Study on the synthesis and optical properties of polyurethane-imide

In this paper, Polyurethane-imide (PUI) which has the advantages of polyurethane and polyimide is synthesized and introduced to apply in the slab optical waveguide devices. The PUI is characterized by infrared spectrum (FT-IR), differential scanning calorimeter (DSC) and thermal gravimetric analysis (TGA). Slab optical waveguide is prepared via spin coating the cyclopentanone solution of PUI on top of K9 glass and cured at 140 °C for 20 minutes to complete removal of the solvent from the film. The film-formability of PUI is characterized by atomic force microscope (AFM). The results of DSC and TGA indicate that the PUI exhibits high thermal stability up to its glass-transition temperature (Tg) of 206 °C and 10% heat loss temperature of 310°C. Optical properties of absorption behavior and propagation loss are investigated in slab waveguides, and propagation loss of 1.782 dB/cm at 1310nm in TE (transverse electric field) mode has been achieved by using prism-coupler method. The results show that polyurethane-imide has distinct merits: good processability, high thermal stability and moderate glass-transition temperature, excellent film-formability, and low propagation loss. These advantages of polyurethane-imides make them suitable as electro-optic polymeric materials in integrated optics.

[1]  A. Jen,et al.  A side-chain dendronized nonlinear optical polyimide with large and thermally stable electrooptic activity , 2004 .

[2]  A. Jen,et al.  Design and synthesis of chromophores and polymers for electro-optic and photorefractive applications , 1997, Nature.

[3]  J. Ju,et al.  Nonlinear optical polyimides with various substituents on chromophores: synthesis and glass transition temperature , 2004 .

[4]  Xiaoqiang Sun,et al.  Fabrication of a polymer CPW electro‐optic modulator using a strip‐loaded waveguide structure , 2009 .

[5]  A. Yeniay,et al.  Ultra-low-loss polymer waveguides , 2003, Journal of Lightwave Technology.

[6]  Synthesis and optical nonlinearity of thermally stable polyimides incorporated with electro-optic chromophore as side chain , 2007 .

[7]  Larry R. Dalton,et al.  Nonlinear Optical Polymeric Materials: From Chromophore Design to Commercial Applications , 2002 .

[8]  Suntak Park,et al.  Electro-optic materials: hyperbranched chromophores attached linear polyimide and dendritic polyesters , 2005 .

[9]  Huey-Ling Chang,et al.  Thermally stable NLO poly(amide–imide)s via sequential self-repetitive reaction , 2007 .

[10]  F. Diederich,et al.  All-optical high-speed signal processing with silicon–organic hybrid slot waveguides , 2009 .

[11]  Wolfgang Freude,et al.  High-speed low-voltage electro-optic modulator with a polymer-infiltrated silicon photonic crystal waveguide. , 2008, Optics express.

[12]  S. Haxha,et al.  Ultra-High-Speed Deeply Etched Electrooptic Polymer Modulator , 2008, IEEE Journal of Quantum Electronics.

[13]  Larry R. Dalton,et al.  Nonlinear polymer-clad silicon slot waveguide modulator with a half wave voltage of 0.25 V , 2008 .

[14]  L. Men,et al.  Cross-Linkable Zwitterionic Polyimides with High Electrooptic Coefficients at Telecommunication Wavelengths , 2004 .

[15]  R. Jeng,et al.  Nonlinear optical polyimide/montmorillonite nanocomposites consisting of azobenzene dyes , 2008 .