Crosslinkable fluorinated hyperbranched polyimide for thermo‐optic switches with high thermal stability

Abstract

A series of fluorinated hyperbranched polyimides (FHBPIs) were synthesized by condensation of a triamine monomer, 1,3,5-tris(2-trifluoromethyl-4-minopheoxy) benzene (TFAPOB) and various aromatic dianhydride monomers with different linear length for application on integrated optical devices. Near infrared absorption measurement shows that it has high transparency in optical communication wavelength region. The glass transition temperature and thermal decomposition temperature were 189 C and 596 C, respectively. According to the atomic force microscopy analysis, the surface roughness of the FHBPI films is 0.208 nm. A classic Mach-Zehnder interferometer thermo-optic switch with single mode waveguide fabricated by FHBPIs represents excellent switching characteristic. The rise time and fall time of this device are 530 ms for both.

Effect of fluoro-polycarbonates containing aliphatic/aromatic segments on the characteristics of thermo-optic waveguide devices

“…Moreover, for Ar-PR 1-3, the absorbance values at 1550 nm increased with the increasing content of DOD in AF-Ar-PC EP 1-3 ( Fig. 3(A)(4)- (6) and (B)). This result was mainly due to the different contents of uorine (31.12 wt%, 30.03 wt%, and 28.16 wt% for AF-Ar-PC EP 1-3, respectively) since the absorbance values decreased with the decreasing content of F, which corresponds with the abovementioned conclusion.…”

“…5 Polymer materials have been intensively investigated due to their potential applications in optical waveguides because of their excellent characteristics 4 such as low optical loss, high extinction ratio, small cubage, easy integration, high thermal and environmental stability, and exible refractive index controllability. 6 Various organic polymers including polyimides, acrylic polymers, polycarbonates, polystyrenes, polysiloxanes, hyperbranched polymers, peruorinated methacrylates, and bis-phenol-A novolac resin (SU-8) have been tested as optical waveguide materials. 7 In general, glass and silicon wafers are selected as substrates for the fabrication of optical waveguides.…”

Fluorinated Linear Copolyimide Physically Crosslinked with Novel Fluorinated Hyperbranched Polyimide Containing Large Space Volumes for Enhanced Mechanical Properties and UV-Shielding Application

“…This structure brings more cavities to the matrix, which lays a foundation for use as gas separation materials [38]. Moreover, HBPI can be applied to the field of optics by modification of terminal functional groups [39,40]. However, it is this three-dimensional spherical structure that makes HBPI poor mechanical properties, due to the lack of physical entanglements between macromolecules.…”

Synthesis of Siloxane-polyimide Copolymer with Low Birefringence and Low Loss for Optical Waveguide

“…1,2 Several works have substantiated that replacement of C-H with C-F in polyimide reduced absorption at near infrared (NIR) telecommunication region. [3][4][5][6][7][8][9] Han et al worked on copolymerisation of different monomers especially in adding halogen group to improve optical properties for use as waveguide which exhibited low loss of less than 0.4 dB cm -1 at 1550 nm. 5 Meanwhile, a fluorinated polyurethane-imide as the core and SU-8 as the cladding displaying the radiation loss 1.5-1.7 dB cm -1 at 1550 nm has been designed.…”