High Optical Nonlinearity of Nematic Liquid Crystals Doped with Gold Nanoparticles

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• 作者：Nina Podoliak ; Dorota Bartczak ; Oleksandr Buchnev ; Antonios G. Kanaras ; Malgosia Kaczmarek
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：June 14, 2012
• 年：2012
• 卷：116
• 期：23
• 页码：12934-12939
• 全文大小：298K
• 年卷期：v.116,no.23(June 14, 2012)
• ISSN：1932-7455

文摘

Tetraoctylammonium bromide (TOAB)-coated gold nanoparticles dispersed in nematic liquid crystals lead to an enhancement of the nonlinear index coefficient, n₂. A small amount of particles is sufficient to increase n₂ and two-beam coupling gain by more than an order of magnitude while maintaining high optical quality and the ability of the suspensions to withstand strong applied electric fields. However, TOAB plays a crucial role in increasing the pretilt angle and reducing the anchoring strength, which leads to a stronger modulation of both the reorientation and the refractive index of liquid crystal suspensions.