Optimization and characterization of the guest-host polyetherketone polymer films for application in integrated optical devices

Abstract

In order to optimize the loading of 3-(1,1-dicyanothenyl)-1-phenyl-4, 5-dihydro-1H-pryazole (DCNP) in polyetherketone (PEK-c) guest-host polymer films, ten kinds of DCNP/PEK-c thin films, in which the weight per cent of DCNP changes from 5 to 50, were prepared. Their second-order nonlinear optical coefficients χ33(2) at λ = 1064 nm were measured by using Maker fringe method after poling under the optimal poling condition. Their optical waveguide transmission losses were measured at 632.8 nm. Optimal weight per cent of the chromophore for the DCNP/PEK-c guest-host polymer system has been determined as about 20 for use in the integrated optical devices.

Long‐Term‐Stable Strong Second Harmonic Generation in Flexible DAST−PVDF Composite Films Realized by the Interface Interactions

“…One can see that if the DAST concentration is lower than 2 wt%, the SHG intensity increases with the increase of the DAST www.advmatinterfaces.de concentration. But if the DAST concentration exceeds 2 wt%, the SHG intensity decreases abruptly, rather different from those previously observed in the guest-host azo-dye/PMMA polymer film [34] and DCNP/PEK-c polymer film, [35] where the SHG intensity increases monotonously with an increase of the concentration of the NLO chromophore in the polymer matrix. [34,35] This might be caused by phase mismatch, and thus the mutual cancellations or destructive interferences of the second harmonics appear in the composite films along the penetration path of the pump light.…”

“…But if the DAST concentration exceeds 2 wt%, the SHG intensity decreases abruptly, rather different from those previously observed in the guest-host azo-dye/PMMA polymer film [34] and DCNP/PEK-c polymer film, [35] where the SHG intensity increases monotonously with an increase of the concentration of the NLO chromophore in the polymer matrix. [34,35] This might be caused by phase mismatch, and thus the mutual cancellations or destructive interferences of the second harmonics appear in the composite films along the penetration path of the pump light. Close inspection of the SHG signals measured from the composite films with various DAST concentrations at normal incidence reveals that the strongest SHG intensity was measured in the 5 wt% DAST−PVDF films, quite distinct from the results measured at 45 o incidence (Figure 4a).…”

“…But the SHG intensity declines abruptly at higher poling temperatures (>100 °C), due to the strong aggregation of the DAST chromophores in the DAST−PVDF films, as observed by Shi et al in DCNP/PEK-c polymer films. [35] The SHG intensities of the composite films poled at different voltages were measured at room temperature after switching off the external electric field. Figure 5e indicates that the strongest SHG intensity was measured from the DAST−PVDF composite film poled at 2000 V, where the field strength of the composite film reached 2 MV•cm −1 .…”

Mobility of DR1 Molecules Embedded in Nanostructured PMMA Films

“…In a chromophores-containing polymeric film, the non-centrosymmetric order implies a nanoscale order of the permanent dipolar moment of chromophores along a preferential direction. This phenomenon is attractive for second order nonlinear optical applications [3][4][5]. In fact, by means of the SHG, it is possible to follow in situ the orientation of the chromophores embedded in the polymer [6,7].…”

Interferometric determination of the refractive indices and birefringence of some highly oriented fibres

“…Among all types of synthetic polymer fibres, the highly oriented fibres are of particular interest because of their unique properties and their wide range of applications such as integrated optical devices, which are presently a major focus of research in nonlinear optics [1]. These fibres have stress-strain curves showing a linear relationship indicating elastic behaviour over a very small extension [2].…”