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Optical Engineering

Third-order nonlinear optical properties of fluoro-containing polyimides embedded with H-shaped chromophores
Author(s): Mu Qin; Changshun Wang; Fuli Zhao; Pengfei Zeng; Peng Cai; Mingfeng Fang; Guoyuan Lu
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Paper Abstract

The third-order nonlinear optical (NLO) properties of a series of fluoro-containing polyimides embedded with H-shaped chromophores including two donor-π-acceptor units were investigated by employing the single-beam Z-scan technique in the femtosecond regime. A strong nonlinear refraction index n2 on the order of 1017  m2/W was acquired for the serial polymers at 810 nm laser pulses. The value of n2 was larger than that of the polymers with a corresponding mono donor-π-acceptor unit under the same laser excitation and negligible nonlinear absorption was observed in the two series of polymers at femtosecond pulse irradiation. The mechanism for the NLO response is discussed in terms of the molecular structure and dipole moment. We conclude that fluoro-containing polyimide polymers, with stronger electron-withdrawing substituents, embedded within H-shaped chromophores yield a noticeable improvement in the nonlinear refraction index. The figures of merit were evaluated for their potential applications in all-optical switching.

Paper Details

Date Published: 4 May 2015
PDF: 7 pages
Opt. Eng. 54(5) 057101 doi: 10.1117/1.OE.54.5.057101
Published in: Optical Engineering Volume 54, Issue 5
Show Author Affiliations
Mu Qin, Shanghai Jiao Tong Univ. (China)
Changshun Wang, Shanghai Jiao Tong Univ. (China)
Fuli Zhao, Shanghai Jiao Tong Univ. (China)
Pengfei Zeng, Shanghai Jiao Tong Univ. (China)
Peng Cai, Shanghai Jiao Tong Univ. (China)
Mingfeng Fang, Nanjing Forestry Univ. (China)
Guoyuan Lu, Nanjing Univ. (China)

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