Heat-resistant singlemode optical waveguides using fluorinated polyimides

Matsuura, Takeshi; Ando, Shinji; Matsui, Shinsuke; Sasaki, S.; Yamamoto, Fumio

doi:10.1049/el:19931409

Cited by 105 publications

(38 citation statements)

References 4 publications

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“…In recent years, with the demand of optical communication [6], liquid crystal display devices [7,8], transparent polyimides have become very important. Fluorinated polyimides synthesized from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropanedianhydride (6FDA) are known to be transparent and colorless, due to the bulky substituent group, -C(CF3)2-, which prevents the molecular packing and the formation of charge transfer [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Absorption and Fluorescence Spectra and Thermal Properties of Novel Transparent Polyimides.

Hone

Yokota

1997

J. Photopol. Sci. Technol.

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Ultraviolet-visible absorption spectra and fluorescence spectra of PI(6FDA/DCHM) and PI(6FDA/PDA) were investigated, as well as their thermal properties. Both PI(6FDA/DCHM) and PI(6FDA/PDA) showed high transparency in the visible region. Inter-and intra-molecular charge transfer were weakened by introducing fluorinated dianhydride, 6FDA, and I or alicyclic dicyclohexyldiamine, DCHM, in polyimide main chains. Excitation-wavelength dependence was found in the fluorescence spectra, which suggests inhomogeneous, less ordered aggregation in polyimide films including 6FDA or DCHM. Both PI(6FDA/DCHM) and PI(6FDA/PDA) had glass transition temperature, Tg of about 250°C from the TMA measurements, which proved that thermal stability of polyimides was not reduced by introducing the alicyclic group.

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Section: Introductionmentioning

confidence: 99%

Absorption and Fluorescence Spectra and Thermal Properties of Novel Transparent Polyimides.

Hone

Yokota

1997

J. Photopol. Sci. Technol.

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“…In addition, optically transparent PI films have many potential uses in electrooptical devices, flexible display substrates, and semiconductor applications. [10][11][12] Nanoscale composites of polymers with organoclays have been studied extensively. [13][14][15] Nanostructured materials often possess a combination of physical and mechanical properties not present in conventional polymer matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of colorless polyimide nanocomposite films containing pendant trifluoromethyl groups

2008

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A series of colorless polyimide (PI) nanocomposite films were synthesized from 2,2'-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl (TFDB) with various organoclay contents by solution intercalation polymerization to poly(amic acid)s, followed by thermal imidization. The variation with the organoclay content of the thermomechanical properties, morphology, and optical transparency of the hybrids was examined at organoclay loadings ranging from 0 to 1.0 wt%. The hybrid films showed high optical transparency and almost no color, with cut-off wavelengths ranging from 352 and 356 nm and very low b* values of 1.19-1.77. The hybrid PI films showed good thermal properties with a glass transition temperature of 280-287 o C. Most films did not show any significant thermal decomposition below 490 o C. The addition of only a small amount of organoclay was sufficient to improve the tensile properties of the PI films with maximum enhancement being observed at 0.25 wt% organoclay. Moreover, these PI hybrids also had low coefficients of thermal expansion (CTE).

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“…A number of research groups have used these direct methods to make waveguides on silicon, fused silica glass, or organic glass substrates. For example, polyimide is spin-coated on substrates followed by RIE to make ridge waveguides (5). Film thickness and refractive index are usually measured by m-line spectroscopy.…”

mentioning

confidence: 99%

Development of Polymer Optical Waveguides for Photonic Device Applications

Kaino

Yokohama

Tomaru

et al. 1997

ACS Symposium Series

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The development of nonlinear optical polymer waveguides directed toward practical photonic devices are discussed. Electro-optical polymer waveguides and third-Order nonlinear optical polymer waveguides have been fabricated and characterized as optical modulators and optical switches. To make the most of polymer processability, hybrid structures of waveguides are proposed since such structures are anticipated to advance optical signal processing technologies. This hybrid fabrication technique has the potential to develop waveguides for optical sampling element and compact Kerr shutter switch applications.There is a growing interest in the processing of information with optical devices for application in optical telecommunication systems. Optical signal transmission and processing require optical interconnection technology designed to overcome bottlenecks resulting from high circuit densities for high data transmission and processing rates from increased data quantities. These kinds of photonic devices have already attracted considerable attention as key elements in optical signal processing systems.For device applications, waveguide structures can be effective for controlling optical signals with low power. Polymer waveguides offer the potential to create highly complex integrated optical devices and optical interconnects on a planar substrate because their excellent optical properties can be tailored by using different types of polymers(i). Optical processing requires highly nonlinear optical (NLO) materials to 30

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Heat-resistant singlemode optical waveguides using fluorinated polyimides

Cited by 105 publications

References 4 publications

Absorption and Fluorescence Spectra and Thermal Properties of Novel Transparent Polyimides.

Absorption and Fluorescence Spectra and Thermal Properties of Novel Transparent Polyimides.

Synthesis and characterization of colorless polyimide nanocomposite films containing pendant trifluoromethyl groups

Development of Polymer Optical Waveguides for Photonic Device Applications

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