Influence of the Position of the Connecting Spacer of the Chromophore on the Nonlinear Optical Response

Abstract

SummaryA new chromophore, C1, based on a similar DA-structure of the FTC-chromophore but with a hydroxyalkyl spacer perpendicular to the direction of the dipole moment was synthesized.Both chromophores and the CLD-chromophore were used to prepare high Tg nonlinear optical vinyl polymers. The influence of the position of the spacer on the DA-system on the nonlinear optical response of the resulting polymers was investigated.

Auxiliary donor for tetrahydroquinoline-containing nonlinear optical chromophores: enhanced electro-optical activity and thermal stability

“…13 39, 50.41, 30.86, 28.51, 26.47, 25.12, 24.34, 20.27, 13.90. The reaction was allowed to stir at 78 ºC for 5 h. The reaction mixture was cooled and green crystal precipitation was facilitated.…”

“…6,7 In general, the second-order NLO chromophore can be divided into three blocks: electro-donor, π-conjugated bridge and strong electro-acceptor, called D-π-A system. [11][12][13][14] Among all the materials studied, the NLO chromophores bearing 4-(dialkylamino)phenyl groups or triarylamine groups as a donating group were the most case due to their strong electrondonating ability and ease of synthesis. In the past decades, many studies on NLO chromophores have mainly focused on the design of electron bridges and electron acceptors, while the donor units have remained relatively unchanged.…”

Second harmonic generation in SiO2 sol–gel films functionalized with Ethyl-[4-(4-nitro-phenylazo)-phenyl]-(2-oxiranylmethoxy-ethyl)-amine (ENPMA) molecules

“…The quantitative determination of their d 33 (0) non-linear optical coefficient was carried out in-situ during the poling process by means of second harmonic generation (SHG) measurements, using the Maker fringe technique. Some recent results about promising poled materials considered for electro-optic applications have d 33 (0) values in the region between 1.2 and 16.6 pm/V [5,[8][9][10][11][12], thus the values obtained in our materials are high enough to be considered useful for potential electro-optic applications.…”

Synthesis and nonlinear optical properties of a cross-linkable system using sol-gel approach

“…Compared with inorganic materials (LiNbO 3 ), organic electro-optical polymers have many advantages such as high NLO susceptibility, low dielectric constant, fast response time and ease of material processing [1]. Lots of new chromophores with unique structures were synthesized, and E-O coefficients over 100 pm/V were reported recently [2,3]. For application, these high quality chromophores need suitable polymer backbones [4].…”