Phenoxysilicon polymer with stable second-order optical nonlinearity

Abstract

A new cross-linked second-order nonlinear optical material based on an alkoxysilane dye and a multifunctional phenoxyl molecule has been investigated. The design approach to this polymer system is also discussed. The nonlinear optical chromophore can be directly bound to an aryl-bridged network during the curing process. After cross-linking at 200 °C for 30 min, the cross-linked polymeric material was found to be amorphous with a Tt of 110 °C and a degradation temperature of 278 °C. The poled and cross-linked sample exhibits a second-order nonlinear optical coefficient, d33, of 77 pm/V. After being subjected to thermal treatment at 105 °C for 24 h, a reduction of only 19% of d33 was observed for the poled and cured sample. This d33 value remained unchanged at 105 °C for another 144 h, to which measurements were carried out. Detailed characteristics of the cross-linked material are discussed.Recently, a cross-linked system based on an alkoxysilane dye and phenylsiloxane polymer was reported.9 Upon

Dipolar relaxation in a second-order nonlinear optical interpenetrating polymer network

“…7 The second NLO network of a phenoxy-silicon polymer is based on an alkoxysilane dye (ASD) 17 of (3-glycidoxypropyl)trimethoxysilane and 4(4'-nitrophenylazo)aniline, and the multifunctional phenoxyl molecule 1,1,1 -tris (4-hydroxyphenyl)ethane (THPE). 9 The chemical structures of BPAZO, ASD, and THPE are shown in Figure 1. The IPN is formed simultaneously upon heating where the epoxy-based polymer network is formed through double reaction and the phenoxy-silicon polymer network is formed through sol-gel reaction.…”

Organically modified inorganic sol-gel materials for second-order nonlinear optics

“…In addition, the rigid aromatic ring also contributes to the suppression of the molecular motion for the PTEOS. 23 The poling effect on the absorption behavior of these NLO polymer films was measured by UVVis spectroscopy. The absorption spectra for the NLO polymer films before and after poling, and under thermal treatments at 100°C, are shown in Immediately after poling/curing, a decrease and a blue shift were observed in the spectrum, as a consequence of the dichroism and electrochromism that resulted from induced dipole alignment.…”

Preparation and characterization of all organic NLO sol-gel materials based on amino azobenzene dyes

“…[21] Similar phenomena have been reported for other crosslinked main-chain polymers. [22][23][24][25] Moreover, spectral red shifts were observed for the cross-linked side-chain polymer HM-DR1 and guest-host systems. This phenomenon also has been reported [26] in most side-chain polymers and guest-host systems.…”