Preparation, thermo‐optic property and transmission loss of chiral azobenzene polyurethane

Abstract

A novel chiral azobenzene polyurethane (CAPU) was prepared from chromophore, chiral reagent L(À)-tartaric acid and toluene diisocyanate (TDI). The chemical structure and the thermal property were characterized by UV-Vis spectrum, FT-IR, 1 H NMR, circular dichroism (CD) spectrum, differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). DSC and TGA experiments showed that the glass transition temperature (T g ) and the decomposition temperature (T d ) at 5% mass loss were 110 C and 199 C, respectively. The refractive index (n) and thermo-optic coefficient (dn/dT) of the CAPU were measured at 650 nm wavelength and different temperature by attenuated total reflection (ATR) technique. By using CCD digital imaging devices, transmission loss of CAPU was measured and the value is 0.565dB/cm. The results will provide the foundation for many potential applications such as digital thermo-optic switch materials and other fields in the future.

Preparation, optical properties and 1 × 2 polymeric thermo-optic switch of polyurethane-urea

“…[13,14]. It is well known that the refractive index (n) dependence of temperature gives a thermo-optic coefficient (dn/dT or TOC) for waveguide material.…”

Synthesis and characterization of thioether-containing polyimides with high refractive indices

“…In this paper, we utilized a prism coupler instrument madein-house to measure the refractive indices of the resulting PI films by the ATR method. It is well known that the ATR method is often used to measure the refractive indices of polymer films, and that its measurement sensitivity is <10 −3 [29][30][31][49][50][51][52][53][54][55]. In order to determine the accuracy of our instrument, the PI (Ref-PI-a) made from PMDA and ODAwas selected as a standard material.…”

“…The size of each film sample was (50×10×0.05) mm 3 . The refractive indices of the polyimides were measured by the attenuated total reflection (ATR) technique [29][30][31]. A schematic diagram of the instrument used is shown in Fig.…”

Preparation of Waveguide Polymer and its Simulation Study of Thermo-Optic Switch at the Infrared Communication Wavelength 1.55 μm

“…Measurements of refractive indices were preformed using attenuated total reflection (ATR) technique [18][19][20]. The dielectric planar waveguide is a three-tier, in the substrate and cover layer is the waveguide layer.…”