nonlinear optical material with poly(3-hexylthiophene) thin film prepared on quartz glass surface modified by self-assembled monolayer
Author(s): Shizuyasu Ochiai; Suguru Mototani; Jayaraman Ramajothi; Kenzo Kojima; Teruyoshi Mizutani
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Paper Abstract

The third-order nonlinear optical properties of regioregular poly(3-hexylthiophene) (RR-P3HT) thin films prepared on fused glass substrate were evaluated. The surface modification by hexamethyldisilazane (HMDS) and octadecyltrichlorosilane (ODTS) was performed on the glass substrate to form self-assembled monolayer (SAM) layers. The formation of SAM layers on the glass substrate increase the contact angle of the solution and the optical property of the RR-P3HT thin films is enhanced due to the excellent orientation and alignment of the thin film. The π-conjugated macromolecule thin films can be prepared by spin-coating and drop-casting methods and the structure and orientation alignment of thin films can be controlled by the solution processing and deposition techniques. The nonlinear optical property, third-harmonic generation of RR-P3HT thin films has been evaluated by Maker-fringe method. The third-order nonlinear optical susceptibilities χ(3) (-3ω; ω, ω, ω) of drop-cast RR-P3HT thin films on quartz glass substrate were estimated from optical third-harmonics (TH) intensity measurement. An Nd:YAG laser with a wavelength of 1064 nm, pulse width of 5 ns and a repetition frequency of 10 Hz was used to evaluate the TH intensity. The effect of surface modification of quartz glass substrate by HMDS and ODTS on the RR-P3HT film structure was also investigated. The orientation alignment and crystallinity of the RR-P3HT thin films were evaluated using X-ray diffraction (XRD) and UV-vis absorption spectra. The UV-vis and XRD profile reveals the better orientation and crystallinity of the RR-P3HT thin film after surface modification by HMDS and ODTS. Moreover the incident angle dependences of third harmonic (TH) intensity was measured and the TH intensity of RR-P3HT thin film prepared on glass substrate with SAM layer was found to higher than that of non-treated substrate. The SAM layers significantly enhances the optical property of the material and the third-order nonlinear optical susceptibility (χ(3)) of RR-P3HT thin films on quartz glass surface modified by ODTS is 1.90 × 10-8 esu. The third-order nonlinear optical susceptibility (χ(3)) of RR-P3HT thin film was found to higher than poly(p-phenylenevinylene) (PPV).

Paper Details

Date Published: 2 September 2008
PDF: 8 pages
Proc. SPIE 7049, Linear and Nonlinear Optics of Organic Materials VIII, 70490S (2 September 2008); doi: 10.1117/12.792978
Show Author Affiliations
Shizuyasu Ochiai, Aichi Institute of Technology (Japan)
Suguru Mototani, Aichi Institute of Technology (Japan)
Jayaraman Ramajothi, Aichi Institute of Technology (Japan)
Kenzo Kojima, Aichi Institute of Technology (Japan)
Teruyoshi Mizutani, Aichi Institute of Technology (Japan)


Published in SPIE Proceedings Vol. 7049:
Linear and Nonlinear Optics of Organic Materials VIII
Rachel Jakubiak, Editor(s)

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